Sunken Honda WX10 Engine Restoration Rebuild Part 3

In this video we assemble the Honda WX10 pump but not all is well. Let me know your opinion in the comments section. No guesswork please only facts. It actually has a GX31 engine.
The second piston I have been supplied is from a GX35 and although it is 39mm, it has a depression in the centre of the piston and the original didn't. To my way of thinking, this will lower the compression.
Adding to the problems, I can't find the procedure for the valve timing anywhere and only have two 2 videos below but they both say opposite things.
We have a good spark and a new Carb as well but no firing. Its going to have to go to Part 4 i'm afraid so if you have any ideas on the piston and the valve timing, let me know.
#hondagx31 #hondawx10 #hondagx35
Video with the cam lobe pointing down • Honda gx31
Video with the cam lobe pointing up • เครื่องตัดหญ้า4จังหวะ ...
WHICH ONE IS CORRECT ???
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[@TechGorilla1987]

I absolutely cannot stress enough how very REFRESHING it is to get such GREAT content without all of the loud music, crapping intros or extraneous narration. I love to hear the tools do the job that they are being employed to do.

[@treynathaniel4075]

Ya know, if it wasn't a honda none of this would be possible xD. You're an artist my friend.

[@ionracer24]

Now i know why it was at the bottom of a lake....

[@TheIrishBosnian]

😂❤️

[@neilfroggycrompton2466]

Sleeping with daa fishes 😅😅😅😆😆

[@btf2842]

Just remove the recoil and turn it with a drill, for intial startup testing to make your life just that little bit easier.

[@byrontaylor9235]

Yeah i had a craftsman mower with a weedeater type head on it the pull cord broke and i used my hammer drill to start it its alot easier and starts it faster and better and quicker that way

[@btf2842]

@@byrontaylor9235 just be careful when it does fire up cuz if you cant get the drill off quick enough it can unscrew your flywheel nut!

[@byrontaylor9235]

@@btf2842 yeah i know once it fires you got to pull the drill quick i got good at it lol and liked it better than the cord but yeah if you dont pay attention it can bite ya

[@adrianbadea1179]

This is how I star my Bush trimmer 👆😏😁

[@jebsails2837]

Frustration is the name of the game. Another KZbin poster to try is Bruce Pender. Has number of videos on Honda small engines. Thanks for sharing, we learn even when we fail. Narragansett Bay.

[@Knaeckebrotsaege]

Don't forget "mustie1". Does lots of aircooled VW stuff but also resurrects a ton of small engine stuff, from puch mopeds to piaggio scooters and honda motorcycles, lawnmowers, generators... the whole lot. If any of his videos have "will it run" in the title or thumbnail, the answer is yes in 99% of the cases :D

[@professionalidiots101]

Martin, I will look to see if I have the original Honda build/service manual for that engine. The slightly larger engine's have a decompression mechanism built on the crank, to temporarily lift the exhaust valve, (memory is grey like my hair lol) to aid starting. Great video, you are a wizard Martin, and it will work........ Soooon 😀

[@yellownp22541]

To say that you did an OUTSTANDING job is simply not enough. You are awesome.

[@majesticenglish2637]

love the videos especially the rebuild,so satisfying to watch...when i was a teenager an had my yamaha 50cc..i used to tinker around with it..removing head polishing the piston cleaning what i could..upgrading reeds an jets in the carb....exhaust port.derestricting...it did make a difference..fastest 50cc on the block..haha..im subbed!

[@RetroHax]

Yes, I did the same with my fs1e

[@Miata822]

So many fix-it videos on KZbin make mechanicing look easy, It isn't. Glad to finally see that. Earns you a thumbs up :)

[@RetroHax]

Thanks Bill

[@Brian-vc1oy]

I'm sure you will be able to figure it out! Great series so far 👍👍👍

[@ao2528]

Fantastic restoration, look like a brand new one, I think that piston can build enough pressure for firing, may be non original ones makes the engine weaker or some kind of bad firing, if you have spark and fuel then the source of problem must be the timing or valves as you mentioned, we are waiting to see that nice engine running as it should.

[@Madlintelf]

I know it's frustrating putting in so much time and it still not working but reading the comments you'll be getting some great ideas and hopefully in part 4 you can celebrate it working. Been enjoying every episode and I'd love to know the total number of man hours you put into this once it's complete. Thanks for your patience, great content, and never giving up!

[@RetroHax]

Thanks William.

[@koltonshampine5441]

If its puffing out the intake your cam timing is too delayed put the cam at tdc and time it to power with the upcoming lobe being exaust

[@bogdanbacanu605]

this

[@guataco]

You are a Master of patience. Retrohax Lama 🙇🏽‍♂️👍

[@alexandruanghel4295]

Nooooooo I was waiting for it to start. Great job , but I wanted it to start you put so much work in it.

[@Mark...]

Excellent work 👍 just shows what the right tools and the proper knowledge can do.

[@chrisross-smith4358]

Great job Martin,as usual. I really thought that engine was never coming back to life. Incredible work. I'm sorry I cannot help you with starting it, but I know you will figure it out. Can't wait for ep 4. Cheers, Chris.

[@StefanDembowski]

Well worth a part 4, IMO....

[@remyaworld1]

I really hope you'll make it run. You put so much work and effort in this motor. Would be a shame if it would not get a second chance in life. Really like your work. Thanks.

[@RetroHax]

Thanks bud. I hope so too.

[@clauslundberg9224]

Love this series - and its (guess British) honesty - cant wait for part 4

[@chrislogan8283]

makes my night when Retrohax pops up in notifications as long as you make vids i'll watch them

[@turbinepower77]

Did you hone the cylinder? It was in pretty bad shape.

[@ianclinthorne9968]

These revival series you do are awesome I'd love to see a chainsaw on your bench someday your a true craftsman. 👍👍

[@antoninocappai7122]

hello, I did the same job with an oleomac pump, the compression was excellent, the problem was in the carburetor and in any case for the first ignition test to remove the air filter and spray a little spray Start. congratulations great job greetings from Sardinia, Italy

[@RetroHax]

Already did that in the video bud and its a brand new carb.

[@shawnmrfixitlee6478]

I was under the impression it was a GX35 , I will look and see if I have a book on the GX31 ..ENJOYED !

[@alexanderwingeskog758]

Awesome! This 4-stroke 35cc is more efficient less weight and not (really today) more complex then my 50cc moped in the 80's. It's cute! :-)

[@fernandosalas8589]

O man all that super hard work and no joy 😖.

[@randymcdonald1419]

Keep on truckin at it. It has to run.

[@pauls466]

You make the best videos on 'haw to' . Brilliant Sir! thanks

[@georgeharper3546]

Really unlucky that it doesn't work, especially as it looks brand new now! I was rooting for you at the end especially at the end when it puffed at the intake! Hope you get it fixed, I can't wait for part 4 :) Keep up the great content Martin!

[@69virgin1966]

It appears that you did all that work for nothing, but I have no doubt that in the end you will get it running. Thanks for sharing and God bless

[@MrNacho1946]

It's too bad that it didn't start but you did a good job and I entertained myself very much. Thank you.

[@davidcranston1262]

Great video. I would say it’s the piston, altering the combustion chamber.

[@meraioanvasile3635]

I was so hoping to see that little thing run.... love the videos so satisfying

[@waynewright9853]

Great job didnt think it would come back that well.

[@SCOTTISHPREPPERVARIETYCHANNEL]

WOW now heres what you can achieve with some fore sight and skill what a great sereis again martin very very enjoyable and what turn around from someone junk!!!! no more in your hands saved it

[@RetroHax]

Hope to get it sorted in the next vid Chris.

[@LMF5000]

Great series, I really love restorations. If I could make one suggestion, I wish you'd included footage of you removing the old piston and fitting the new one, I can't figure out how on earth you'd seperate the connecting rod from the crankshaft since it has no bolts on the big end, lol.

[@AW-Services]

You may consider overwinding your recoil spring in the pull start and spraying silicone grease around the inner of housing

[@kojack57]

Wait, that doesn't happen on tv. It always works. Very cool work. I have no explanation but really enjoyed watching. That's a lot of work for something that was in a river and a prime example of why we differ from Women. I'll sub so I can see part 4.

[@RetroHax]

Nice one. Thanks.

[@Jeffm005]

Good video Martin. I like the way you do not have any annoying music.

[@williamwebster213]

cool looking little motor

[@vwcol..7719]

Looks great Martin your nearly there I can imagine theres been a few choice words 🤣 looking forward to the next one👍

[@RetroHax]

Yes there has Col haha

[@jonathanmeert3455]

cam needs to be pointed down, you can see smoke out of the intake as you pull the cord at the end of the video (flipped 180 degrees)

[@Hoggdoc1946]

Exactly my thoughts anytime you are seeing compression come out the cark like that indicated cam/valve timing is off.

[@jeffr0]

Can’t help on this one Martin, but somebody has the answer.

[@boondocker7964]

We will be looking forward to part 4. See you soon, I hope.

[@sheep1ewe]

Beautiful job!

[@chrishoughton510]

Great video Martin, fingers crossed you get it started in part 4, im used to fiddling with 2 stroke engines so im none the wiser im afraid ☹👍👍

[@RetroHax]

Just need to know the valve timing settings Chris, can't find that info anywhere.

[@aga5897]

Cool videos ! If it's puffing outta the intake, no-brainer that the Intake Valve is Open when it should be shut = timing. 4-stroke Sequence :- 1. Piston at (or near) TDC, both valves must be shut, explosion, power. Piston goes down. 2. Piston goes up, exhaust valve is open, all gasses go out the exhaust. 3. Piston goes down, exhaust valve closed, carb valve open. Fuel/air get sucked in from the carburetor. 4. Piston starts to go up, both valves closed, compressing that mixture.

[@RetroHax]

Come on bud. I know all that.

[@aga5897]

It would have been good if you'd included that in the video, as not everyone watching would know.

[@scottpowell6145]

I ADMIRE YOUR WORK

[@justinrobertson1590]

Spectacular series!! Good on ya! Nicely done.

[@michaelmcgregor7429]

You are very good at what you do sir. Don't get frustrated. There is another you tuber that might be able to help you. He goes by the name of mustie 1. Try and reach out to him. And keep up the good work

[@anthonycphillips2430]

dear retrohax... when you are sure the cam lobe is in the correct position @ TDC, then all that should be left to check is to ensure carb flow is good and iginition.. you'll get it up and running.. i can't wait to see. .. engine looks great though... :)

[@69Phuket]

Ship it to Mustie!

[@kevinbyrne4538]

LOL Wise guy. ;)

[@kamals6624]

Don't worry I m specialist in such motors, even if the piston is reduced not worry, slight adjustment on compression will start but melige on fuel will decrease

[@surajmehta6568]

Waiting for your part 4 I really enjoyed your video Make it possible soon

[@RetroHax]

Part 4 is done.

[@Parknest]

I've been looking forward the this one. A bummer that it didn't start. I'm sure you'll get it sorted. It looks fantastic.

[@duncanblackwell958]

Mate of mine works for a hire centre. He's just said that the cam should face upwards when setting it up.

[@MindRiot395th]

Even if it didn't start - still you did a great job!

[@MalcOfLincoln]

Right mate. Cam timing. Set the cam to be rocking at tdc. Set ignition to fire before TDC. Put petrol in plug hole, insert plug and it should? run for a few seconds. Great job on this one though. Even if low compression due to wrong piston, should still run.

[@RetroHax]

It is rocking when the lobe is in the bottom position Malc but no joy. Ignition timing is not adjustable so it has to be right.

[@MalcOfLincoln]

@@RetroHax Any standard petrol engine. If cam and plug timing is somewhere near correct, you've compression and checked for spark. Cap full of petrol in the plug hole. Screw plug in and it should run briefly.

[@terry987654]

i have never worked on that model before but if you look at the cam sprocket 3.03 it has 2 horizontal lines 1 at each side they are the timing marks when at tdc they should line up at the top end of the sprocket and be perfectly straight on the hondas i have worked on unless that one is different check if there is other marks around the case that could be timing marks. the other thing did you lap the valves the inlet valve not being sealed right will cause compression loss and smoke back through the carb do you hear like a chugging sound when you pull it over like air escaping when it goes on compression stroke?

[@BanjoRen]

Looks great Martin. As for the valve timing, you know when the ignition pick up fires, you know when the piston is at tdc, you know the valves have to be closed at that point, following the suck, squeeze, bang, blow cycle you should be able to work out where the cam position should be at certain points to open and close the valves. Once that's sorted, if it doesn't start, I'd try the old piston. Give me a shout if you get stuck with the timing and I'll try to work it out for you. Cheers.

[@DaveBlaser]

I was going to suggest trying with the old piston to see if maybe that might get it to start working.

[@dumbrunn]

1. Ensure cam timing/alignment: Set piston at tdc and make sure that both valves are closed, then rotate crank about 270deg. Make sure that only the exhaust valve is open (if not rotate 360deg), then rotate it back 270deg and then check that the magneto aligns with the coil. 2. Check that the valves seal properly against the valve seats. Try lapping them in (looks tight). Alternatively you could try making some kind of makeshift leakdown testing setup by just sealing an air hose in the spark plug hole, and then listen where the hissing sound is coming from. This will not only tell if the valves are not sealing but also rule out a concave or oval bore. Hissing from oil plug: piston/bore, from carb: intake valve, Hissing from muffler: exhaust valve etc etc. Good luck!

[@RetroHax]

(Ensure cam timing alignment) that's the info, i'm looking for bud.

[@mizzesorru]

I like your determination ..i felt your anger to get it going till you've managed..I'm the same..i just can't give up ..the urge to go on it's overpowering .. very good video..i just subscribed to your channel

[@RetroHax]

thanks bud.

[@geoham11]

Great series and looking forward to part 4

[@koshtie]

Hi Martin ether should have made it cough !!!! what a mare! must be the piston like you say, look forward to the next 1 to see what the problem was? ATB Wayne.

[@paulstir]

Martin I love your dedication to the job ( having to tear it down again and rebuild is the pain ) , great video keep it up mate 👍

[@RetroHax]

Gotta strip it down again though lol

[@paulstir]

@@RetroHax martin i think at this point even after all the hard work i would be very tempted to chucking it lol , i really hope you nail it on the next run bud

[@bmxcrasher3211]

Now this really is asmr

[@dodgydruid]

I use for my assembly oil, steam compound oil I got off ebay and dose it up with some rapeseed oil making it a nice sticky-ish oil for putting bits together and won't wash off at the first blush, got the recipe off of Keith Appleton's steam engine channel and its like homemade penetrating oil (50/50 ATF/Acetone) it works bloody well lol Does pong a bit tho if its burnt in the combustion cycle but not as bad as linseed oil in a 2 stroke ;)

[@johnwyman6331]

why not just use honest to goodness assembly Lube?

[@duncanblackwell958]

That's a kick in the balls for you mate. It looks really good too. I hope you get it up and running.

[@baldanddangerous1572]

oh no ,it looks amazing tho,a good nights sleep,fresh thoughts in the morning,you can do it martin,cant wait for part 4...............all the best ..........................dougie

[@craigrobinson8242]

Great videos can't wait to it working hope it sorted soon these things are sent to test us

[@lord.onk99]

You will get there Martin. Great videos.

[@dodge7679]

Another good vid Murt👏...keep them coming 🇮🇪🇮🇪🇮🇪

[@peetre]

I agree. timing is off, that is why it is puffing out the carb. I also agree, pull start has a problem, and i would use a drill to crank it

[@barrybakewell5278]

nice job of puttting it all back same it didn't work first time but im sure if anyone can do it its you martin look brand new hope you get it sorted and we can seen the end result keep them comming martin

[@RetroHax]

Just ordered the new CORRECT piston for the next video but still need to know about the valve timing No luck yet though.

[@systemsrenegade9888]

i use standard business cards to air gap the coil on my small motors seems to work well , get plenty of spark all the time and their easy to source (lol)

[@glennmoreland6457]

Martin.. Salvage the old piston & use the rings, small end bearing & pin that came with the replacement one... 👍

[@RetroHax]

I;v already ordered the new correct one.

[@isaac2152]

And thats why and decent piece of small equipment is a 2 stroke!

[@jakeaustin9894]

Nah, I hate 2 stroke engines. They burn their lubrication and leave smoke screens when running, by design. 4 stroke engines give you much cleaner burns.

[@tmdrtn]

Hello! Great, I would not think I that the compression is lower, but you will be compressing more air compared to amount of fuel. As to the position of the cam; my answer is that BOTH will work! As long as piston is at tdc!

[@SecondHandDIY]

i recomend you look at some videos on like honda motor bike vides on timing that way im surew some one shows how to figer out you timing by what valve is oping and closing at the time piston is coming to top keep reserching it you will find it

[@bonniehollingsworth1996]

Don’t give up. Your struggle is admirable. Now you see why they threw it in the pond 🤪

[@user-dx6pt9oo6h]

Very good restoration bro 👍👍👍👍

[@buckneighkidd419]

There's nothing more reliable than a Honda!

[@RetroHax]

Haha like it lol

[@alainrouette8149]

Great video, Valve timing seems to be off...blowback by intake valve is not good.. Never mind what other video says.... just use your functional knowledge of internal combustion engine, this engine shall start on the first starter pull when all is just right.. prepare a good hot pot of coffee, sit down, observe mindfully and meditate on all this... the answer will come to you naturally... your mind knows...you just have to trust yourself and let it speak to you..it never failed me. Good Luck!

[@alainrouette8149]

Thank you for your appreciation of my comment. I really appreciate. ..just seen your complete success in 'part 4', I knew you would succeed...you have great working skill and , to me, the most important... patience, perseverence and self- confidence! Keep on the excellent work...love your videos!

[@Hoggdoc1946]

You wne to all the trouble of trying to rescue this pump and engine and didn't media blast the cylinder and crankcases, I don't get it. Also didn't see him rebuild the carb which should have been a must.

[@RetroHax]

Its a new carb fitted bud. It runs great now.

[@MrTL117]

Curses! So close! But it looks very good!

[@mtcruse]

I'm thinking 2 things - valve timing AND lack of ignition - after all, the coil WAS under water. It may have been potted but that doesn't mean 100% waterproof.

[@RetroHax]

Valve timing is what I need. It has a great spark.

[@mtcruse]

@@RetroHax Good to hear - hopefully the internet can yield what's needed for the valve timing!

[@fuentescgabriel]

You can do the timing without the manual. Put the camshaft so both valves are closed. Then put the crankshaft so the piston is on TDC. you can chueck it with an screwdriver from the hole of the spark plug. That should work just fine. At 2:57 there are two nipples inside the case (one on the left and one on the right) just aside the cam gear so those should line up with the two lines on the gear. if you see the video again, the gear is a little off on those marks. Sorry for my bad english.

[@RetroHax]

That was because the crank was taken out but it was lined up in the right teeth on the sprocket.

[@frankdeegan8974]

Thank you for no music KZbin is not MTV. Compression out the intake trimming off somehow. I do like the idea of swapping out the piston and rings. We will be here ready to watch.

[@dodge7679]

Hey Frank nice surname🇮🇪🇮🇪🇮🇪👍

[@RoelNicky]

you have a lot of patience, i would have gone nuts when it didnt fire :p

[@iamrichrocker]

maybe Mustie can help? it must be maddening...look forward to part 4..

[@RetroHax]

I just need to know the correct valve timing bud.

[@GRicsi89]

Intake valve close correctly? The valves and seats were rusty, you need to polish these. The timing is looking good.

[@Cromwell648]

Honda usually have markings for TDC. Was the plug wet? you might have a blocked jet, or idle circuit blockage. My advice check that both valves are closed at TDC. Strip the carb, clean it & try again. Good luck 🇬🇧

[@RetroHax]

That is all fine Ken, Just need the timing marks.

[@michaelb.5345]

Getting caught up on videos....great work...

[@blueribb99]

The first thing Mustie1 would have checked is spark. He does this on ALL videos involving engines.

[@RetroHax]

I did check that first bud.

[@chuckschillingvideos]

I would have replaced that impeller - it is extremely worn and will not operate nearly as efficiently as a new one.

[@Quickened1]

with hands that move like that, who needs an air ratchet!!!

[@djevo3441]

Very nice restore....but i think the problem is in piston....maybe must find the same like the original...and take a look in to the carburettor

[@RetroHax]

Check out part 4 bud. Its just been uploaded.

[@sv7gbr]

By having a look at your channel I can see many videos with different content, eg. foods and mechanical restorations. Now about this engine restoration, keep in mind the basics: The 4 stroke engine cycle. Intake-compression-combustion and exhaust. First of all be sure about where the TDC is. It is very critical. As I have noticed at all 3 parts, you have not disassembled the flywheel from the crankshaft. So how you know the correct engaging point of these two? In case that the key is broken (or may be missing!) then the crankshaft rotates independently of the flywheel and by this ignition is not timed (some briggs & stratton suffer from this). Also in that case the crankshaft/camshaft timing is not correct because you have based only on flywheel markings and not crankshaft itself. The flywheel markings are there for the ignition timing, NOT the camshaft timing. At least not necessarily. Now after this, there was no need to do really a lot of work in order to re-engage the camshaft with crankshaft at 180° difference. It was more simple to check if after passing the combustion point by rotating the engine to BDC and further then the exhaust valve should start to open. Or if the engine was at TDC after exhaust, then the intake valve should start to open moving towards BDC. Many YT videos are not accurate at all, so never based on them for timing an engine. I noticed also that you didn't make any measurements prior to reassembly the engine which means that if enough parts were out of there tolerances, cooperation of them is not sure. Additionally try by some way to test the compression. Some engines have on camshaft gear a sub-mechanism in order to decompress the engine during start-up and by this help not to tire the user/operator.

[@RetroHax]

Wow, there's a lot of info bud but I know how to build engines. Your assumptions are incorrect. I know all about crankshaft and camshaft position and tolerances and have extensive knowledge on small engine repairs. Check out my other channel RETRORESTORE.

[@MrGmoney48]

Sad that she didn't fire. Thoroughly enjoy your videos though. You're more patient than I am. That's for sure. As a matter of fact, I'd redeposit it back in the lake.

[@RetroHax]

haha, that would be giving up lol

[@LMF5000]

Also, if it's puffing out the intake, your timing is wrong. It's opening the intake valve on the up-stroke instead of the exhaust valve. It should be puffing out the exhaust side ;)

[@RetroHax]

Yes I know that bud.