trying to fix the dune buggy

[@ratherBweldingChris]

Go check out my Patreon page at patreon.com/ratherBwelding

[@eavesstreet6307]

Bad coil > coil gets hot > no spark

[@jeep2003]

If the plugs are wet when it dies then the problem is spark. Or just try with starting fluid. Very common for coils to heat up and die. Or the condensor if your engine has one

[@mdftrasher]

Verry good point, coils can do strange things. Weed wackers come to mind, they have cheaps coils. One moment they work fine, the next....

[@datraktorman69]

jeep2003 I have had alot of problems with coils to but he needs to read all these suggestions and actually try what the people tell him and he might fix something haha this could be a few different things ranging from float level to valve lash or coil or a vacuum leak

[@airgunningyup]

AGreed , ignition problem is a solid bet.

[@dooleydooley4742]

I believe its the valve lash.. Once she warms up a bit, valves stay the slightest bit open and that happens... .002 makes a difference, y'know.

[@matthudson1724]

either this or bad coils. I've had coils that wouldn't work once they were warm but we're fine cold. have very similar symptoms.

[@junkforlessutube]

This doesn't apply to all shim bucket motors, but the shim "spin test" works on most. In short, you take the valve cover off and turn the motor over until the cam lobe faces away from a shim/bucket you wish to check. Then, If you can't rotate/turn that shim you have clearance issues. This doesn't replace measuring the clearance with a feeler gauge, but any that can't spin will no doubt need to be corrected and will justify a full inspection of all clearances. I recall you rebuilt this motor. Did you happen to keep all the valve shims in their original locations?

[@tankloverrc1344]

Dooley Dooley I know what can fix that problem.... get stronger valve springs.

[@JapandaTuning]

The struggle with these small engines...I feel you. Tried to take my engine to a motorcycle mechanic and nobody works on chinese motors. I am stuck trying to figure out the problem myself and its going nowhere.

[@themotochannelu.k5098]

Japanda Tuning its a gs 500 engine !!! Not small mate !!

[@carabela125]

As soon as it stops running, take out a plug and crank it to see if it sparks. Could be a spark problem that only happens when hot.

[@xaaps2010]

Coils heating up and going bad, check for spark after it dies.

[@gravediggmn]

this, sounds like a heat soak issue

[@larryneyii2162]

Yeah sounds like coils something to do with spark it's getting hot and things expand?

[@ExperimentalFun]

try spraying some fuel into the intake when it dies, if it starts then you know its not getting fuel and the floats are stuck or something is clogged. If it doesn't start then it might be getting too much fuel or some kind of ignition issue spark/coil

[@brianw4brian]

Experimental Fun I agree boggs down starved for fuel... Try fuel delivery. Carburators are funny sometimes. Tap the carb. See if fuel needles sticking...

[@Darwinpasta]

My first thought is vapor lock. If the fuel line or the carb is getting too much heat into it (usually too close to the exhaust), the fuel vaporizes and the carb can't work with that. Heat shields might help. But yeah, check for spark when warm, and valve lash might not be a bad idea to check either.

[@Dastardly84]

As other people said, spray starting fluid into the intake when it dies and see if it fires. Check for spark when it dies (Could be a bad coil). If it has spark, then check the valve clearance. It can only be so many things. I've been stumped on a few things my self, but usually figure it out with time.

[@domenicozagari2443]

Can you build a vintage cycle kart :)

[@markssmallengines3542]

I'd be looking at coils and all ignition components aswell. They usually start failing when warm. Great builds mate well done 😁

[@stoobydoo4790]

I don't know for sure , but it sounds like your problem started when the engine gets to operating temp. Maybe vapor-lock , does the fuel line run by any heat source ? Or possibly is your motor getting the air flow it needs to cool it. I know these may seem simple, but they are often overlooked. We know it heats up it stops, cools down & then starts and runs till it heats up again . Don't get discouraged, keep knocking away at it. When you find it you'll 🤔 " How did I miss it ? " GOOD LUCK !! 😉 Really enjoy all of your videos

[@skarekr0w3]

I would hit up Mustie1, this is his thing. Getting engines running good is what he does.

[@meetn2veg]

One general suggestion ... leave the accelerator ALONE when trying to restart an engine!!! Flooding an engine wont help! As far as the problem ... sorry. The only thing I can think of is some sort of temperature sensor on the engine that "may" be cutting fuel off due to false reading, or sensor not connected ... etc... Something like that. But PLEASE ... leave the gas alone when starting! ;-) Love watching your vids ... in fact I'll soon be making my own Mini Green Mud-Spraying Machine!! :-D It might not be green though! lol

[@jeffackley1210]

I used to be a Suzuki mechanic . They had a problem in that era with bad ignition signal generators that would heat up, stop working and be fine after a short cool down period. Next time it dies, check for spark and, if you have an ohm meter check for continuity through the generator. I'm sure a little google time will show you better than I can tell you. Also, pumping the throttle like that is useless, as CV (constant velocity) carbs have no accelerator pump and the throttle control is not connected directly to the throttle plates. (More Google time.) Good luck, hope this helps.

[@southronjr1570]

After it dies, see if starting fluid will get it to run for a few seconds, if it does that means it's a fuel system problem, if it doesn't it means you have either a mechanical or electrical problem. After it dies again, pull the spark plugs and ground it out on the head with the wire attached, if you see a spark across the gap then it's mechanical, if no spark, it's electrical. Hope that helps you get started down the right path to get it running.

[@GaryLordsWayMinistry]

Fuel filter is upside down maybe too, I do not know if that would create a problem but it might. Hook up a fuel pump and regulator, that way you know you have enough fuel for the power rating for the service it will be doing. Might have to run a return line as well with the fuel pump though. Run racing fuel as well might help.

[@Hollaendaren]

This may sound boneheaded but is your fuel tank breather plugged? If it is (or if you don't have one) the tank will pull a vacuum when fuel is drawn out and finally it won't give enough fuel to run the engine. After letting it sit for a bit the pressure will equalize and it'll run again. Next time it happens, check if you have fuel in the filter. And try opening the fuel cap then try starting again. Not saying this is definitely it but it could be. It happened to me and took me a while to figure out :)

[@MrJakezorro]

Hey. I am a Finnish man. I really like your videos. Good Job.

[@OddisProductions]

Engine is running to rich. Doubble check valve lash, jetting size (so both are similair). If you bought that fuel filter new and it's that clogged, you know you have a debris problem in the tank also. Keep in mind the fuel tank is heating up after a while and might need serious ventilation. Put a heat probe on the engine and a wideband o2 sensor in the exhaust while you investigate further. Some fuel tanks might need an internal baffle around the pickup line. I would however recommend a plastic tank. If you roll hard and the metal tank is ripped up that could create a spark. And bang.

[@Hippie459MN]

Check your coil(s). I had a dirt bike that would do that. Start up, run great then the coil would get hot and stop working. Let it cool down for about 5-10 minutes then then it would start right back up and run great for 5 minutes or so until the coil go hot again. As soon as it does that, pull a plug and check for spark right away. If no spark, let it cool down fully then check for spark again.

[@gernblanston4956]

Lol, you need to pump the accelerator more, the accelerator pump is not working........Oh wait, it doesn't have one!!

[@magicdevil1996]

Do the gs500 carburetors rely on a vacuum force to get the fuel in to it? maybe its stopping fuel getting to the carb fast enough, so the bike cuts out and then starts again once its been waiting a few minutes.

[@alexanderwingardh879]

Keep it up you are really good

[@thedanwind]

My advice, check the valve lash, as suggested. Also check the pilot screw adjustment and choke. Just my limited experience.

[@ricksherrod1418]

Check for spark when it won't start. Should be able to jump a 1/4" gap if coils are strong. If spark is fine, try adding propane to one carb when it won't start. If you're lean it will start with a little added propane. Also, next time when it shuts off pull the air cleaner really quick and look in carb for a white block of ice condensation. In temps below 65 fahrenheit, a growing block of ice in carb venturi will change your mixture and will shut off. Remember that those carbs have no heat whatsoever to keep them from freezing. Air cooled engines usually have a warm air pickup at air cleaner inlet to pick up warm air from around exhaust tubing for cooler weather.

[@jpwipeout99]

I think you might have a crack in the intake manifold. Because when he first starts off the crack is very small but when it warms up it expands into much air is leading in the mix is off. When it cools down the crack become so small but after doing that a couple times the engine still too warm in the crack is too large. Or maybe a crack somewhere is but I think I would look into that.

[@mihkus]

Oh yeah... I might be wrong but perhaps your problem may be air hose going from crankcase to carb... Not enough pressure. How are your seals? Might need to check those

[@TheBrabs007]

Have you set the floats? Fuel filling the float bole to slow and the 10 minutes the bole will be full again and that’s why it starts, just my thoughts

[@chitwood73]

Probably overheating since there isn't much airflow causing a vapor lock in the fuel line? Maybe?

[@brittond14]

sometimes the stator will foul when it warms up. Then work again when cold. Would check for fire when is fails.

[@BigSwede333]

Check out the ignition! Could be the coil. Recognise the problem from outboard engines.

[@DonziGT230]

Pretty sure it's not a fuel starving problem, and that filter should have more flow than you need as long as it's not full of junk. I'm guessing it's loosing spark due to heat or the valves might be too tight. Ride it 'till it dies, uphill so you can coast home. As soon as it dies pull the plugs and check spark and compression. Compare the spark quality and compression to what it does just lightly warmed up when it's still running well and you'll likely find the cause of it dying. If the coil or stator is going bad or has a bad connection the spark will get weaker as it warms up. If the valves are too tight they might not fully seat when warmed up and expanded bleeding off compression. Couple other things to note. When it died at the top of the hill instead of muscling it you coulda put it in gear and used the starter. When you were coasting down the hill and approaching the uphill it was dumb to yank the wheel around, you scrubbed off a lot of speed that might have gotten you over that little hill. And before getting out to push you coulda tried to start it again since it had had more time to rest. Not belittling you, just giving you some pointers in case you keep having this battle.

[@frankwhitt7245]

i agree with the guys above, not a fuel problem. its either coil or valve adjustment.

[@sandylancaster5901]

don't give up on it you will get it to work. if you can build a lathe you can sort this engine

[@Thorbrook]

Check your spark. I have a 82 kz1100 do the exact same thing. Run great till it warmed up. And would not hit a lick. Found out the coils was getting hot and the winding was separating. And causing a weak spark. Replaced them and problem went away

[@thomas5221]

Try cleaning the exhaust pipe... I had the same problem with my two-stroke engine and it solved the problem

[@1teddy1979]

If I had to guess I would say maybe coil. I know sometimes they can quit or have weak spark when they heat up

[@lilhack69ify]

Internally shorted coil. Coil will work until it gets hot. Then shuts down. Then it will restart after a cool down. Replace the coil.

[@PiazzaWoodWorks]

You need to vent the fuel tank , not through a little hole , have two sidewinders and they ran header tanks , they need to vent Check for spark when it does die too

[@mikemuzzell5167]

My gut says ignition coil. Heats up stops working. Cools down stars again. Happened on my dokota.

[@bencarr1047]

In my opion seems like it is getting to much fuel, because whenever you was riding and had your foot on the throttle it was fine then as soon as you came to a stop it quiet and normally whenever it won't start for a few mins means it flooded out so you have to wait on some fuel to evaporate I would check spark plug and see if it has a lot of fuel on it and go from there, I read a lot of the other comments they all make very good points. Hope you figure it out

[@OldCarAlley]

Is your fuel tank vented? Are the fuel lines big enough?

[@jimparks1098]

Your problem might well be a defective ignition coil. Check for cracks, etc. when it dies out, check immediately for spark...if you have none, and it returns when cool, theres your problem.

[@yuhhman3494]

when it dies spray started fluid in the intake. If it doesn't turn over then that tells you it's a coil problem

[@rileycoyot42]

Also you have to make sure that the carburetors on those engines are synchronized or they can cause problems

[@hellzs]

your carbs are getting hot, add a heat shield between the carbs and block or increase air flow around the carbs. had this exact problem when i bobbed out my Honda CM 200

[@keithw372]

it is over heating.. it is air cooled, and the seat is blocking any air flow, that is just my thoughts.if it was fuel it wouldnt run as long as it is.

[@eurobeatmachinist732]

keith w air/oil cooled

[@keithw372]

yeah but sitting with no air will make it get hot, its just my thoughts on it.

[@ratherBweldingChris]

keith w I dont think it’s over heating when it dies I can touch the engine and it’s warm. Plus I do have that fan on it.

[@keithw372]

okay just a thought, the whole waiting ten mins to refire doesnt make alot of sense

[@Matze941]

Is it possible that the carburator gets to hot? If it does, the gas starts boiling and the air bubbles will "clog up" the Jets. Its a common problem on older, air cooled Bikes when they are driven on a hot day in stop and go traffic. BTW, did you check if you still have spark when the engine dies? Sometimes the ignition coil gets bad and wont work anymore once it gets hot.

[@mxrider2strokebraaap54]

I hope its easy to fix.. Nice video

[@hugospence3741]

It could potentially be that cdi you bought in the last episode of the gs500 rebuild-just a thought

[@watahyahknow]

dont think its a fuelproblem think its the ignition coil getting too hot and short out o loose their power , should be eazy to check if you take a sparkplug with you , next time it stops take off the sparkplug cap put the other sparkplug in and check the spark during the start the coild getting too hot to touch might be a good indicator too

[@andy7555]

has the float got fuel in side and i would check valve clearance for intake

[@chimwando1]

the carbs are blocked, when cleaning the carbs make sure you separate them.......i have experienced such and i discovered that the pipes linking the carbs had a blockage.....

[@bubbarodge]

Does the gas tank cap have a hole to let the tank breathe to allow the gas to continue a good flow?

[@acoelho001973]

Coil problem

[@WesleySnyder]

I'm sure someone's already said this but I think the coils are getting hot and losing Spark possibly the CDI also

[@stuartdavies9879]

Are the carburettors blocked from all the crap in the fuel

[@eurobeatmachinist732]

Coils...

[@yaboiavery5986]

Hey dude I'm trying to get into welding but there's a problem I'm not sure which welder to buy I have no idea what I'm doing and I'm on a budget

[@djaydeved]

my grandpas chainsaw has the same damn issue runs for a bit and fucks off but it only happens in the summer ran it in winter and she ran like new or atleast a similar issue

[@masonmeek684]

Let's go keep up the great vids

[@MrELUMAN]

How it´s made?PLANS AND MEASURES?..have you a link with PDF?

[@JDomas1]

maybe check the fuel gas tank flow if it runs really slow its may not filling the carbs full to start engine and when it sits fills carbs full to start it and ride for a little (sorry for bad english)

[@CertifiedRippers]

you should put a plexy glass window for a wind shield and a net on the sides....

[@stevelecain886]

could be your ignition box, they usually quit when hot, who knows I am not a bike expert by any means.

[@Duane002]

It’s that steel tank! You need to coat steel tanks or they corrode and all that corrosion ends up clogging your fuel filter and system! You can order the stuff at most motorcycle dealerships and repair shops!

[@TheDriftTrikeChannel]

how did you get the mph on the video?

[@aleblanc3547]

Lots of valve, carburetor and coil suggestions. Let us know what you find. Thanks, man.

[@coreyscott6430]

I built a kart with the same motor had some problem 5psi max fuel pump and a tune

[@petergutierrez3366]

It probably the ignition coils getting hot and quits running till they cool off

[@GENERALCHAOS13]

I wanna check it out wish I was there to help you out

[@thedanwind]

Also motorcycle carbs don't have a primer pump. So no need to pump the gas pedal.

[@mr_jsb_07]

Bro...It's simple, Your engine is good condition and your carburetor too. But your CDI is not good condition so put on a new CDI. Your problem is electric, CDI did not control the whole current lode. So don't mind bro you can do it.

[@jacobdingledine5506]

JSB Cars these Suzuki gs twin engines don't use a cdi, they use an igniter. And a new igniter is 400$. So if you have one of there engines you better damn well hope you don't burn out the igniter

[@93jake81]

It sounds like it dies when it warms up. Is there anything electrical that kicks in when the engine reaches a certain temperature like a radiator fan or something? If so, try putting a bigger battery in it of looking over the wiring on it. Hopefully this helps 🙂

[@jeredpowelzyk7398]

Maybe the coil/cdi overheats when it runs for longer than 2 mins

[@matmuffin1]

I instantly think valve lash

[@Reece634]

wow you can literally hear how off the valve clearences are

[@chrisbow99]

yeah also along with everything else everyone is saying. motorcycle carbs are not like honda clone carbs. when you step on the gas the primary jets shoot fuel into the cylinder just like a truck carb. so you most likely also flood it when it stalls.

[@DinosaurJuiceCars]

How are you controlling the choke? I think it might be running to rich when hot.

[@willthedingo]

Hmm. Another thing that may be going wrong, only to the driving part of the video. You're treating it like a car engine pumping the throttle. It doesn't work so well with motorcycles in my experience, it's too easy to flood the engine that way on motorcycles. Awesome buggy though, and absolutely something I'll be considering in the future myself!

[@ExtraFungus]

Should have used the opportunity to treat it with red-kote and put a new fuel filter on it. Then if you're still having problems you can add a fuel pump that works of pulses from the vacuum.

[@ExtraFungus]

I commented before watching the whole video. www.banggood.com/Lawn-Mower-Engine-Gas-Fuel-Pump-Filter-For-Kohler-Briggs-Stratton-Kawasaki-25-HP-p-1105480.html?p=R204001728477201506H Buy that, treat the tank with red-kote, you can get it at your local parts store and replace all the fuel line. Check your carbs again to make sure there's no trash in them. Once you've done that, you've eliminated fuel as your problem.

[@alexllena7769]

Hello, can you told me the web site on you shop the wheels???

[@bullseye1263]

probably the coil when it gets hot it wont run when it cools off it runs fine

[@redorrick427]

I think cylinder is glazed up and it gets to hot and piston swells up and quits and when it cools down piston gets smaller and starts again but barely.solution is hone the cylinder and buy new rings.check compression its probably 90lbs, or under.

[@rileycoyot42]

Are you sure that it is fuel and that it isnt over heating? Those engines are air cooled but they are designed to be at the front of a motorcycle where the air is coming right at it. The seat being in front of it could be blocking the air flow past the engine and causing it to over heat.

[@neyvindeleon1080]

I love your videos man, but please devise a way to add a seat belt to the dune buggy. You never know...

[@5_twenty]

wonder if the engine is strong enough for that frame

[@jmiller9726]

Put a small 2-4psi fuel pump on it but not one that goes over 4psi so you don't flood the carburators

[@mu9900]

J Miller, carb dont need fuel pump ... If the gas tank higher than carb, the carb will have fuel flow ... What I think is carb tune

[@jmiller9726]

Yes a watch him he did it along with other people on KZbin

[@jmiller9726]

@ken baker

[@ExtraFungus]

J Miller www.banggood.com/Lawn-Mower-Engine-Gas-Fuel-Pump-Filter-For-Kohler-Briggs-Stratton-Kawasaki-25-HP-p-1105480.html?p=R204001728477201506H

[@joshuadupont7172]

Check/change coil. Had an engine have the coil going out. It would get hoy then wouldn't wanna run too well

[@davewalker1785]

I worked on a mates gs500 same symptoms was the coil.

[@kingavegarage8722]

You need a chase buddy for your test drives. So they can tow you home.

[@thataquariumchannel6297]

Valves or coils one of those , let it run for like 10 minutes take out the spark plugs, WITH GLOVES and turn the engine over if you don’t see spark the that’s your problem . Now with the valves , check them these Japanese engines are picky when it comes down to timing both intake and exhaust . Also mabey the simplelist answer is the right one, IT JUST NEEDS A DAYUM TUNE UP. Oil and Spark plugs

[@claytonsuarez8276]

Bro try popping the clutch when ridding down hill. That might get it restarted to get you back home. Also it has to be gas man, that gas came out way to dirty, it will make everything dirty inside. Like your injectors.

[@brandonlauro]

U should clean the boats of the carburetor I think the jet might be dirty

[@randigarner3575]

Sorry but it’s the cdi. It gets hot stops working it it cools. Not fuel. First question where did you mount the cdi control box is it getting air? To see if I’m right when it stops running check do you have spark.

[@nickkaarslev290]

When you were rolling down hill you should just have put it into gear and jumpstarted it. i was screaming at the screen the whole way down lol

[@Flynnty]

First try the most simple thing which is new plugs. Then buy a compression testing gauge. Check compression when it's cold then when its hot. My guess is your rings are worn causing the compression to drop when engine heats up. It's a common issue for older engines.

[@pauls466]

Its a downhill gokart lol . Take a spraycan of brakecleaner with you and if it stops try see if it runs on that if yes it's not electric ,Good luck

[@rustycar35]

I'd recommend POR 15 for sealing the tank