Yamaha Dtr125/bought a motorcycle with a rattling engine and flooding carb/piston slap in an engine

My friend bought a dtr with a rattle we thought valve had clipped piston or rubbing or slack because it had just had a new piston 3 days ago with a receipt and carb wouldn't stop leaking out of the overflow pipe soon as the petrol was turned on

[@lewisodonnell234]

Definitely one clued up DT guy. Nice job mate

[@2strokemxclassics]

Thank you m8 thanks for watching👍

[@lewisodonnell234]

2stroke mx classics no worries. Iv got a electric start engine im trying to restore using your videos. I can understand the way you explain it. I literally can’t go wrong 👌

[@2strokemxclassics]

Thanks so much for that comment m8 cos that's my aim to do is give all the details in my vids and no bull or talking ages so they haven't been time wasted watching with some parts missing, good luck with your dtre I'm on doing one myself too if you need any help give me a message👍

[@lewisodonnell234]

2stroke mx classics nice one no prob mate I find it hard to understand on most stuff you know how to explain it. I had a nice black 2005 supermoto dtre last year but someone nicked it I was proper gutted still am and that’s why I’m doing this engine because it’s from when I had my bike as a spare

[@timothydante8910]

instaBlaster...

[@robhayter484]

Well done mate great job and good video, I’d check the packing in the end can tho 👍

[@2strokemxclassics]

Thanks m8 it was my friends dtr ill tel him about the packing👌

[@robhayter484]

It just sounded like it needs repacking , great job tho , I’d let you work on my dt any day haha

[@2strokemxclassics]

No probs m8 yeah it's a bit loud when he rips past it still sounds good tho, thanks man if you ever need rebuild on your dt give me a shout👍

[@robhayter484]

@@2strokemxclassics thank you mate , I’ll keep that in mind 👍

[@jessebrown9046]

Piston slap like a sob at the beginning but it sounded damn good at the end, if it wasn't so cold here right now I would have my 200r running, I don't have a heated garage

[@2strokemxclassics]

Yeah a know bro lucky it didn't snap rings he told me it had the right piston, same here it's snowin I've been needing to get my dt fixed for a few weeks but to wet an cold, how far are you on with yours now

[@podgebrennan1]

Well put together man . I had the issue with the powervalve . It's in my vids . CDI unit wast toast

[@2strokemxclassics]

Thanks man yeah av had a few with the cdi making the pv just spin constantly when the keys turn Al take a look over to your channel bro

[@bigdane778]

Cracking job pal

[@2strokemxclassics]

Cheers big D lad👍👌

[@hanik7478]

I hope u can help mate by telling the jets and the needle clip on your bike, mine has 22.5 pilot 200 main and on 4 the needle clip

[@2strokemxclassics]

Hi m8 the pilot will have been a 22.5. only the dtre takes a difo size 17.5 pilot. the main will have been either a 240 or a 210 and the needle clip will have been on the 4th clip it was all standard settings.

[@nrthlincspyro8622]

Got same issue works on cycle gets to 8 k then flat then will suddenly work Was all fine b4 full rebuild

[@2strokemxclassics]

Check powervalve cables are on right m8 there's a long and short one the may have got muddled, best way to check if powervalve related is disconnect servo and open valve to full and see how it runs

[@nrthlincspyro8622]

classics haven't removed cables was working fine got bottom end done by a local bike builder tzr dt 2 stroke bloke always top notch work Its weird

[@2strokemxclassics]

Yeah not to sure what would cause that if only the bottom ends been done

[@ols7390]

Nice one mate, that engine though sounds so bad lol

[@2strokemxclassics]

You bet m8 she was canny noisey

[@myturdsforyoubuddymyturdsf6609]

Hi there mate big fan of your vids i not long done Top end rebuild Fresh Rebore on my DT how many miles would you Recommend for break in before i can start to really open her up i done 100 miles so far taking it easy i done the 15min heat cycles letting it fully cool some people say 500 miles but i dont believe that whats do you recommend for me mate

[@2strokemxclassics]

Hi m8 if u do the first 15 and 2nd 15 which you've done now just take maybes 10 to 15 minutes more and she'll be OK thanks so much for watching👍

[@myturdsforyoubuddymyturdsf6609]

Cheers mate thanks for your help

[@2strokemxclassics]

No probs m8

[@rdom4256]

Nice job! Did he buy it like that?

[@2strokemxclassics]

Hi m8 yeah he had the receipts for the piston

[@rdom4256]

@@2strokemxclassics:-) Didn't seem to mess with the cylinder wall too much, I presume it wasn't ran for long like this?

[@2strokemxclassics]

Just to start it up m8 3 days earlier he said he hadn't ran it

[@justafk6332]

is the kindof quiet rattling at 19:58 bad ? I have that too and don´t know what it is. maybe someone can help me out by saying what is causing it ?

[@2strokemxclassics]

Hi It's normal to sound like that, the phone make the sounds seem louder an diffrent, 19:58 is OK, hes still riding it now

[@officialmysteriousrider6327]

They all tell you that when you buy them it's just had new piston fitted lol fucking hell that had more slapp than a prostitute on Spencer place 😂😂 well least yous sorted it out pal should change out them crank seal's too & water pump seal to be on the safe side

[@2strokemxclassics]

😂 Aha its all sorted for now m8 he's gonna run it in Al change all the mains n seals if he ever wants them done m8

[@officialmysteriousrider6327]

@@2strokemxclassics do them Chinese clocks fit ok or are they smaller or are their any differences i mean m8. just waiting on a new crankshaft to get delivered myself iam gunner use the one i built up for the other engine from them cases i bought

[@2strokemxclassics]

Hi m8 yeah the brackets are the same as dtr top yokes width, maybes with all the wires joined they'd fit dtr but with no rev counter, be handy for someone building a dtr what cant find clocks av described them in part 4 m8 cos someone else asked about them there werth spending 16 kwid just for the cases off the speedo, the square smaller case fits str8 onto dtre brackets too, sounds good m8 are ya putting new one with crank rebuilt into the cases and fitting to yours, what are they charging for crank rebuild and to have it trued m8

[@officialmysteriousrider6327]

@@2strokemxclassics i built the crank myself & trued it on my other engine & was thinking of getting some of the clocks myself with mine having key crapes on the side & wish they would make bang on replicas of the tacho meter ino they make them but with no temp gauge

[@2strokemxclassics]

Yeah a know m8 the speedo case is the hangiest part on them found out the ignition doest fit the Chinese base though there's no room

[@theinkedgamer1703]

wheres a good place to get parts for these bikes?, i have the 2000 , need to stock up as parts getting hard to find

[@2strokemxclassics]

Hi It depends tbh ebay have some parts, fowlers UK sell many new parts. some parts are rare for your 2000 (wiring harness, cdi unit, left switches, plastics)which aren't made now but there's a couple of Chinese places that sell parts and there's a place in Portugal that does OK plastics, I have them on my white one on here apart from the rad shrouds as there a difrent shape too the originals. Bikerpartsshop is one and Ali express is another hope this helps

[@theinkedgamer1703]

@@2strokemxclassics thanks man , that will help no doubt, im having a custom harness made this week as the orginal is a nightmare on it couldnt find a good one anywhere

[@2strokemxclassics]

No probs the panels on them sites are OK so are the chain guards and handguards yeah m8 they hard to find I keep a working loom back then if I get a cut plug one I can copy off it, was your old loom missing plugs or just not working

[@theinkedgamer1703]

@@2strokemxclassics the loom is working but its just a mess , indicators need fixing cant find the wires for them although they are there somewhere, lights work, rear brake light works, just enough to be safe , its a mess everything just taped up etc, also what are your opinions on pinning open the power valve?

[@2strokemxclassics]

I'm on insta m8 if your on there send is some pics, a like them better pinned I've had them like that since 1991 tho so am used to them pinned. I like the powerband to kick in, there's a test drive vid av got on the ellecy start ya can see the acceleration, it's just personal choice some say pinned better some say working is better but the thing with working ones wen you give it some hammer the valve opens but then when u let off the revs the valve rotates back towards the piston, say u got a 57.5 piston in on a normal powervalve when that bore wears down the powervalve will be able to clip the piston, say your in 6th gear wide open the valve will be fully open missing the piston, wen u let off an the bore finally wears that powervalve can rotate back and hit the piston

[@jimmywaters8929]

Great vid thanks , I may have missed it, but what was causing the slap, and the servo to run the wrong way. cheers

[@2strokemxclassics]

Hi thanks for watching, the Piston was to small he bought the wrong size and whacked it in, this was causing the slap, I'm sure he put a 56mm piston into a bore need in a 57mm piston. the powervalve wen bikes start moving spins the correct way av had a few that spin differently but all work the same wen moving👌

[@jimmywaters8929]

@@2strokemxclassics Ok thanks, appreciate your reply, my power valve is acting some what erratic at idle, jumps around a bit, got me a bit stumped, keep up the good work, cheers mate

[@2strokemxclassics]

No probs m8 I've had them with powervalves that lock and only go one way and then wen cables are took off the servo motor just spins constantly wen turn key and its been the cdi on 97-2003 bikes, might be cdi related if not the servo motor m8

[@jimmywaters8929]

@@2strokemxclassics Yea I hope its the servo and not the CDI $$$$!! lol

[@2strokemxclassics]

Defo m8 there gettin harder to find aswell

[@avuor6706]

Is that ratling sound dangerous....have the same problem or does it go away in time

[@2strokemxclassics]

Hi no it gets worse u need a new piston, very dangerous cause major damage it breaks

[@avuor6706]

Well we just rebuild the engine and the noise came after first start?

[@2strokemxclassics]

How big piston did you put in

[@avuor6706]

Orginal + 1.5

[@2strokemxclassics]

What year is it 88 to 97 std piston are 56.4 whivh would take yours upto 57.90 like the white dtr if its a 3mboo it will be 56 std so would take it to 57.5mm m8

[@stuartbrown2111]

when i heard the engine @ 02. seconds in,, i thought "PISTON SLAP" THEN 3. 55, the piston is doing an impression of a woman i must love,,ie a right old slapper . but hey thats love for ya.. :). am hoping she wont notice ive said that, here is some advice for guys with prego girlfriends,, "dont have the kid at home" or p isto slap[ will be the last of your relationship woes

[@2strokemxclassics]

😂😂