4HW Smokey
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Ez all so managed to get my TZR started again today not had it running right at all yet it refused to fire on NGK's and only seems to start if I put my fist down the airbox breather with box off then is fine once the box is on and only works on an old nippon plug I found in a box of bits.
I have tried to adjust the oil mixture and it all looks good the spot lines up at full throttle I have tried disconnecting it and bleeding it but no matter what ive tried even a lil premix the old girls smokes thick blue smoke and is a bit intermitant on the revs once shes warm seems to rev ok but not had chance to test ride as mot has ran out.
Last time I took her out she only revved to like 7k and soon as I hit 3rd gear she bogged out and refused to start again for the day.
I have had the carb out and the plug is always wet when I remove it I also tried the dtr carb as its so close to TZR just diff jets and a diff main jet plastic spacer thing and it done exactly the same and cut out same spot in the road in 3rd gear?
Any ideas appreciated I know its probly one of them you gota be there in person to investigate things I got my daughter to do a couple of lil vids so i'll get them off her whens shes back from her ride with mum to show the amount of smoke and its engine noises.
Cheers hope thats enough info
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Hmmm really hope not I never got round to looking at the engine just fixed the starter gubbings and slapped it in was more concerned about is the whole bike here form the box of parts also was told its a nickle piston or something so didnt want to strip it down with no funds for a decent rebuild. Ive not even taken the power valve out to check for carbon build up.
Really hope its carb or air related or im going to have to strip her down and rebuild hope ya wrong bud thanks for the insight I'll go see if I can get the vids n host them somewhere as i'm trying to get away from google n the likes
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aww the bloody daughter stood right in front of my plate for the world to see wonder if can edit it out somehow or get a fresh vid next time im out there.
Watching the vid is very thick white smoke so you could be spot on looks like a gasket set hunt is this eves mission
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managed to edit n upload hopefully will work https://mega.nz/file/vMkl3Kob#dOU6v_jymYYKzuvNmbKsBiXp5X-_WsLvXkndDuTCBJU
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Throw a compression check on it, would be my first point of call. If the head gasket is gone then it'll be down on compression. Stick your fingerd in the radiator cap, if you end up with black gunk on them then it's blowing two stroke into the cooling system
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Magic cheers bud dont have a tester you rekon this will work ? https://www.ebay.co.uk/itm/394118183625?_nkw=2+stroke+compression+tester&itmmeta=01J67RA77SV7Z08AJ0RCMKBTY4&itmprp=enc%3AAQAJAAABAHoV3kP08IDx%2BKZ9MfhVJKkN1TBtlwai0T3SBqt5oIjYxiMGSmHj8R5BFWCHthaVHb5m%2FQ%2BRaRfW0BWKM%2FkdSszRDDTRf1K2gCcZzx7FFpV0baOebmUCUfoZHzw8xO1rUzKl6AfZsZFKy85ZxthUaXCfqyxQfefgTk6VQYr%2B5d9i4i3Gjl2xMLyYtLNBhKbuX5cKTmLnAfH5614sziGCB748M1XvNiqdbfy7CTlINsaiqUwKrhH0qIznz9F9FnFm9CgTgq2Ec6bZ%2F1cw6HNzp5LP0kQbU6Xil0xu7j%2BIuzDM1Vw%2B7cJ4p9NgxRJhRfDrXhTlnKCUiC4DSvp0EqwFrCc%3D|tkp%3ABk9SR4T0qPixZA
Coolant looked pretty clean last time I looked but will check that also thanks
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Just had a look then just shy of 50 for one of them might just grab one of these for now n hope its sealed properly roll on payday but now my brains going buy cheap buy thrice lol il sleep on it and ask around see if anyones got one in there toolbox i can borrow
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put it on watch just in case he says hes got an endoscope and comp tester at work he can bring home we are gonna test the coolant like you said and trying to find a gasket set found this one but not sure if it right yet as doesn't state models https://yambits.co.uk/tzr125r-gasket-set-full-p-2866.html
May as well just go through it all once i got seals n tht thanks for help m8
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Whatever you do, DO NOT BUY A CHEAP HEADGASKET.
In all my years of building DTR engines, the cheap head gaskets don't work. Buy Athena, buy PJME.
https://www.pjme.co.uk/acatalog/Yamaha-TZR125R-Full-Gasket-Set-Athena--3359.html#SID=297
What's the code on your cylinder and I'll link you to what you need.
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Legend was on there and somehow missed it thanks bro
i'll look at the head in the light tomo as don't think got any photos handy -
If it was nicasil plated then it'll be the 4FU barrel which will run a 3MB head gasket.
https://www.youtube.com/watch?v=P8okvTxe-Bs
Which will be like that.
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Thanks again me n the mrs been watching rebuild vids n stuff hopefully my bore is ok so dont have to faff n get it redone will triple check as we go through it all and have some funds for the bits needed
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Just wondering of you have done something similar in the past ive got that other DT engine and the bottom end looked very similar with the oil pump etc would I be able to run that in the TZR without messing with the loom or would I have to change CDI ive got a few old ones in the parts bin if that is the case was just sat thinking maybe I could chuck that engine in for time being to get her moted and then fault check the gaskets and seal on the other one? I know the gearing would be a bit different just thought ide ask before I test it out when weather n my health permits
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Frame looks same bottom end on tht looks like the dtr engine I have my 4hw has no cover over the oil pump and has some kind of make shift bracket for the oil cable. Looks like they chopped my frame and put a heavy duty swingarm on for that 4DL raised the coolant tank and put bat under the seat. Thats why I asked cause surely the 4 wires from the engine are the same or do I have to change the flywheel coil bit of forget its name now. I think i'll give it a bash as I got to remove the engine anyway if the mountings are the same and it wires up maybe I can put a DT rear sprocket on.
Food for thought ive got to get the energy to get at it first i'll look over that cdi wiring diagrams thing you shared and go from there just hope the exhaust mounts dont throw it out of whack.
I'm hands on so once got all the parts in sight i'll hopefully make sense of it all feel free to leave suggestions etc like I said before wish I had someone here to help me out going to be fun though so hopefully will give me more incentive.
