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Old 03-16-2016, 01:41 PM   #21
98yamaha
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Quote:
Originally Posted by rob78 View Post
do you have the 4th gear drum, what gearing are you running and what carb/jetting? when you felt you had no acceleration

I have ridden a tak 125 with a roller rocker head, their very nice and was quite completive in F6 but if I'm not mistaken the kit is discontinued. I was debating on using that kit myself at one point.

you could use a 54mm piston and stroker 55mm crank to get you to 128 or 60mm piston & stock crank to get 126. wisco has a 54mm piston and TB has a 60 for the stock head. At minimum you need to either port the head with a 24/26mm carb or get a different head with 24/26mm carb. There are no kits you can buy that will be good for F6, you have to piece it together.

If you want any TB parts talk to Alan, him and his dad sell TB parts
I don't have the 4th gear shift drum, but plan to put it in when we open up the cases.
I honestly can't remember what jets I had in the stock carb back when it was a 110 and was bogging. When I bored it, I put a VM26 carb on it as well, with a BBR race cam and did a little bit of port work on the stock head. When it blew up in the race I was running a 22.5 pilot and a 165 main. I tried going to a 175 main to help the slight bogging we were having, but that made it worse so I switched back to a 165 and leaned up the air/fuel screw a smidge and it seemed to help some.
I talked to a guy at Fast50's that told me he could order up the 125 Takegawa kit, so that's what I was thinking of doing. http://www.fast50s.com/i-18479450-ta...m26-124cc.html If it's discontinued, I will have to go another route. Would you recommend doing a stroker with a smaller piston, or sizing up the piston and keeping the stock crank? I was thinking the stock crank with a bigger piston would be better suited for road racing, but maybe not?
I'm really trying to avoid shattering a piston twice. I'm not sure if the Takegawa kit would be any better for that or not.
Thanks,
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Old 03-17-2016, 05:50 AM   #22
rob78
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where do you want the power? low end, mid or high in the rpm range?
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go ahead and cry so I can use the tears as lubrication to stick it in you
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Old 03-17-2016, 09:16 AM   #23
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to be honest it just looks like heat sploded your engine. compound that with the bored cylinder removing material and i think you've found your answer, although not as complex as you might be looking for.

if you are unsure, send an oil sample out for testing and see if they can tell you anything about from that.
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Old 03-17-2016, 01:24 PM   #24
98yamaha
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I ended up going with one of the Kitaco 125cc kits that CHP still had in stock. I'm going to take my motor up there to have them do the work. I'm not super comfortable with splitting the cases myself, and don't have a lot of tools I may need to do that work anyways. Plus it will speed up the process significantly so hopefully I can make the Denton race.

I'll post a couple more pics of the piston and head on here. I didn't see any obvious signs of over heating on the piston, cylinder, or the head, but maybe someone else might be able to point some stuff out.
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