ttr125 vs. kx,cr,yz85

grant40k said:

hello people

i was wondering why so many of you supermoto mini riders go with a ttr125? The kx, yz, and cr are all reeeealy fast bikes and you can run them almost compleatly stock. a rider in the supertt circuit who placed second runing was 1.12 lap times on a husky 450cc and gess what that was the average lap time for the 85cc two stroke class. plus most of you ttr riders use are supension so why not just use the whole bike?

thanks for your help
#124

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First, you need to get out of the house more often (6+ topics in the last few days) Second, some of us that race are limited to cc sizes 4 stroke-wise. In the TMGP, the largest legal 4 stroke is 125cc for ins. reasons. Me, I just like the four stroke better, as it has proven more reliable in the endurance racing that I do than the 2 strokes. That, and I wanted to do something different, as no one in my club had a hogged-out CRF150 that could compete with the 65cc two stroke gp bikes, so i built one. The ttr125s are also a little slower, and more forgiving than the 85cc bikes. They are also a little smaller. The list could go on forever, but that's my take.

grant40k said:

you say that the 4strokes are more reliable but have you ever tryed to rebuild a top end on a 4 stroke. almost all repairs on a 2strokes are quick with two people.

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Yes, but the repairs aren't as frequent, and you don't have to "rebuild a top end" unless something breaks. Of course, the motors do need freshening up every season, to every other season. I sent my motor back to EO for a 175 kit, and there were no signs of wear, although a valve spring did break. I have been racing mine for a season and a half, other than the valve spring it has run flawlessly. If I was running a two smoker, I would have gone through several top ends, and probably a crank, by now. One of the big reasons why I win is 2 stroke attrition. For the most part they are not as realiable as the 4s for endurance racing. And I don't have to do a tear down after every race. Keep in mind, I am talking about endurance racing, 6 hours so far this season, and the wear factor is a much bigger issue for the two strokes. All I do is change the oil and go.

tbone said:

You said TMGP max cc is 125 and then went on to talk about your 150 then 175 cc.. How are you legal?

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I race in the CMRA mini endurance series
Formula 5

But I have raced several events with the TMGP on a different bike.