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General Minitrail Talk
Modifications
Sticking a Honda Hot Cam (or DRATV Mini Monster Cam) in a stock 3-speed CT70
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<blockquote data-quote="fatcaaat" data-source="post: 150085" data-attributes="member: 1656"><p>These engines, are for sure, bulletproof. But I'm thinking about what you are asking it to do. You are looking to run it on a 35mph road, 40+ or so mph. Essentially, you are looking to run this bike, max speed (not cruising speed) for a period of time on this road. Other way to think about this, you are going to run this engine flat out in the redline. I would have to think that would be very abusive, even to this engine, to run it at like 9000+rpm for extended periods of time. I'd say that if you wanted to get maximum life from a stocker (or even with your cam) that your cruising speed would be no more than 35mph and I might even say its closer to 30. Running it ragged the fastest it will go will absolutely shorten the life of everything inside that motor (except maybe the transmission gears and non-moving parts)</p><p></p><p>I had a kid purchase a chinese 70 pitbike from me...one that was in excellent shape and the motor was basically new. He was going to use this bike to run up and down a 6 mile stretch of a paved path to and from his girlfriends house. I dialed it all in perfectly and fit it with a quiet exhaust and jetted it so it was excellent. We put a bicycle speedometer on it so he could see how fast he was going. </p><p></p><p>About 2 days later, he brought it back to me telling me it won't run. I asked him what happened and he told me it quit on the 3rd trip. I asked him about how he was riding it and he told me he had it pinned...for pretty much the entire trip in both directions. ON the third trip back, it floated the exhaust valve and kissed the piston. I took it apart and replaced the valve for him free of charge (it took less than an hour) and I told him that the bike's cruising speed was about 30mph and if he went any faster than that it would happen again and I would charge him to fix it. He texted me about 6 months later telling me the bike was still running perfect, making about 3 trips a day...that's 48 miles a day on it. He also told me that he never runs it faster than 30mph (this one is even a 4-speed). </p><p></p><p>The point is, that anything you run above 70% of max speed for extended periods of time will dramatically increase wear/tear and reduce longevity of an engine.</p></blockquote><p></p>
[QUOTE="fatcaaat, post: 150085, member: 1656"] These engines, are for sure, bulletproof. But I'm thinking about what you are asking it to do. You are looking to run it on a 35mph road, 40+ or so mph. Essentially, you are looking to run this bike, max speed (not cruising speed) for a period of time on this road. Other way to think about this, you are going to run this engine flat out in the redline. I would have to think that would be very abusive, even to this engine, to run it at like 9000+rpm for extended periods of time. I'd say that if you wanted to get maximum life from a stocker (or even with your cam) that your cruising speed would be no more than 35mph and I might even say its closer to 30. Running it ragged the fastest it will go will absolutely shorten the life of everything inside that motor (except maybe the transmission gears and non-moving parts) I had a kid purchase a chinese 70 pitbike from me...one that was in excellent shape and the motor was basically new. He was going to use this bike to run up and down a 6 mile stretch of a paved path to and from his girlfriends house. I dialed it all in perfectly and fit it with a quiet exhaust and jetted it so it was excellent. We put a bicycle speedometer on it so he could see how fast he was going. About 2 days later, he brought it back to me telling me it won't run. I asked him what happened and he told me it quit on the 3rd trip. I asked him about how he was riding it and he told me he had it pinned...for pretty much the entire trip in both directions. ON the third trip back, it floated the exhaust valve and kissed the piston. I took it apart and replaced the valve for him free of charge (it took less than an hour) and I told him that the bike's cruising speed was about 30mph and if he went any faster than that it would happen again and I would charge him to fix it. He texted me about 6 months later telling me the bike was still running perfect, making about 3 trips a day...that's 48 miles a day on it. He also told me that he never runs it faster than 30mph (this one is even a 4-speed). The point is, that anything you run above 70% of max speed for extended periods of time will dramatically increase wear/tear and reduce longevity of an engine. [/QUOTE]
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General Minitrail Talk
Modifications
Sticking a Honda Hot Cam (or DRATV Mini Monster Cam) in a stock 3-speed CT70
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