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Post by michaeleakin on May 27, 2011 14:56:41 GMT -5
Hey Guys I just got a new scooter my first one. I did a PDI on it that was very through. Took me around twelve hours divided between two days. I have just completed my 300km oil and gear lube change. I was finally able to open it up and see what it would do. Some one followed me in a car and clocked me at 33 on the flat. I had no problem with that. It would however would not go over 8000rpm's. The deal that has me wondering is after i reached top speed in around 10 minutes it started sounding as if the exhaust was restricted and i lost most of my power. I eased way off on the throttle and in around a couple of minutes it would perform as well as it did when i first took off. Ever since then it has done the exact same way. Any words of Wisdom??
ME
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Post by Rebel on May 27, 2011 15:17:29 GMT -5
8,000 rpms is about the max to run it at, I wouldn't worry too much about 8,000. If you modify it to go higher and run it a lot higher you are asking for valve float and causing some serious damage.
Ways to get higher RMPs include going with lighter variator weights, and also going with a no rev limited CDI, but since you are hitting 8000, you probably already have that, it seems the limited ones usually top out at about 7000 - 7500 rpms.
By all means check out the exhaust, you can look for anything there that may indicate a restriction. Some people actually do find washers , welds ect closing off part of the exhaust. Some will drill out the muffler to de-restrict it. You can order high perf exhaust systems too.
One of the best way to get some better breathing is to port and polish the head, or order one already tricked out, I personally like the design on the one Enviromoto sells over the one Scrappy Dog sells, but check out both of them.
Do the head, exhaust and then check out the electronic fuel injection installation. If you make changes in the intake and or exhaust you always need to make sure you are not running too lean or you can burn your valves.
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Post by Rocketdog on May 27, 2011 16:49:10 GMT -5
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Post by Rebel on May 27, 2011 17:44:24 GMT -5
How about welding a pipe nipple on the exhaust pipe so you can just screw the B&S muffler on?
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Post by Rocketdog on May 27, 2011 17:54:42 GMT -5
Sure man. That sounds good.
RD
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