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Post by zoom on Aug 8, 2016 11:15:39 GMT -5
I found a gianelli exhaust for my scooter online, so i bought it, it looks nearly new, i fitted it to my scooter, and the speed stays at around 5-10mph, peaking at 15mph, while the RPM is on maximum.
It was well screwed onto the cylinder and the sound levels were fine.
What should i check to fix it? It seems it's either obstructed, else it's for 70cc and it is out of compression? the scoot works fine with a 50cc exhaust. will be glad for your help.
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Post by flyangler on Aug 8, 2016 15:19:50 GMT -5
If you have rpm's and are doing just ten to fifteen mph , it sounds like a transmission problem.
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New Rider
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Post by zoom on Aug 8, 2016 16:03:04 GMT -5
the transmission is ok because it works fine with the stock exhaust.
is it possible that i have to change the jet when i put on a new exhaust? because the jet should be doing more than 15mph, even if it is half of what the new exhaust needs, and it's only meant to be a 50cc exhaust?
it's something to do with the air ratio being disrupted by an exhaust change or the wrong exhaust resonance (it's making a vaccum at 70cc at the time of the 50cc explosion and erasing the compression and horsepower to 0.5 hp?) else if it's got some glass fiber stuck in it?
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Post by floridagull on Aug 8, 2016 17:27:08 GMT -5
Sounds to me as if you have an obstruction...  |
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Post by mrsunsett on Aug 9, 2016 2:35:33 GMT -5
the transmission is ok because it works fine with the stock exhaust. is it possible that i have to change the jet when i put on a new exhaust? because the jet should be doing more than 15mph, even if it is half of what the new exhaust needs, and it's only meant to be a 50cc exhaust? it's something to do with the air ratio being disrupted by an exhaust change or the wrong exhaust resonance (it's making a vaccum at 70cc at the time of the 50cc explosion and erasing the compression and horsepower to 0.5 hp?) else if it's got some glass fiber stuck in it? Hey there, my experience is telling me to say obstruction i rejetted my carburetor and found a tiny piece of dirt clogging holes in the carbs main jet... If ita not that.... im not sure Good luck |
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Post by badpumpkin on Aug 9, 2016 9:05:50 GMT -5
It's air, fuel relative. What comes out must be in relation to the amount of air fuel that goes in. How many mm is the exhaust pipe. I believe you should not exceed 20 from a stock 49 head. Othrs with more knowledge of flow ratios can articulate this better.
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