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Post by scooter on Mar 25, 2015 22:39:01 GMT -5
I have a cfmoto Fashion 250. I was working on the exhaust and, after a ride, I noticed my back tire and rim were too hot to touch. I was really worried about it so I wrapped the exhaust with exhaust wrap material and, while that seemed to keep the tire a lot cooler, it's still so hot that I can't put my hand closer than about an inch from it when it's running, and there is only about 3/4 to 7/8" from the pipe, coming out of the engine, to the tire. Should I be worried? Anyone else notice this on their 250's? Can the tire take the heat?
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Post by oldchopperguy on Mar 31, 2015 14:03:47 GMT -5
Scooter,
I've never encountered this phenomenon. After a long high-speed run, on a hot day, both my tires get pretty hot; too hot to comfortably hang onto with a bare hand, but it sounds like your rear is getting TOO hot.
Seems like the factory would not design in a feature that could lead to a tire failure, but it does concern me. I would try making a simple sheet-metal "heat-shield" large enough to block the exhaust header from the tire (maybe several inches above and below the pipe" to deflect the air from blowing directly onto the tire, just for safety.
I've never heard of this condition, and never heard of a tire blowing from exhaust heat, but still, it's something I would try to remedy, just for "peace of mind"... A simple little "paddle" of aluminum might add thousands of miles to the tire's life.
Just my thoughts,
Leo in Texas
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Post by scooter on Mar 31, 2015 16:22:38 GMT -5
Scooter, I've never encountered this phenomenon. After a long high-speed run, on a hot day, both my tires get pretty hot; too hot to comfortably hang onto with a bare hand, but it sounds like your rear is getting TOO hot. Seems like the factory would not design in a feature that could lead to a tire failure, but it does concern me. I would try making a simple sheet-metal "heat-shield" large enough to block the exhaust header from the tire (maybe several inches above and below the pipe" to deflect the air from blowing directly onto the tire, just for safety. I've never heard of this condition, and never heard of a tire blowing from exhaust heat, but still, it's something I would try to remedy, just for "peace of mind"... A simple little "paddle" of aluminum might add thousands of miles to the tire's life. Just my thoughts, Leo in Texas Thanks. I made a small heat shield for the header and it helps some. Then I switched mufflers with the other scoot and that didn't help. I upped the jet from a 110 to a 125 and that didn't help. I then switched carbs with the other scoot and that helped more, but still hot. I think the second carb has a 115 or a 120 jet in it. I am going to wrap the second exhaust like the first one, put on the heat shield, and go get some metal to make a muffler shield with. I have seen this issue from others online but no solutions. Thanks for your input. |
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Post by scooter on Mar 31, 2015 16:29:38 GMT -5
BTW I heard Dr Richard Carman has passed away, from the scooterdoc forum. Y'all might want to stop by if you knew him. |
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Post by novaraptor on Apr 20, 2015 14:37:52 GMT -5
Oh, and a little late to the table with this.. Your rear tire is properly inflated, right? If so, have you checked your plug to see if you are running lean? If no other solution, maybe an extension after the muffler to redirect the exhaust to the side. Doesn't sound right, definitely.
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Post by bandito2 on Apr 26, 2015 9:38:30 GMT -5
Question.... Both sides of the tire hot in the same way?
And the rim is hot as well?
Carb changes would seem to have negligible effect on tire temperature.
The most likely heat sources are heat from tire friction. Low tire pressure or heavy loading will allow the tire to squirm and heat will be generated internally.
Heat can transfer direct to the tire by contact with very hot roads.
Another big heat generator to the rim and tires would be the brakes because they generate LOTS! of heat from the friction of braking action.
Another source is from heat transfer through the rear axle from the transmission, drive line case & engine.
Make sure your brakes are not dragging. Be careful not to "ride" your brakes and make sure your parking brake is completely disengaged when riding.
In spite of the tire and rim being near the exhaust, the air space between them is a pretty good insulator; even more so with the bike moving. Heat radiating from the exhaust could heat up a localized area, when the bike sits still.
So, most of the heat on the rim and tire comes from direct contact with the heat sources. ie; internally generated heat from the friction of movement of the tire distorting, heat transferred from the brake disc to the rim or through the axle via the transmission and crankcase, or the tire in direct contact with hot pavement.
Heat from exhaust should be one of the least of your worries as far as tire/rim heat goes.
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