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05-09-2007, 08:58 PM
| #1 (permalink) |
| Newbie  Join Date: May 2007
Bike: 1980 RM 125
Location: Crystal River, FL. good ol' USA
Posts: 16
 |  RM 125 carb issues.
Hey, im the owner of a 1980 RM 125. just recently ate the piston and had to repair a few things. thats all done, and the bike is broken in...but the bike has been running really rich with fuel, always has, but it seems a lil' worse now, and might as well fix it since the engine is all in good order now. the mixture ratio is 32:1, which is even more lean than the 20:1 ratio that the clymer book for my bike suggests. I was wondering. does overboring the engine change the dynamics of the carb? I was snooping around the nature coast power sports website and noticed that there is more than one type of jet sets for my carb. i was thinking, are the other jets for various over bore sizes? I have re-adjusted the floats to cut off fuel sooner and it still loads up it seems. I am using good pre-mix oil and gasoline with a 93 octane rating. not the best...but pretty good. maybe i need to adjust the throat needle? im not the sharpest tool in the shed when it comes to tunning a carb...but i can find my way around. any help you can offer would be great. thanks for your time. ~nick |
