Posts
9
Joined
6/11/2015
Location
Council Bluffs, IA, USA
Edited Date/Time
6/12/2015 7:23am
Just joined as my son and I have started getting into riding and working on dirt bikes the last couple years. Figured I use the forums enough I should join.
I've got what I think is an 84 rm125. I have next to nothing into it but I need a little help.
When I first got it, it would run if kept revved into the powerband, was told the top end was just done and bored .50 over and it does have some power. Since I couldn't get it to idle I pulled the carb and ran it through my little ultrasonic cleaner. I got all the jets out but the pilot and hoped after soaking it or running in the ultrasonic I could get it freed. No luck, a shop even tried (for free) to use an easy out....the jet was also completely clogged so I found the smallest drill bit I could and just drilled through so fuel could pass. It was too much (as I expected). It idles now but won't really rev at all.
I probably have to replace the carb at this point (it's now lost in my dad's garage
) figured see what kind of upgraded carb might be good. Seems a 34mm or 36mm flat side Mikuni from a 90s rm is what some guys have done. Does anyone have any suggestions? A 34mm seems good but since it bored would a 36mm be even better? We aren't super aggressive riders but it is fun to go fast, we also do a little trail riding so low end is nice.
Thanks!
I've got what I think is an 84 rm125. I have next to nothing into it but I need a little help.
When I first got it, it would run if kept revved into the powerband, was told the top end was just done and bored .50 over and it does have some power. Since I couldn't get it to idle I pulled the carb and ran it through my little ultrasonic cleaner. I got all the jets out but the pilot and hoped after soaking it or running in the ultrasonic I could get it freed. No luck, a shop even tried (for free) to use an easy out....the jet was also completely clogged so I found the smallest drill bit I could and just drilled through so fuel could pass. It was too much (as I expected). It idles now but won't really rev at all.
I probably have to replace the carb at this point (it's now lost in my dad's garage
) figured see what kind of upgraded carb might be good. Seems a 34mm or 36mm flat side Mikuni from a 90s rm is what some guys have done. Does anyone have any suggestions? A 34mm seems good but since it bored would a 36mm be even better? We aren't super aggressive riders but it is fun to go fast, we also do a little trail riding so low end is nice.Thanks!
Here is a link to the specs and part numbers for your original carburetor.
http://www.alpha-sports.com/suzuki_parts.htm
At this point, you sound like there is nothing to lose.
Lonestar is right, bigger carb, more revs....
I read the old Mikuni carbs weren't that great and the newer (90s) Keihin makes a big difference, but maybe that's just top end. My main thought was since it's bored out it could benefit getting both low and top end? If I do get the seized jet out should I go with any jets other than stock or any good starting point ideas as far as jetting? I understand the basics and have rebuilt and been able to somewhat tune stock setups but haven't done any modding or dealt with bored out motors. Was told it's .50 over which seems significant.
Just one fool's (me) opinion!
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