Brandon H.
Member
- Mar 26, 2009
- 199
- 0
julien_d said:I wouldn't expect the RPM to continue rising after you reach the spot where it hits the highest idle on the airscrew. Hopefully this is around 1.5 turns. As you continue to go out the idle may not really change, but going in from there should cause it to get lower and lower and eventually die.
Anyhoo, my buddy has a yz125 we just finished rebuilding. It behaves exactly the same as you describe your CR running. We haven't gotten much chance to look into it yet, but my gut feeling after riding it a bit is that it's wicked rich low through mid. Needle position changes didn't help much. We've got jets for it now but have been too busy working on the other bikes to mess with it.
Get you a range of jets, and check the carb out really well. I'd guess that float measurement is from the top of the float to the mating surface when the float valve is just closed. The service manual should tell you how? You can always attach a clear rubber hose to the carb drain and run it up beside the carb. When you turn the fuel on the level in the tube will show the level of fuel in the carb. A few MM below the mating surfaces should be fine.
Carb is spotless and reeds look great. I would like to run a leakdown test to check for airleaks, I need to find some threads on how to make one. I will pick up some exhaust packing this week.helio lucas said:http://www.procircuit.com/jettingspecs.htm#2000
some jetting specs from pro circuit may help...
to setup the float level on most of the comon carbs just get the marks on the float or the float arm parallel to the gasket surface of the fuel bowl :cool:
the manual should say how to measure the 15mm. may be in another chapter. if not, usually, is 16mm not 15, with upside down carb, from the top of the float to the gasket surface with the needle just closed.
before any atempt on jetting be sure that the exhaust packing is new and the engine don´t have any air leak. and the carb should be clean.
helio lucas said:sizes that small should not be for your carb but for mikuni. kehin uses around 50.
usually you can get the jets directly from honda dealer itself but they are more expensive. i do not live in america and i cannot help you very much on places to get jets but it seems sudco is a trusty source. also jd jetting kit seems to work very good from the reviews on the forum.
http://www.sudco.com/Carburetor01.html
http://www.jdjetting.com/xcart/home.php?cat=6
edit: is the power valve on the bike working?
KX_OUTLAW said:Why do you think it's too rich? Do you need the choke much on start up?
Usually a bog means it's lean.
I don't think 50 is big on a 125, I had to move up to a 48 in my 100 because of a bog exactly like you describe.
But nevermind all that, it sounds to me like something in the carb is dirty or clogged.
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