Time to switch carbs

beechjetdude · Post by **beechjetdude** » Tue Dec 13, 2005 12:51 am

I have had enough of walbros. I have a 72 400 and it has never ran good with the walbro. It has been rebuilt, but like everyone else the walbros dont run. So, I have a 34mm mukini carb that I would like to try. Would anyone have any idea how to spec the carb out. Like what jets to use, and what else I would need to do it.

:blink:

400brian · Post by **400brian** » Tue Dec 13, 2005 4:18 am

I have a 34mm Mikuni on a 340/5

I started out with a 250 main, was way too rich. Dropped down to a 230, and then a 210. That is closer, I have a 200 on deck if needed.
I'm not sure what I have in it for a pilot jet, 25 maybe? I had this all doucumented on the old list, but of course that is gone.

This is WAY leaner than say what a 340/22 Cyclone motor ran. I'm thinking they ran 350 - 400 mains.

You may find your situation different, proceed carefully.

I'm thinking of putting a Walbro on it.

beechjetdude · Post by **beechjetdude** » Tue Dec 13, 2005 8:47 am

Hey thanks Brian......On the 76 Cyclone 340, according to my high performance book by john deere they ran a #370 on the main,pilot was a #20, the throttle was a 2.5, needle jet was a Q-0, and the jet needle was a 6FL14 on the #2 position. I will try your suggestion. :ph43r:

beechjetdude · Post by **beechjetdude** » Wed Dec 14, 2005 11:46 pm

Well Brian I think I found the problem with my walbro. The meter lever was not set right. Now she works like she should. So long to the mikuni.

400brian · Post by **400brian** » Thu Dec 15, 2005 4:32 am

Glad to hear you found the problem. This stuff isn't magic, there is generally a solvable problem, just waiting to be found. If you can find it before you tear your hair out, your doing good