IT175 dies unless choked - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 07-06-2005, 01:19 PM
KJ175
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IT175 dies unless choked

My IT175 has an odd problem - it seems to fuel starve unless the choke is on. I pulled the carb apart and all the jets look clean. It will run great for a few seconds, then die. If you hit the choke you can save it in mid-death. Sometimes you can save it by cranking the throttle open. I don't see any fuel restrictions, and the fact that it runs with the choke open pretty much eliminates that as a cause anyway.

Anyhow, I'm stymied and now looking for a replacement carb. This one is missing one of the float posts anyway and because of that will occasionally dump fuel on the ground.

Anyone have any idea how I can identify the carb on this bike? It is a Mikuni, and is stamped with a JW2 00 in one spot and a Z / 9 in another. Looking those numbers up on the Web bought me nothing. It looks like these carbs are more apt to be identified by the bike they came off or by the throat size (like 34mm).

Any help either fixing the current problem or finding a replacement carb would be greatly appreciated!

KJ
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post #2 of (permalink) Old 07-09-2005, 04:32 PM
Yamaguy
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Re: IT175 dies unless choked

I'd contact Sudco or another Mikuni distributor and get an aftermarket one. The guy that works for Mikuni USA was Joe Minton of Minton Mod fame, he perhaps can help you as well. I don't see the year of your bike, so I can't tell for sure, but my guess is somewhere between a 32 and 36mm Mikuni is what came on it. You may also want to check your reed valves, and look for a vacuum leak. usually, vacuum leaks show most at low rpm/throttle opening. that's where I'd start looking as a new carb may not fix it. squirt WD-40 at every joint, including the seal behind the magento whaile the engine is running, if it speeds up, then you found it.
Let me know if I can look anything up for you....
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