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Post by km4nxa on Dec 13, 2017 19:34:52 GMT -5
After rebuilding motor from crank up, scooter has ran okay. Not bad, not great. It's had a lean condition....same condition I think was the reason for having to put a new crank in. I've been running it very Sunday driver style, just get from point a to b without hearing the marble rattle noise, either spark knock or pre ignition (in time, no vacuum leaks, always run 93) Today decided to try remedy the issue. After the third new carb I took off the shelf, it was a noticeable difference to the good far as throttle response, idle, etc. Got about a mile down the road, it died. Looked down, fuel was pouring from the carb. There's a small vent tube about 2/3 up from bottom, on the right if your looking at it from the manifold side. That's where it's coming from. Is there a bad gasket or o ring that would cause that or anyone else ran into same issue and find a fix?
All the carbs are the $25 jobs from Amazon, Keihin is brand on them.
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Post by lostforawhile on Dec 13, 2017 19:47:48 GMT -5
25 bucks is a knockoff keihin, counterfeit, there is an entire thread on how to tell a genuine one, it sounds like your float is stuck,
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Post by lostforawhile on Dec 13, 2017 19:50:25 GMT -5
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Post by scooterted on Dec 13, 2017 22:29:49 GMT -5
Your float is most likely stuck. Giving you extra fuel covering up your lean problem. Also, unless i misunderstood the reason for the carb changes. It sounds to me like you should be swapping main jets (to larger ones to run richer) and not carbs. Excellent guide to carb tuning -> www.49ccscoot.com/faq/carbtune.htmlP.s. If i had an engine that pinged, expecially from a lean condition, i wouldnt run it until I Richened up the mixture. |
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Post by lostforawhile on Dec 13, 2017 22:42:29 GMT -5
A Keihin is a great carb, but there are a ton of cheap fake knockoffs
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Post by pinkscoot on Dec 14, 2017 11:14:00 GMT -5
Another cause of fuel pouring out of the carb is a hole in the float allowing it to fill with fuel and not float.
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Post by km4nxa on Dec 14, 2017 12:04:56 GMT -5
It's a knock off, sorry about that guys. Excellent read regarding carb tuning
The carb I'd been running forever doesn't have any adjustments without making them. I'd tried jet sizes from 78 to 94 trying to fix the original issue. 86 or 87 was about the limit before it would start running too rich. That's why I wanted to try one of these other's, thought maybe the original had an issue (about five years old, 4,000 miles ran through it, and a no name)
Should've ordered brand name carb when ordered the stroker crank.
The float was the culprit for the gas leak. That parts fixed. Gonna see now if it wants to fall on its face or not.
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Post by lostforawhile on Dec 14, 2017 12:13:15 GMT -5
When you can,get a genuine keihin,you'll have far fewer issues with it, look for an established seller, mine was from moped factory on ebay, and it's a real one, I don't know if they have more, they are now also selling a cheap knockoff I got lucky I guess,
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Post by km4nxa on Dec 15, 2017 13:11:50 GMT -5
Went ahead and ordered genuine keihin today. Hard to think out of all the new generic ones, not one will run right.
While working on it yesterday, took the nut off holding the clutch bell. Threads were bad, figured I'd replace it in meantime. Left heater on in building while gone to see if the twenty degree weather was partial problem of the carbs. Cranked it up when I got back, forgot to put new nut and clutch bell back on. Pretty sure the clutch springs are way over extended to work right at this point.
If it wasn't for problems, whether fault of myself like that or mechanical, I wouldn't know how to act.
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Post by tocoo on Feb 18, 2018 6:56:44 GMT -5
Went ahead and ordered genuine keihin today. Hard to think out of all the new generic ones, not one will run right. can you provide the link for this carburetor ? Are you happy with it and do you confirm it is genuine ? |
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