Clinician
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Post by styxfan on Mar 23, 2015 20:46:25 GMT -6
Long story short, the old carb had some idling and stalling issues as well (no matter were the A/F and or idle was set, it would stall when slowing down or idling. Basically opposite of what this new one is doing). I had someone work on it for me, but couldn't solve the problem, so basically it was cheaper to try a new carb than to keep paying them their labor rate.
Honestly I figured it would be easiest just to put a new carb in. I guess I was wrong.
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Post by Alleyoop on Mar 23, 2015 21:04:54 GMT -6
Long story short, the old carb had some idling and stalling issues as well (no matter were the A/F and or idle was set, it would stall when slowing down or idling. Basically opposite of what this new one is doing). I had someone work on it for me, but couldn't solve the problem, so basically it was cheaper to try a new carb than to keep paying them their labor rate. Honestly I figured it would be easiest just to put a new carb in. I guess I was wrong. The symptoms you describe here is a CLASSIC case of valves needing to be adjusted. When the Valves get tight what happens is the motor looses compression and has a hard time holding the IDLE and will usually die when coming to stops unless you keep on twicking the throttle. So I would adjust the valves on the motor, exhaust to .006 inchs and the intake .005 or .004 inchs. Many will try and compensate for the valves being tight by adjusting the carb and idle but as it gets worse that will not help. Then the valves get adjusted and now the carb has to be re-adjusted now that the valves are set. Alleyoop
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Post by styxfan on Mar 24, 2015 6:38:21 GMT -6
Thanks for all the info. I certainly have a few things to check this weekend. I've seen that the exhaust valve can be a pain to get to, so not looking forward to that, but will give it a try.
I'll update the thread after I've had the opportunity to work on it again.
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Post by styxfan on Mar 24, 2015 12:14:46 GMT -6
Does anyone know what the valve nut (for tightening the valve after setting the gap) size is and is the top squared or does it have a slot (like for a flathead screw driver) on the mc-54-250B valves?
I have access to a valve wrench, but I'd like to confirm that it's the right size.
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Post by Alleyoop on Mar 24, 2015 12:21:19 GMT -6
They are usually 9mm. But if you don't have one just use a adjustable wrench no biggy. The adjusting stud is squared so just use your hand or pliers to hold it when tightening the nut. Now before you button it all back up ROTATE the motor over a couple of times and RE-CHECK your gap. If you adjusted the exhaust to .006 try to fit a .007 same with the intake try to fit the next higher gap and it should not fit. Alleyoop
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Post by styxfan on Mar 24, 2015 13:32:11 GMT -6
Alrighty, Got it. I may just put my old carb back on after the valve adjust and see how it is. Like you said, maybe it was the valves all along. I'll up date the thread after the weekend.
Thanks again, keeping my fingers crossed!
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Post by styxfan on Mar 28, 2015 9:58:51 GMT -6
Adjusted the valves (.004 in/.006 exhaust) and still had stalling issues with the new carb. Put the old carb back on and after a few adjustments it will start, idle and accelerate without stalling. Took both carbs apart this morning and noticed that the main jet in the replacement carb was smaller (110) than the jet in my original carb (116). Get it wasn't getting enough gas after all. Sadly the weather here will barely reach 30 today, so I haven't put the original back in yet, but I feel pretty good that after I get it in and make a few adjustments, It should be good to go. Seller won't let me return the new carb since it's been installed, so I guess this was a $40 lesson. Really not to upset about it though, as I learned a lot during the whole process. Highest thanks to Alleyoop, I appreciate all your input and guidance. Next issue I have that I can't figure out, I'm coming to you first. storage.proboards.com/3059616/i/YI0E8joKBIpZl0tLyyi7.gifjavascript:addS("http://www.jr-richscooterdoc.com/XsmileP/X10A.gif","%20 %20")
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Post by Alleyoop on Mar 28, 2015 10:42:26 GMT -6
Fantastic, if you would have swapped the jets from the old to the new it would have also cranked up. GOOD JOB, but at least you have a spare carb if anything goes bad on the old one. Just remember if you do swap carbs swap the jets from the old carb. Alleyoop
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