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1989 TW california model. Run OK at operating speeds (maybe a little lean). When stopped or throttle let off initially it idles at high rpm but then slows down then sometimes dies. I have adjusted both the pilot jet and throttle stop but have not found the right combination. Any thoughts.

Thanks

Randy
 

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I'm new to the TW, but to me this sounds like a carb issue. Have you given it a good cleaning?
+1 Remove the pilot jet and pluck a wire out of a wire brush like a BBQ grill brush, hold the piece of wire with needle nose and reem the jet.Your lean at idle.
 

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I was told not to clean brass (needle) with anything harder than brass. Carb parts can be very sensitive to the size of their orifices and any size change carries with it the potential of forever altering how your carb will work. I don't remember the member but someone just made a thread about messing up his carb with aggressive cleaning (even though he was very careful) and having to replace it.
 

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Regarding the OP, have you ruled out air leaks?
 

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$13 for some tip cleaners? Go to a welding supply shop. I think I paid about $3 per set.
 

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i use a welding tip cleaner and haven't had any problems...able to be reused and fits any size hole...but i also don't clean the jet to death...soak it in carb cleaner and run the tip cleaner through the holes quick and done...



http://ww.sears.com/us-forge-welding-tip-cleaner-00802/p-SPM6354922207P?prdNo=1




$13 for some tip cleaners? Go to a welding supply shop. I think I paid about $3 per set.


Exactly what I use too. Been using the same tip cleaner for years and years. Trick is to use it just enough to knock out the crud or varnish and not "file" the oraface. The guys are right, your carb is fouled somewhere. A good doucheing and you should be good to go.
 

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In addition to what the others have mention (and more probable), but also check air filter if you haven't already.
 

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I use guitar strings. A buddy plays a lot and seems like he changed the strings every other week. I have him save the old ones for me. They are all different sizes and work great. Best of all they are free :)
 

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It certainly could be carb problems, but I'm with Retmotor, I would check for air leaks first. Could be a split in the intake boot. Closing the throttle suddenly produces more vacuum which could cause air to penetrate the split, producing a lean condition and high idle. If the split closes up soon after, jetting is restored to normal and the bike idles correctly. To check for this spray some WD40 around the intake boot. If it revs you found the leak. I hate to use ether or starting fluid, but that would work also. I always like to check the easy stuff first.
 

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if you're using welding tip cleaners make damn sure you don't remove any brass from the jet. otherwise you'll be doing more harm than good.
 

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if you're using welding tip cleaners make damn sure you don't remove any brass from the jet. otherwise you'll be doing more harm than good.
Agreed! The internals of most jets are hour-glass shaped. You do not want to remove any metal so use a cleaner to loosen up the crud and then just poke it without using to barbs on the tip cleaners!
 

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i had the same problem and came to find that the low speed jet had a brass plug that had not been drilled from the factory. i took the carb off and took it to pro motor sports and for $20.00 the drilled and cleaned it while i waited i took it home and put it back on the bike problem solved best $20.00 ive spent in a long time no more stalles at red lights. i think it may b worth looking in to good luck its no fun when your scoot dies all the time i hope this helps .
 

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^ You can pull that plug over the pilot screw with a dry wall screw or similar. Screw the screw into the plug a couple turns, then use pliers to pull it out. Not necessary to remove the carb either, but you will want to turn it for better access.
 
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