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rpms jumping up to 4000 when throttle closed ?

  • Thread starter Thread starter seanarthurmachado
  • Start date Start date
S

seanarthurmachado

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I registered and plated my new to my Suzuki gs850 (1979). I refilled the leaky back tire to try to ride to the shop and have replaced. I managed to start it let it warm and is acting weird. Sometimes full choke does nothing other times idles at 2000. Tried to get it back in the shed and it would only stall when trying to move or I would need to play with throttle to keep running. With throttle closed would idle to 4000 rpms then drop. Can anyone advise ?
 
If this is a bike that is new to you, have you done the required maintenance, specifically valve adjustment and carb cleaning?

A rising or hanging idle is usually attributed to a lean mixture. Could be clogged jets in the carbs or leaks in the intake tube o-rings.

Good luck with a shop that will remove your wheels to change the tires. At the very least, you should remove your wheels yourself and just take them to the dealer.

.
 
It looks like I should start doing the maintenance on it now then.

I was thinking I could get the bike ridden at least on the way to the bike shop for the tire... (Time saver...as the bike did not have a center stand when purchased, I need to have the shop special order the pins for the center stand I ordered off ebay to be connected to the frame.)

Once I get the center stand on there I can try to muddle my way through the rest of it (remove the rear wheel, bring to shop and purchase/mount tire on the rim, replace rim on bike.

That will keep the bike from falling over again (if the rear tire goes flat the handlebars need to be turned or the bike falls over on the right hand side, the kickstand seems to hold the bike almost upright)

after that I will have to try and muddle my way through removing the carbs, cleaning them out and reattaching, then valve adjustment, carb sync.
 
Let me know when you get the centerstand attached.

I can help with all the rest of that stuff. :-\\\

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seanarthurmachado said:
It looks like I should start doing the maintenance on it now then.
Click to expand...

This is probably my favorite forum on the board. I get a huge kick out of the carburetor questions. Yes, you should attend to the long-overdue maintenance items first.

after that I will have to try and muddle my way through removing the carbs, cleaning them out and reattaching, then valve adjustment, carb sync.
Click to expand...

Actually, the first bit of maintenance should be adjusting the valves. After that, check the compression. If that is OK, then work on the carbs and/or exhaust.
 
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