87 GN250J help

  #1  
Old 01-12-2008, 09:12 PM
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Join Date: Jan 2008
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Default 87 GN250J help

Just bought this bike non-running, did a carburator clean, put it back together. So the bike starts, but only on full choke and if you even move the choke the bike dies. The other thing is that when you have it idling, and you hit the throttle it boggs down or dies.
Also if anybody knows any wwebsites where there is a pdf. manual free that would be helpful. Any other carburator tips are much appreciated too.

Thanks,
Colton
 
  #2  
Old 09-29-2008, 12:03 AM
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Posts: 49
Default RE: 87 GN250J help

Hi,

Are you sure you got the carbs really, really clean? Is there rust in the tank? It sound like you have an air leak in the intake system. Make sure o-rings and carb boots are sealed. Make sure there are no leaks in the airbox. Check my website for links to numerous manuals.

Thank you for your indulgence,

BassCliff
 
  #3  
Old 10-01-2008, 11:48 PM
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Default RE: 87 GN250J help

Okay so now the bike is running.. like 5 carb cleans later.. The problem now is that when you get up into the high RPMs it sputters.. I dont know if its a fuel problem or what.. it seems to get plenty and we spent alot of time with the floats.

Any help is much appreciated

Thank you,

-Colton
 
  #4  
Old 10-02-2008, 01:30 AM
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Default RE: 87 GN250J help

Hi,

Let's hope it's not coils or something equally as expensive. Are your using a fuel filter? I try to keep my gas tank and carbs clean so I don't have to use one. If you are using a fuel filter, make sure it's for gravity fed motors, like a lawn mower fuel filter. Most fuel filters are for systems with fuel pumps and are to restrictive for gravity-fed use. Of course, if your bike has fuel injection, then never mind.

The symptoms you describe could be caused by bad plug caps, plug wires, or the spark plugs themselves. It could be something else electrical, weak r/r for example. First, I'd check and clean every electrical connection and ground on the whole bike, from head light bucket to tail light. These older bikes tend to get corroded a little. [X(]

Have you checked the timing lately?

Sorry this is such a process of elimination. That's the way it is sometimes with these older bikes.

Thank you for your indulgence,

BassCliff
 

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