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Higher RPM problems.

  • Thread starter Thread starter SuzukiGS
  • Start date Start date
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SuzukiGS

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Hey guys, so the problem I'm having with my bike is something in the higher RPM's. I can start my bike up no problem and run it at idle and up to about 4 grand and have no issues at all. Yet when ever I go into my higher RPM's it will choke out and die if I go fast into it or it will start to pop and sound like it's back firing if I just roll into it. Also Yesterday while I was running it I heard like a belt sound or something?

I've cleaned the tank, cleaned the Petcock, and checked all my gaskets. Whats the issue?
 
SuzukiGS said:
Hey guys, so the problem I'm having with my bike is something in the higher RPM's. I can start my bike up no problem and run it at idle and up to about 4 grand and have no issues at all. Yet when ever I go into my higher RPM's it will choke out and die if I go fast into it or it will start to pop and sound like it's back firing if I just roll into it. Also Yesterday while I was running it I heard like a belt sound or something?

I've cleaned the tank, cleaned the Petcock, and checked all my gaskets. Whats the issue?
Click to expand...

Carburetors.
 
Yes it's stock. What points? And what in the carbs do I need to look at?
 
SuzukiGS said:
Yes it's stock. What points? And what in the carbs do I need to look at?
Click to expand...

If it's never been modified to an electronic ignition then it has "points" under the small round cover on the right side (sitting on the bike). They have to be gapped correctly, and replaced periodically.

TON of things could be wrong on the fuel side, clogged carb passages from sitting and not running (even for just a month or two), petcock going bad, clogged filter on the petcock, kink in the fuel line, fuel line running "uphill".

It's going to have to be a process of elimination. If you've never serviced your points (78's predate electronic ignition on these bikes), that might not be a bad place to start.
 
doctorgonzo said:
TON of things could be wrong on the fuel side, clogged carb passages from sitting and not running (even for just a month or two), petcock going bad, clogged filter on the petcock, kink in the fuel line, fuel line running "uphill".

It's going to have to be a process of elimination. If you've never serviced your points (78's predate electronic ignition on these bikes), that might not be a bad place to start.
Click to expand...

I agree I think its points. In my personal experience, the "normal" carb problem, for me any way, is clogged pilot circuits, which works the opposite way: Nothing at low rpm and will run at high throttle openings. I have had points wear until they don't open for a long enough time (dwell) to make a good spark. It shows up way more at high RPM/high load. I have had condensers act that way too.
 
It has electronic ignition and a Kicker, so would points still be a problem?
 
SuzukiGS said:
It has electronic ignition and a Kicker, so would points still be a problem?
Click to expand...
That means you don't have a stock ign, which is fine.. I would just check and make sure the timing advance is working properly
 
Because it has an electronic starter. Unless I'm completly confused and wrong wouldn't an electric start mean an electronic ignition?

How do I check the timing advance?
 
Sounds like fuel starvation to me.
Poor air flow through the filter will also cause a sudden lack of power but your description sounds like lack of fuel.
I'm guessing it will rev well above 4K as long as it's in neutral but once in gear and under load, it dies/hesitates.
 
If you take off the round cover at the right front of engine and it looks something like this you have points
points.jpg
 
SuzukiGS said:
Because it has an electronic starter. Unless I'm completly confused and wrong wouldn't an electric start mean an electronic ignition?

How do I check the timing advance?
Click to expand...
I made my previous reply and then noticed this post.
You made it sound like the points were replaced by a newer ignition but that may not be the case. Electic start has nothing to do with the ignition.
I still think it's fuel starvation. Your bike reaches full advance timing by 2,000 rpm's so I doubt your problem is advance timing related because you say the problem starts at 4,000 rpm's. Points however, need attention on a regular basis if you ride often. They get dirty and pitted. They loose their gap.
Take off your points cover and show us a pic or describe what you see. Sometimes the mechanical advance can get sticky/rusty and a shot of cleaner and lube will get it moving smoothly.
 
No, in neutral it has the same issue. I've cleaned the airbox and filter as well.
 
Hey chef. How you doing tonight? I gotta get my butt to bed so I'll leave this guy in your capable hands. 'night.
 
Okay, sorry, I'm still new to this and only know a little about engines. Really only the basics. Tomorrow if I have time I'll try and pull the cover off and look at the points. Now you were saying it was the cover on the right side of the engine? The one that says DOHC on it right?
 
SuzukiGS said:
No, in neutral it has the same issue. I've cleaned the airbox and filter as well.
Click to expand...
Allright. (Yawn)
Still could be fuel related. The load/no load rev check will often show classic fuel starvation but you can still starve for fuel with no load.
But, the ignition timing/points is a basic maintenance item anyway and should be checked. Also, it's quicker and easier to do than a carb cleaning.
 
Something else I noticed today was on the right side if the engine there is a cap for something right by where is says DOHC and down where the clear hole is that says f F and L it has no fluid in it whatsoever. would that cause problems? And what is that fluid?
 
SuzukiGS said:
Okay, sorry, I'm still new to this and only know a little about engines. Really only the basics. Tomorrow if I have time I'll try and pull the cover off and look at the points. Now you were saying it was the cover on the right side of the engine? The one that says DOHC on it right?
Click to expand...
Yes. Right side as you describe. Let us know what you got or show a pic if you like.
 
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