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Update: Still no engine speed over 2K RPM

  • Thread starter Thread starter egent
  • Start date Start date
E

egent

Guest
I replaced the fuel line this morning to remove the fuel filter from the bike. Started the bike on choke after putting the bike back together, when I turned off the choke bike would idle at about 1100 rpm, I could rev the engine to about 2K. When I would release the throttle, engine would drop to about 1500 rpm then slowly work down to 1100 again. Any other suggestions would be greatly appreciated.

For those not familiar with my current plight, here is the thread:

http://www.thegsresources.com/_forum/showthread.php?t=124521
 
Sounds like your carbs are not getting enough fuel. Maybe a petcock issue? Pull off the lines and check the petcock function. Also make sure your tank is properly venting. Search function will turn up lots of different threads on how to check these items.

Good luck.
 
If you have access to an igniter try to switch them out. (Not to light the bike on fire but the ignition igniter)
Do you have an electronic advance or mechanical.
 
Test update

Test update

Ok, after seeing the first post and doing a search I tried to remove the fuel cap and run the bike. I started the bike, and this made no difference. I then put the petcock on prime from run, again could not rev the engine over 2k rpm.

When you say try replacing the igniter, do you mean the CDI unit? If so, is there another way to test, as I don't have access to one other then the one of the bike.
 
bump

bump

Still trying to find out what this issue is. So I am trying to get this post on the first page.
 
If it only runs while idling, or with the choke on, maybe all the other carb circuits are clogged?

Main and needle jets, lots of tiny passages can get gooped up.
 
tkent02 said:
If it only runs while idling, or with the choke on, maybe all the other carb circuits are clogged?

Main and needle jets, lots of tiny passages can get gooped up.
Click to expand...

Would something like that start out as intermittent? As I said in the original post, it started this bogging intermittently, it would bog down while riding along, or when starting from a stop. Then Sunday after an initial bogging when starting a charity run, the bike ran fine the rest of the day, no issues at all. Next morning it was fine going to work, but at lunch it started the bogging down again, and has not been able to run above 2k rpm since.

I removed the fuel filter, per suggestions in the first post on this issue. This seems to have made no difference. I tried without the fuel cap on the bike to rule out the tank vent being the issue. I tried the petcock on both prime and on, this made no difference either. One thing I didn't try was to disconnect the vacuum line from the petcock and plug it to prevent lean running while on prime. I will try that tomorrow I guess along with any other suggestions I can get from this posting.

Again, for those not up to speed, the bike is an 82 gs1100gl 25k miles, replaced wiring harness , fuse box and starter clutch/rotor assembly. New parts include stator, both handle bar switches and r/r. Bike was bought in November with 23.5k on the clock.

Again I want to thank everyone for their help.
 
lose of power

lose of power

If you have the advance spark counter weights,remove the right cover and remove the spark generator plate and check to see if you can spring the weights. Rust from condensation can freeze up the pivots and springs.They should spring back and fourth.
Hope this helps. Dirty carbs
 
cmart45 said:
If you have the advance spark counter weights,remove the right cover and remove the spark generator plate and check to see if you can spring the weights. Rust from condensation can freeze up the pivots and springs.They should spring back and fourth.
Hope this helps. Dirty carbs
Click to expand...


I can't tell, does my model have a machanical advance, or is it built into the CDI unit( labeled 1 in picture)

http://www.bikebandit.com/houseofmotorcycles/showschematic/m6005sch264956
 
Nope you have an electronic advance.
I would check the igniter next.
 
For the heck of it, put in some Seafoam :-D. Solves a lot of problems if you havent already done that.
 
How long has it been since you have synchronized your carburetors?
 
chef1366 said:
Nope you have an electronic advance.
I would check the igniter next.
Click to expand...

When you say igniter, are you talking about the "black box" of the ignition system? What is labeled 1 in the fiche posted above?

Is there a way to go about testing the unit? I don't have an other one currently on hand to just swap out as a test, and at $400+ I am not going to buy one if I don't know for sure that it is no good.
 
Johnny K said:
For the heck of it, put in some Seafoam :-D. Solves a lot of problems if you havent already done that.
Click to expand...

I have been putting seafoam in the gas since I bought the bike in November. So if anything I am thinking that the bike might have been adjusted to run with partially blocked ports that have now opened back up.

Schweisshund said:
How long has it been since you have synchronized your carburetors?
Click to expand...

I got the bike in November, it was running fine when I bought it, at least till it starting blowing main fuses due to bad wiring. I have been dealing with electrical hell since January, followed by the starter clutch bolt shearing off gouging the rotor. So I have never done anything with the carburetors other then put seafoam in the fuel.
 
Update

Update

Ok, I pulled the vacuum hose from the petcock, started the bike. Made no difference to the way the bike as been running, other then it is going back to intermittent. I would be able to get the bike to rev though the RPM range, but then it would bog down and max out 2k - 3k. I also checked the connections to the CDI, they seem to be tight.

Does anyone know if a way to test the CDI other then just swapping out the unit? I don't have $400 to buy a new unit, and going to a bone yard doesn't guarantee a working unit.
 
bump

bump

Since no one has answered the questions back, I thought I would bump this back to the first page to get noticed again.
 
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