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My bike suddenly lost a cylinder

  • Thread starter Thread starter littleroot
  • Start date Start date
If it has been 6500 miles since your last valve adjustment, they are about 2500 miles past due. :eek:

If you have a valve that is just a bit too tight, it could mis-fire a bit at idle, but respond OK at higher speeds.

Is your bike easy to start when cold? Is it easier to start when warm?
Classic sign of tight valves.

.
 
Steve said:
If it has been 6500 miles since your last valve adjustment, they are about 2500 miles past due. :eek:

If you have a valve that is just a bit too tight, it could mis-fire a bit at idle, but respond OK at higher speeds.

Is your bike easy to start when cold? Is it easier to start when warm?
Classic sign of tight valves.

.
Click to expand...


When cold I choke it and it starts immediately. When warm I get same results without choke. That's all I have ever done. I'm not sure I answered your question. Should I try some other test? I am in the SF Bay area and have not owned the bike in the winter yet. As owner of the bike has never seen lower than 55 F degrees since I've owned it and always garaged.

Thanks for the reply
 
another photo

another photo

IMG_2689.jpg


Just a picture of the overall view and the coils.

Any more ideas? Do we think it is just a valve adjust and carb rebuild to fix?
 
Just a thought the carb thats not firing at idle maybe to rich which at idle just floods the carb at higher rpm the rickness isn't as much of a problem.
Is the #2 pipe cold at idle then warms up at high revs ? That would be a good indicator, Good luck.
 
Sounds like a plugged up pilot jet since it's not firing at idle but runs at higher speed. The compression indicates the valves are ok, although they should be checked soon. I'd pull the carbs and remove the pilots and look for junk in there. If you have rust in the tank it's very easy to plug a pilot.

Good luck.
 
Nessism said:
Sounds like a plugged up pilot jet since it's not firing at idle but runs at higher speed. The compression indicates the valves are ok, although they should be checked soon. I'd pull the carbs and remove the pilots and look for junk in there. If you have rust in the tank it's very easy to plug a pilot.

Good luck.
Click to expand...

Yeah I guess something got into the carb. The tank looks really clean inside, but anything can happen. There is no fuel filter. Shouldn't there be?
 
Sounds like you said there was fuel...I had the same issue with #1 cylinder...it was a clogged jet. Try pulling the carb and using a wire (pulled from a wire brush) to poke thru the holes in the main jet. Once I did this I ended up doing all carbs while they were out. Ran better then ever after I was done.
Good Luck,
John
 
Skunky said:
Sounds like you said there was fuel...I had the same issue with #1 cylinder...it was a clogged jet. Try pulling the carb and using a wire (pulled from a wire brush) to poke thru the holes in the main jet. Once I did this I ended up doing all carbs while they were out. Ran better then ever after I was done.
Good Luck,
John
Click to expand...

I really want to do this but I have no idea where the jet(s) are. And I am stuck at the moment wondering how to get the carbs off the bike and on a workbench because I do not know how to get the throttle cable off. My carbs are not stock so I think I need to post some pix and get advice. I did notice when the pods are off I see fuel is squirting OK. Is that the jets you mean or is it further inside somewhere?

Please let me know.

Thanks!
 
It is working!

It is working!

SqDancerLynn1 said:
It sounds like something pluged in the carb, you could try some seafoam in the gas to clean it out..
Click to expand...

Son of a gun: I kept putting more seafoam in her (read this thread for how much and when) and running the engine for a while on and off while gathering data Saturday and then today after just sitting all day while doing other things the #2 cylinder decided to work when I fired her up this afternoon. I don't have as much power as I used to but the #2 is now firing at idle!!!! :D

Now I can just hear a slight difference when I put on/take off the #2 plug wire while idling. I took my wife for a ride tonight and out for dinner - a great 23nd anniversary present for us both.

From reading all the posts from everyone trying to help me here I learned so much. I bet after I do a real carb cleaning I'll get all my power back and more.

THANKS EVERYONE!:D
 
Oh! and those carbs are NOT stock. It helps to tell us what you have...
 
If I was you, I'd ask if there is anyone near you who can come over and help you clean your carbs. At least just pull the rack and clean the jets in #2. It's not that hard really and it's easiest to have someone there who knows what they are doing and can show you. There is a really good write up on bikecliff's website about how to clean them though.
 
SqDancerLynn1 said:
Oh! and those carbs are NOT stock. It helps to tell us what you have...
Click to expand...

Yep, my bad. I could not remember that they we're called flat slides in my first post so I just called them "racing" carbs.

Later I did note they were "flat slides" but I do need to learn the model number as I think it is still not very descriptive (and I now upon closer inspection I should soon replace the intake boots so I better find out soon).

I remember I think someone calling them "RS flat slides" when I started a thread on them many months ago but that is all I know. I still need to find out what size.
 
mighty13d said:
If I was you, I'd ask if there is anyone near you who can come over and help you clean your carbs. At least just pull the rack and clean the jets in #2. It's not that hard really and it's easiest to have someone there who knows what they are doing and can show you. There is a really good write up on bikecliff's website about how to clean them though.
Click to expand...

Yep, I got TomMLC and a friend who is not on the group living near me, both of which I bothered quite a lot on Friday when the probelm happened. I gotta find a way to pay them back first!

Also need to find some intake boots before I bother and find out what other parts I might need for a rebuild before I take her apart...
 
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