• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Firing before the cylinder

timebombprod

timebombprod

Forum Sage
Messed with bike today, put stock pilot jets back in, was dumb to put anything higher than stock when I just had an exhaust on. Anyways the bike was going really well, smooth, quiet idle. The throttle response wasnt that great but it did not have a hanging rev issue, eventually it just shut off and I thought maybe fuel was choking it and that's also why the throttle response wasnt so well.

I turned the idle screws out about a quarter turn from it originally being 2 turns out and didnt really change anything, had a bit of black smoke but was gone soon after. I put a bolt in the vacuum line at the carbs because I was gonna run it out of fuel before putting back in for the night so I didnt have possible gas sitting in my cylinders, and at one point the bolt shot out.

Heres the thing, I've had this inconsistent skip, and today it was gone, returned at one point but maybe once or twice, and left. I turned the screws out and it did it a tiny bit but now I'm thinking maybe it's because the bike is firing before it should.

Reasons why thered be a backfire before the cylinder?


I know I'm close, I'll link a video of today, this was before the idle screw turns and it just suddenly dying. But it gives hope that its gonna be done.

https://youtu.be/SnyaHIO1tpE watch the video you'll understand it is close to done.
 
Watching your video, it sounds to me that the engines is mis-firing on one cylinder. Which one?

Start engine and let it idle.... Then remove a spark plug wire. The engine RPM should go down if that cylinder is operating correctly.

If the RPM stays the same, that is the mis-firing cylinder..
 
melchiro said:
Watching your video, it sounds to me that the engines is mis-firing on one cylinder. Which one?

Start engine and let it idle.... Then remove a spark plug wire. The engine RPM should go down if that cylinder is operating correctly.

If the RPM stays the same, that is the mis-firing cylinder..
Click to expand...

I will as soon as I get some pieces shipped in. I like to believe I'm running on all 4 as of very recent. No gap in the idle, all 4 headers get hot. I have fuel air and spark but I'll checkover the carbs since they're already out.

I'll do that test forsure though, I've done it before and had a nice buzz go through my hand but it was because plug caps were worn completely.
 
The bike sounds alright. Gotta get on and butt (poor mans) dyno it to really know if the fueling and everything else is where it should be.
 
It seemed to pull fine and smooth I never gave it a hard throttle but I'd go through most of the powerband just making sure it would hold up to it. I guess I'll give it a real go and see how it acts. I dont think I'm missing kn anything and after watching a bunch if videos of gs650s idling I can say mine is one of the better ones. They never have a complete drone it seems but very close to it, always have a bit of a tick inbetween the idle. Maybe I'm wrong, but I'll be doing a steam test and riding it to see how it goes. Honestly when I rode it the other day I was very pleased with the results other than the idle climb but it wasnt nearly as high as it was and the sound was tons more bearable.
 
timebombprod said:
Messed with bike today, put stock pilot jets back in, was dumb to put anything higher than stock when I just had an exhaust on. Anyways the bike was going really well, smooth, quiet idle. The throttle response wasnt that great but it did not have a hanging rev issue, eventually it just shut off and I thought maybe fuel was choking it and that's also why the throttle response wasnt so well.

I turned the idle screws out about a quarter turn from it originally being 2 turns out and didnt really change anything, had a bit of black smoke but was gone soon after. I put a bolt in the vacuum line at the carbs because I was gonna run it out of fuel before putting back in for the night so I didnt have possible gas sitting in my cylinders, and at one point the bolt shot out.

Heres the thing, I've had this inconsistent skip, and today it was gone, returned at one point but maybe once or twice, and left. I turned the screws out and it did it a tiny bit but now I'm thinking maybe it's because the bike is firing before it should.

Reasons why thered be a backfire before the cylinder?


I know I'm close, I'll link a video of today, this was before the idle screw turns and it just suddenly dying. But it gives hope that its gonna be done.

https://youtu.be/SnyaHIO1tpE watch the video you'll understand it is close to done.
Click to expand...


Your bike has an electronic ignition. It is not adjustable. Back firing is usually due to excessively rich mixture. That would not be a pilot jet problem. It's a too large a main jet problem, or possibly clip position on the needle.
 
timebombprod said:
Messed with bike today, put stock pilot jets back in, was dumb to put anything higher than stock when I just had an exhaust on. Anyways the bike was going really well, smooth, quiet idle. The throttle response wasnt that great but it did not have a hanging rev issue, eventually it just shut off and I thought maybe fuel was choking it and that's also why the throttle response wasnt so well.

I turned the idle screws out about a quarter turn from it originally being 2 turns out and didnt really change anything, had a bit of black smoke but was gone soon after. I put a bolt in the vacuum line at the carbs because I was gonna run it out of fuel before putting back in for the night so I didnt have possible gas sitting in my cylinders, and at one point the bolt shot out.

Heres the thing, I've had this inconsistent skip, and today it was gone, returned at one point but maybe once or twice, and left. I turned the screws out and it did it a tiny bit but now I'm thinking maybe it's because the bike is firing before it should.

Reasons why thered be a backfire before the cylinder?


I know I'm close, I'll link a video of today, this was before the idle screw turns and it just suddenly dying. But it gives hope that its gonna be done.

https://youtu.be/SnyaHIO1tpE watch the video you'll understand it is close to done.
Click to expand...


Your bike has an electronic ignition. It is not adjustable. Back firing is usually due to excessively rich mixture. That would not be a pilot jet problem. It's a too large a main jet problem, or possibly clip position on the needle.

Also sounds like your carb synch is not right either.
 
I have the dyna on but no it's a short circuit that I've been having, I thought it was firing right next to the carb but I was wrong.

My mains are upsized but my problem was during idle speed to about 3500, I think it's fixed but ill find out today if my bike reacts any certain way.

The short circuit hides somewhere along my charging system I believe it has to do with my regulator, with the charging system disconnected I have no short circuit or nothing weird happening, I tested my stator but i still need to do the grounds test, but the first test showed fine, my battery is obviously fine, so it leads me to the regulator. If the regulator isnt throwing the short and the stator passes both tests then it would have to possibly do with the red wire that goes from the regulator to the fusebox.

Didnt want to start the other day it was so bad, next day with chrging system off it came right up no problem and stayed idling
 
You must log in or register to reply here.
Back
Top