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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> White spacer maybe? /cgi-bin/YaBB.pl?num=1155410909 Message started by Guido on 08/12/06 at 12:28:29 |
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Title: White spacer maybe? Post by Guido on 08/12/06 at 12:28:29 Okay, stupid question done to death, but here it is. May the carb gods be kind. Still chasing an intermittent backfire. Just got back from a 60 mile test ride. On this ride I noticed if I didn't close the throttle all the way between shifts, the POP wasn't present. At all other times it was intermittent. Hard acceleration, sometimes. Short shifting, less frequent, sometimes a POP POP. Decel, jake brake-like with occassional crackles and sometimes a weird sounding POP. None of these are consistent except the one where I don't close the throttle all the way between shifts. It's close to being all the way. If I would put a pencil mark on the throttle handle and switch housing, the measurment from fully closed would probably only be about an 1/8th inch. Now, my question finally, will shaving the white spacer a little more help this? I think taking the tank off is a pain in the butt, so I'm seeking opinions first. |
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Title: Re: White spacer maybe? Post by Guido on 08/12/06 at 16:04:49 Anybody? ??? |
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Title: Re: White spacer maybe? Post by enophile on 08/12/06 at 16:21:43 I just rebuilt my carb and battling the same problem. I shaved my spacer about half way and today I was tweaking the mixture but I, too, have a random backfire still. I think mine is an exhaust leak, though, because my sportster muff isn't sealed 100%. But tweaking the mixture did make significant differences in how often and how loud a backfire I get. So maybe I'll eventually find the right spot for it. |
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Title: Re: White spacer maybe? Post by Savage_Rob on 08/12/06 at 17:57:56 Try enriching the pilot circuit very slightly. |
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Title: Re: White spacer maybe? Post by thumperclone on 08/12/06 at 18:42:36 if you replace your stock carb screws with allen head (s.s. better yet)screws you can lossen the carb at the boots and rotate to do your carb work without removing tank... |
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Title: White spacer maybe? Post by Guido on 08/13/06 at 16:35:52 Savage_Rob wrote:
Do you mean shave the spacer more or turn the mix screw out a bit? I ordered a new header gasket that I will try when it comes in. I've also cranked on the muff clamp to the point it feels like the threads will strip. Maybe I could try a better quality clamp for more force. The one that came with the Jardine seems kind of flimsy. |
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Title: Re: White spacer maybe? Post by JerryAssburger on 08/13/06 at 22:36:17 I can't take credit for this, but using that "Muffler Repair Wrap" around and between the pipes (at the joint) seems to make a great air-tight heat-proof seal. It worked for me. |
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Title: Re: White spacer maybe? Post by Dynobob on 08/13/06 at 23:03:31 Guido wrote:
The slow mixture screw is the pilot circuit. Turn it counterclockwise to richen the mixture a bit. I have a bit of popping but I think my head to header gasket is leaking a bit. I'll change it one day ;D |
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Title: Re: White spacer maybe? Post by Savage_Rob on 08/14/06 at 06:37:28 JerryAssburger wrote:
Maybe I used a different brand or something but I tried that a couple of years ago and it wound up just burning off. |
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Title: Re: White spacer maybe? Post by Savage_Rob on 08/14/06 at 06:39:20 Dynobob wrote:
Exactly. If it's maxed, you might need to upsize the pilot jet. You will probably be able to open it up a bit though. |
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Title: Re: White spacer maybe? Post by Guido on 08/14/06 at 14:36:28 Well it wasn't maxed. I set it by turning in til the idle slowed and out til the idle slowed, and the happy middle ended up being 1 1/2 turns out. Ran great there except for the occasional POP. I took your advice and set it to 2 turns out (exactly where the idle starts to slow) when I got home from work. Then went for an 8 mile ride with a lot of shifting. Seems to be a little better but not as much power. Still POPS between shifts but didn't seem as often. I think I'll leave it there for a few days until the new header gasket comes in. Am I being too much of a perfectionist or can I really get rid of these POPS? |
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Title: Re: White spacer maybe? Post by Savage_Rob on 08/14/06 at 14:58:48 It's still possible it could be an exhaust leak. |
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Title: Re: White spacer maybe? Post by Reelthing on 08/14/06 at 15:18:54 Guido wrote:
Sounds like it maybe out a touch to far and perhaps sucking some air either at the exhaust or the intake tube - on the mixture screw - when you get it close you need do 1/8 turn adjustments or less to fine tune that baby in |
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Title: Re: White spacer maybe? Post by Guido on 08/14/06 at 15:45:13 I've been turning about a quarter at a time. I'll try the 1/8 turn to fine tune. It could be an exhaust leak at the header, that's why I ordered a new gasket just in case. I did notice when on the side stand and twisting the throttle or holding an RPM and releasing, the muffler would shake. Especially when holding a certain RPM!! Harmonics? Should it do that? The bolts are pretty snug with the factory rubber washers still in use. What would happen if I took those off? Could that be shaking the head pipe around?? HMMM. |
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Title: Re: White spacer maybe? Post by Guido on 08/14/06 at 15:47:39 Also, Reelthing, it says your running a 155 and 3/64ths spacer on an 02. How does that do? Any backfires? |
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Title: Re: White spacer maybe? Post by Savage_Rob on 08/14/06 at 15:49:40 I tuned my carb for weeks trying to get rid of that last pop and finally replaced the header gasket; that did it. |
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Title: Re: White spacer maybe? Post by Guido on 08/14/06 at 15:56:54 Well, it's really starting to drive me NUTS :o. I hope when that is replaced it will fix it on mine too. The pipe sounds really good. Exactly what I was looking for. But when IT backfires people take cover!! Well, it's probably not that loud ::) but it seems that way to me and I don't like it. And I'm sure it isn't good for the engine. |
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Title: Re: White spacer maybe? Post by 911radioman on 08/14/06 at 15:58:31 It can be aggravating and trying, to say the least when trying to get these things fine tuned. For example, mine was being a bit sluggish and it was recommended that I add some to the spacer. Initially when I did that, I thought it helped, but it didn't take long at all to realize that I spoke too soon. I wound up taking it down a bit past 1/2 spacer, and it has made a world of difference. |
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Title: Re: White spacer maybe? Post by Guido on 08/14/06 at 16:17:04 I thought about trying that too! A little less spacer. Because when holding the throttle open just a little between shifts, it won't backfire. The shaking of the muff could be transmitting to the head pipe and causing the occasional POP because the gasket is bad.( because of the force needed to remove the factory garbage) It could be the spacer. Could be the mix. :P Think I'll try the gasket first and go from there. I'll order some extra spacers too. Oh, went to pick up the gasket Saturday and the guy at the counter gave me a rubber o-ring! I said "this is for the header pipe?" Oops, now I have to wait til Thursday for the correct ( I hope ) part!! Geeeeeeeeeez!!!! Thanks for all your patience guys and gals. ;D |
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Title: Re: White spacer maybe? Post by Reelthing on 08/14/06 at 16:44:16 Guido wrote:
Naw that '02 will let out a pretty good pop sometimes, and has a little exhaust leak - it's a fair bit faster than the '95 and a lot louder but it only has 1500 miles on it vs. 24k miles on the '95 - one of these days I'll go to work on it - just don't ride it very much and normally quite agressive when I do - I keep pointing to the '95 and telling the thing that's the way you should behave , but the '02 isn't paying any attention - in all fairness I'll bet it took 3 or 4 weeks of carrying a little screw driver and tweeking the bike to finally get the '95 spot on - when you get real close it can be a pain - 1/8 or 1/16 turn on the mixture and little on or off on the idle speed - course not too low on the idle or it'll die on you between up shifts when the bike isn't warm yet causing a rear tire skid if you didn't hear it die - all this after you've pickup a half dozen of the cheap spark plugs and did some plug chops - fun stuff! :) :) :) |
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Title: Re: White spacer maybe? Post by Guido on 08/14/06 at 16:50:29 Dang! the jig is up!! I have one of those little screw drivers too!! They should give one of those from the factory!!LOL |
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Title: Re: White spacer maybe? Post by Savage_Rob on 08/14/06 at 18:34:34 And then you go and do something to throw off the balance. Got it right, put on an Amal carb. Got right again, put on a Hard Krome muffler. Retweak every time. |
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Title: Re: White spacer maybe? Post by Guido on 08/15/06 at 17:15:25 One small step!! No exhaust leaks I can see. Broke a Jardine clamp and a factory clamp. Put on an HD clamp and no leaks!! None at the header either. Did the soapy water trick on both. The Jardine muff bolts had chewed through the factory rubber bushings. That's why it was shaking around. Put some larger flat washers under the lock washers to solve that. Mix screw is 1 3/4 turns out. Sweet spot still seems to be 1 1/2. Just testing on the patio, still getting an intermittent backfire. And got a little POOF on shut down. I'll know more tomorrow going back and forth to work. But at least I got the exhaust leaks fixed!! I hope they don't ever come back!!!! |
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Title: Re: White spacer maybe? Post by Guido on 08/17/06 at 14:34:40 On the way to work this morning the bike did pretty well. Still getting the backfires between shifts though. Also did a weird thing when leaving work. 94 degrees and it died at idle 3 times. Finally had to pull the choke for a few seconds. That's the first time I've had to use the choke since rejetting!! This weekend I'm gonna shave a bit more off the spacer and see if that helps with both issues. |
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Title: Re: White spacer maybe? Post by Guido on 08/19/06 at 08:41:57 Did something just to verify. Put in a 155 main. It made everything worse. Even had a little blue flame going!! Put the 152.5 back in and shaved the spacer to 1/3. Also replaced the carb screws with ss allen heads. It's running much better now. 1 3/4 turns out. Little pops barely noticable. I think turning it a little farther out might get rid of them completely. It's real close! I'm surprised the spacer had be filed that far with a Jardine! So, I guess all is good for now ( til I change something else) ;D Thanks to all who helped!! |
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Title: Re: White spacer maybe? Post by lancer on 08/19/06 at 18:09:11 Don't forget that some crackle & pops are OK. No harm, no foul. It is the "BANG!" that we do not want, that is harmful to the engine. Unless you have a carb like the Edelbrock, or have something like a Dial-a-jet hooked up ... both of which have an automatic jetting feature in the way they function, it is nearly impossible to totally eliminate every little pop and crackle. A backfire is the "BANG!", the other is part of the music of a good running engine. |
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Title: Re: White spacer maybe? Post by Guido on 08/19/06 at 18:58:22 Yeah, pops and crackles I can live with. I guess what I meant by POP, was a bang. Like a 22 shot. It seems to be mostly gone though. Gonna take her for a spin tomorrow to make sure. I was busy this morning and it rained pretty good here this afternoon. There's a rally of sorts across the river, think I'll go look at all the HD's that got wet today ;D. And make a little racket of my own. ::) |
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