First off, sorry this is so long but I don't know how else to explain it all.
I am at the end of the rope and don't know which way to turn. Since installing a Hardchrome 2 into 1 Xcellerator I have had nothing but trouble and problems getting the jetting correct, all done at the local Yamaha shop, except once in Fargo. Including the cost of the exhaust, I have spent a ton of money for dyno runs, rejetting, jetting kits and most recently another dyno run and rejetting at a different shop for a little over $163. Here is what I have, 2000 Silverado, ported manifold, BAK, AIS removed, Xcellerator with HP baffles in the down tubes, 167.5 main, 40 pilot, clip on 3.5 and no cue where they set the PMS. I also installed new Autolight plugs and rapped the coiuls with fusion tape. Prior to this I was at 180 main and a 50 pilot, don't know where the clip was or what the PMS was set to before this last session. I knew I was way to rich because the plugs would foul out and they were very carboned up and black smoke was very evident when I cranked it. One other thing, last year either the local shop or the guy in Fargo pinched one of the wires reinstalling the tank which caused one of the coils to fry (installed two new ones). Now, when cruising at 30 mph in 3rd the exhaust changes tone like one or more of the plugs aren't firing and I have to twist the trottle a couple of times to get it to run. Also running at 70 - 75 in 5th its kinda doggy, in fact a new sportster walked away from me like I was slowing down, not trying to excellerate. This morning, I started it up, enricher half way out, pushed it in after starting and the bike wouldn't stay running unless I feathered the throttle. I took off after a minute or two and the bike would not stay running for more than a block. It almost acted like it was running out of gas as it missed real bad, backfired and coughed threw the exhaust and carborator then quit. It was a bear to restart and when I did it would last for another block and do the same thing. The engine felt very hot, more so than ever before so I left it off and trailered it home. Anybody ever hear of anything like this? Any thoughts on what I should try? I am not going back to the shop, I'll buy a different bike before I do that again (but not from them)! But before I do that, I'll put my stock stage three pipes back on and rejet back to stock. Does anybody know what the clip is suppose to be at for stock and I believe the stock main is 165 and the pilot is 35. Any help or suggestions would be deeply appreciated.<br><br>Post edited by: Loobie, at: 2005/05/30 21:19

i feel you brother..
i am indeed thinking aobut the switch back to stock..
thank god i have kept all the hardware...
i am going to try one more thing and if no joy its stock i go...
at least ill know where in going wrong then..
noone seems to be able to shed any light on these problems...
i only reply because i have hard krome 3&quot; long straights and my problem started after their install...
it was not as pronouced till i went to the maxflow a/c but hasnt changed as far as not being able to get rid of it....
good luck and if you go back before i do.. please tell me what you find out
warthog

Thanks warthog, I also have all my stock parts.....somewhere. I still need to find out all the stock settings before going that route and I haven't found anything regarding what they are. The manual refers to them but doesn't give any numbers. I'll keep you posted on anything I find.

Post the miles you have on your bike Loobie, it will helps us all in trying to help you.

Have you tried changing your plugs, nad if you did, did it help at all?

Have you tried any carbon buildup reducing tactics?

I have had similiar problems when my plugs were either old, fouled, or carboned up, and when I had some carbon build up on my valves.

GRAM

Gram,
Thanks, I think this is the info you and others requested, at least I hope so. I just turned 20,000 and before taking it out I install new Autolite plugs wire gapped to .034, I also wrapped the coils with fusion tape. I had the bike out once before (after the dyno and re-jetting) and the symtoms were very simular but not as serious and I was able to keep the bike running by twisting the trottle even though it coughed and backfired a lot, then after riding/warming up for 10-15 minutes it ran without the backfiring and only an occasional cough. Since the dyno, I have filled up twice from 2 different gas stations (regular 87 octane) and did put a couple capfuls of seafoam in the second fill. I was going to drain the gas tonight and refill from a gas can I have from another station and see what that does.

Gram and DocShadow,
I drained the tank, started the bike and let it run out so everything was gone then refilled with fresh gas. After starting with the enricher out half way it acted the same, started good, sounded good, ran good but only for several seconds. It didn't make any difference if I left the choke partially out, had it at 1/4 inch out or pushed it off, the strong idle (1000-1500 rpms) would start falling off and I would have to continually twist the throttle to keep it going and finally it would cough through the carb and quit. It would not start back up right away, I had to wait a couple of minutes then it would do the same thing over and over. Is it possible that after the coil burnt out last year it screwed something else up? I was not able to replace the coils with new stock ones, Yamaha had them all on back order so I bought used ones from a guy on the internet. I will be doing the things Doc recommended hopefully soon but wonder if I don't have some kind of electrical problem in addition to screwed up jetting.

To me it sounds more of a gas problem rather than electrical. It seems to be 'starving' for gas.



My initial thought would be to disassemble the carb and clean it out. Especially the needle in the bowl. You may have some dirt somewhere that's preventing the incoming gas from 'keeping up' with the needs of the engine.

Let's see what the carb guru (Gram) suggests.

Doc

I'm with you DocShadow, I would pull the carb and give her a good cleaning, every nook &amp; cranny, all the orifices from the jets. Make sure that your fuel pump is functioning and that you have a good steady flow at the hose end where it connects to the carb. Check your PMS, turn it in all the way and back it out to 3 turns so you'll have a starting reference to judge how she's running then adjust accordingly. Try a 170 main, you said you had a 167.5, I'm at 6000ft elev. and my bike runs great with the 170, my PMS is at 2 3/4 turns out and the needle clip in the 5th groove. Also make sure that the float is functioning/moving smoothly and check the accelerator pump, no damage to it or clogged.

Doc,
Pulled the carb, took out all the jets, cleaned them along with everything else and took out the 167.5 and installed a 170 main. Reassembled and turned the PMS out to 3 1/8 turns. Started the bike and darn, it stayed running! It even ran good. I went for a short ride after a few minutes and it coughed thru the carb probably 12 times in the first six blocks, missed a little and I had the feather the throttle a bit. After the 4th or 5th stop it died but started right up with now problems. Continued riding and it still missed a bit and only coughed a few times, but jesus lord when I cracked the throttle it took off. As I neared my house I cranked it again and it now pulls very strong, the guy that was helping said he could hear me coming but didn't now for sure it was me because the bike sounded different and very good. I owe all you guys a bottle of Jack for the help so stop on up. :o)
I think I am darn close to getting this FINALLY dialed in and have a little tweeking to do. A little more info.......the elevation here is somewhere between 633 ft to 748 ft I guess depending on which site I look at (east central Wisconsin). I have the PMS at approx. 3 1/8 turns out and the bike coughs alot when cold (more than ever) with the enricher pushed in. I didn't adjust the accelerator pump as that seems to squirt fine. So given all that I assume I need to tweek the PMS, which way do you recomend and how much? Or is there anything else I need to do?

Thanks Big Al,
I never thought I could accomplish this, but with the help of a friend and you guys it was a piece of cake. We didn't adjust the needle, in fact we didn't even look at it but I was told by the mechanic he set it to 3.5, whatever that means (I'm still a major rookie on wrenching). Accelerator pump worked fine which my friend can attest to after getting a face full of gas. As we were cleaning the jets, we took out the starter jet and I have a question, how come the hole doesn't go all the way thru? Seems odd, all the rest do. As close as this thing is to getting dialed in, I think I won't switch back to stock pipes just yet, in fact I think I'll just wait now till I get ticketed and be forced to.