| Author | Message | ||
     Jmkybf |
I have what I call is a bastardized buell cyclone-1997 frame, 2000 suspension and body work, and a 2002 White lightning motor that I just put in. Before that it had an 86 883 motor. About a month before I took the 883 out, the rear cylinder starting fouling its plug. I assumed that the cold weather and 200 main jet and 48 slow jet had something to do with it. I swapped in the 2002 lightning motor along with a 98 s3 cdi since the previous cdi was an 883, and I started it up and it doesn't want to idle or rev at all. I can hold the throttle open about halfway and it will stay running but misfire like crazy. After about 30 sec, I shut it off and both plugs were carbon fouled. The plugs were clean before I put them in. I had just replaced the intake seals. The carb has 200 main jet and 48 slow jet along with a dynojet thunderslide kit. I'm thinking that there is something internally wrong with the carb. It got progressively worse with the 883 engine. I had it apart several times to play with jetting and install the thunderjet kit, but it never seemed to solve the problem. Any help or info would be appreciated. | ||
| Buellistic |
is the bellows thing on top of the slide installed correctly ??? also check the jet needle ... | ||
| Jmkybf |
Yes, the diaphragm is installed correctly. The slide moves up and down according to the vacuum. Also the jet needle is on the 3rd grove and also goes up and down with the slide. | ||
| Sstlouisjak |
Hello John Welcome to the form from a fellow Missourian. These guys will help you figure this out. | ||
| Firebolt020283 |
are you using the same carburator you had on the 883 or a different one? | ||
| Jmkybf |
Thanks for the welcome. It is the same carb I was using for the 883. I believe that it is a buell carburetor. When I got it it had a 200 main jet and a 48 slow jet, which I think was stock jetting for some cyclones and lightnings. I know it is a Keihin CV type carb. I believe it is 40mm. | ||
| Buell_bert |
I would not think you could take a carb from a 883 to a 1200 or vice versa and have it run properly without some internal and external parts and/or adjustments. | ||
| F_skinner |
I think the first years of the evo 883 may have used a 34mm CV carb. I could be wrong on this. I helped a few people do 883 to 1200 conversions but we always switched the carb to aftermarket. | ||
| Jmkybf |
I believe that you're right in that the early 883 had smaller carbs, but this carb wasn't originally off an 883. I'm thinking it was off the 2000 buell cyclone that was used for the suspension and body parts. I measured it, and it is 40 mm. Correct me if I'm wrong, but I would think that 200 main and 50 slow jet would be more than enough for a 1200. This carbon fouling started when it was on the 883. I just figured it was jetted really rich. I don't know if there is something internal in the carb causing this. As mentioned before, I have been in the carb and everything looked clean. Would a clogged passage cause this? | ||
| F_skinner |
Any time I have had a carb act like that it needed to be rebuilt. Those rubber seals are only good for about 5 to 8 years max. I think you said you cleaned but if you did not replace the rubber it can cause you problems. Also make sure your throttle and idle cable are working properly. I know that sounds simple but it has stumped me before. Al at American Sport Bike has rebuild kits and they are not that expensive. A 200 main jet sounds big to me on a stock motor. I usually run 185 to 190 but I am at a different altitude. Also check the connections to your coil and plug wires. Frank | ||
| Jmkybf |
I was hoping it was something that simple. It was just weird that it kept on getting progressively worse. I'll order a kit tomorrow and hopefully that will take care of the problem. | ||
| F_skinner |
If it is getting progressively worse then that is what it sounds like. Make sure you report back on how it goes. Frank | ||
| Jmkybf |
It'll probably be a week or two until I get the work done, but I'll make sure and report back. Thanks for all your suggestions. | ||
| Mbuccieri |
I am new to this site. I have a 2000 M2 Cyclone and have always had odd experiences with my carb. I am told to get rid of the stock CV and get a Mikuni. The motor is stock but I do have a slip on Vans and Hines exhaust and my air box is gutted. What size Mikuni should I go with? Since my air box is gutted out is it worth also getting the sidewinder open filter(I think that is what it is called) | ||
| Buell_bert |
Jmkybf, I had what sounds like the same thing and it was loose connections to the coil. They looked OK but I just put a little more crimp and it has been smooth riding since. So check that and the coil. Also to Mbuccieri I have a 2000 and 2001 M2, and both of the stock carbs have worked flawlessly. One has 7k mi. and the other 14k mi. | ||
| Kilroy |
If you want to go with the Mikuni you need a HSR 42. No real HP gains but the throttle response is instantaneous, and is very noticeable. | ||
| Mbuccieri |
Thanks. That is the one of the problems, at the very bottom if I really hit the throttle hard I get a little hick up. Also at the top end when the bike reaches it's max it floats away and dies. My brother has a 99 and his won't go any faster but also will not break up. Does that sound like I may be on the right track or not? I did rebuild my CV and changed the slide and tried all different jets with the same results. | ||
| Mbuccieri |
Another question? You guys seem to really know your bikes. If I have gutted my box and changed the exhaust, what would be the next step as far as horsepower gains without turning my bike into a high maintenance race machine? Any suggestons? | ||
| Jmkybf |
I'll have to do that crimp idea since I'll finally have time to work on the bike tomorrow. If that doesn't work, I have a kit waiting to be put in the carb. I'll let you know how it works out. | ||
| Jmkybf |
So I finally got around to checking the resistance in the plug wires, and the short one was 6350 ohms and the rear one was 260 ohms. The 1997 S1 manual posted in knowledge vault says the short one should be 1625-3796 and the long one should be 5000-11680. My question is why is one over spec and one under? I assume this is contributing to the fouled plug problem. | ||
| Jmkybf |
And I just checked my coil and it was within spec- 2.9 for secondary circuit and 10040 for primary circuit. |
