need help, doesn't run right

[banshee dave]

I went riding this past sat. I put new plugs in before going out. Over the winter I installed 34 mm PJ Keihen carbs, new billit intakes without the crossover tube ports, an aluminum intake with K&N filters. I am running RDZ inframe drag pipes with modified DG silencers to be able to run the airbox. I'm not sure of the mains, I think they are 155 or 165 and the pilots are 47.5 I think. I will pull them and check what is in there. I also shortend up the wiring and relocated the cdi under the gas tank. the problem I am having is when I was out riding the right cylinder was running great, the plug was tan. the left side on the other hand was cutting in and out and when the right was running great the left would sound as if it was idleing, i.e the ping ping ping sound of a two-stroke and the plug was black,wet and sooty looking. I am running the timing at +7 but I am going back down to +4. when I got home and started it up I noticed a ton of smoke coming out the left pipe and not so much out the right and the USFS screen on my left sparky was wet looking. The cylinders are ported and they seem to run great when I had the stock carbs and airbox with uni filter. it was hard to start with the stock carbs and wasn't running to it's potential so I upgrade my parts with crappy results . any help would be great

[locogato11283]

it would really help to know what your jetting is now. theres a huge difference from 155 to 165. i dont have any experience with the 34mm pj carbs but there are guys here that do. help them help you by letting them know whats in the carbs now..

[banshee dave]

my jetting is 162 mains on both carbs and pilots on both are 42. It starts on first kick every time.

[zpolencheck]

I have stock carbs and I am having the same problem: one cylinder is running great the other is lagging behind like it only fires every other time. at idle it is good and at full throttle but anywhere a little above idle and below the "powerband" you can hear the difference. my plugs are new, and seem to be not overly black, pretty close to choclate brown. I can see that is "spits" a little gas mist out of the right carb,the one not running right, backwards into the air box if i have the top off and I am looking in there. compression is great on both sides. Also, I have 250 main jets. It has t4's, open air box, uni filter and that is all for mods. I tried eveyrthing, changed plugs, checked spark and it seemed good, the carbs are 100 percent in sync, i checked the gaskets on both sides of the reeds, and I am all out of ideas. PLEASE help US.

[dajogejr]

my jetting is 162 mains on both carbs and pilots on both are 42. It starts on first kick every time.

 

What are all your mods, including airbox/air filter type system.

As well as your elevation and riding temps??

[dajogejr]

I have stock carbs and I am having the same problem: one cylinder is running great the other is lagging behind like it only fires every other time. at idle it is good and at full throttle but anywhere a little above idle and below the "powerband" you can hear the difference. my plugs are new, and seem to be not overly black, pretty close to choclate brown. I can see that is "spits" a little gas mist out of the right carb,the one not running right, backwards into the air box if i have the top off and I am looking in there. compression is great on both sides. Also, I have 250 main jets. It has t4's, open air box, uni filter and that is all for mods. I tried eveyrthing, changed plugs, checked spark and it seemed good, the carbs are 100 percent in sync, i checked the gaskets on both sides of the reeds, and I am all out of ideas. PLEASE help US.

 

 

You might want to start your own thread for help. It is considered "rude" to hijack another's thread, even though you have a similar problem...you have two different bikes. It will get confusing for both those trying to help...and for the member asking for help....

 

:thumbsup:

[bigboybanshee]

Those PJ carbs are strange to me, you adjust the idle by screwing/unscrewing the choke knob. First thing I would do is check to make sure both carbs' chokes are screwed in equally. Even though that adjustment is supposed to only affect idling, if it's out of adjustment it'll make that carb run rich. Check it out

[zpolencheck]

You might want to start your own thread for help. It is considered "rude" to hijack another's thread, even though you have a similar problem...you have two different bikes. It will get confusing for both those trying to help...and for the member asking for help....

 

:thumbsup:

 

 

VERY sorry, I didn't mean to step on any toes, that is why at the end of my reply i said help US...us... as in the original poster and I. I will start my own.

[dajogejr]

No biggie.

Typing on the net doesn't portray tone very well, wasn't trying to sound like an ass.

Quite a few of us read and reply in several threads on any given day...trying to help as well as learn things.

 

I'd hate for one of you to get the other guy's advice and have a problem from a simple communications mix up...

 

Best of luck!!

[banshee dave]

ok this is what I have done so far. Took the carbs apart and cleaned them really well, I have a parts washer and I blew them off with my compressor, put them back together and reinstalled them. the reeds are also fine. took the timing back down to +4 where I had it for the past few years and stated it back up. I ran worse then before. What I think is wrong, oh and the left cylinder is still running richer than the right so I am going to drop the main this weekend, but what I think the biggest problem is is the exhaust pipes(RDZ inframe drag pipes) are too big for my motor . I think they aren't allowing the motor to run right. I was never able to get on the pipes even at full throttle on long staight fire roads or even able to get into sixth gear without bogging. I think the pipes are gonna go on ebay and I'm going to get some FMF pipes.

[banshee dave]

I ran a compression test on both cylinders and both are 150 psi. I don't know if it should be higher or lower at my elevation but I have a cool head with 19 cc domes with weisco pro light pistons. I still need to drop the mains down because I fouled the plugs which I figure was the missing on the left cylinder and the pipes are way to big for my settup, I will be getting pro circuit pipes shotly and I hope that was or is my whole problem. thanks for everyones thoughts and help.

[KEVSWS6]

I ran a compression test on both cylinders and both are 150 psi. I don't know if it should be higher or lower at my elevation but I have a cool head with 19 cc domes with weisco pro light pistons. I still need to drop the mains down because I fouled the plugs which I figure was the missing on the left cylinder and the pipes are way to big for my settup, I will be getting pro circuit pipes shotly and I hope that was or is my whole problem. thanks for everyones thoughts and help.

 

I dont think your pipes are to blame unless they are big bores on a 450 or smaller CC engine. I would start by jetting down the main. What needle are you running? May be rich on that also. CEJ, CEK, or CEL work well.

[jet mech]

I would swap carbs around cable and all and see if problem fallows this will help you isolate your problem :shrug:

[banshee dave]

ok,I just bought fmf fatty gold series pipes and the q silencers. I installed them and solved my problems. runs great now. I think the pipes I had on it were big bore pipes which I wasn't told that when I bought them. I was under the assumption that they were top end pipes but for small bore. oops. Oh, I also still have to rejet. Thanks for the help guys!