What does a typical dyno cost to get done?..what exactly do they do.Is that how they adjust the carbs For jetting?some may know that i just got this 94 cbr its been sitting since 99..i cleaned her up nicely alot of new parts,Air filter,plugs,oil ect..But seems to be its running rich.When i took the carbs off to clean them i noticed a stage 1 jet in there..my question is when they rejet.Do the just adjust the jet or fit it with a new one.How does that work?one more thing just to confirm..when i took my carbs off the jet size was 126..i was told by members on here that was in fact a stage 1 jet kit..can anyone confirm?

 

Im a little unclear of your question. But, when a bike is rejetted, there is a new jet with a larger or smaller jet size installed. There is no adjustment of the jet itself. There is however usually an adjustment of the needle, usually the E-clip will be moved one or two positions. There is also sometimes and air fuel adjustment.


Are you running an aftermarket exhaust? A stage one kit with a stock exhaust and stock airbox will run a bit richer. It shouldnt run too rich though, usually a stage one kit can be ran with stock exhaust without any issues.

Why do you think its running rich?If the engine is running ok and not choking out or hesitating anywhere, I wouldnt worry about it. Unless your getting a lot of black smoke out of your exhaust when you take off.. A little is normal for hard aceleration.

Depending on what you call a typical dyno, I had a single dyno run on my bike just to see what it had....that was 20 bucks. If you are going to dyno tune your bike, being that it is carburated, your looking at a hefty bill. A typical dyno tune for a bike with a PowerComander will run around 200-250 depending on how long it takes to get it dialed in. But, with your bike being carburated, there is a lot more time involved than a fuel injected bike that can have its peramiters adjusted with a few key strokes..

 

i am running an aftermarket D and d exhaust with stock air filter..(It may be an aftermarket one not sure not k and N)but it hasitates at lower rpm's till i really get on it..Also plugs are slightly tinted black,after just putting the new plugsin.what else besides the jetting would cause a low rpm stutter?mainly when pulling out.

 

your stage one kit is more than likely due to the aftermarket exhaust. I would guess the hesitation is due to E-clip on the needle not in the correct positon. It could also be the pilot jet not adjusted correctly.The pilot jet will account for idle up to around 1/4 throttle, then the main jet takes over. Also, since you didnt install the jet kit, you might want to get ahold of installation instructions. the person that did it may not have done everything correctly as raising or lowering the E-clip may help with the hesistation as well depending on where its currently at. Im guessing the previous owner didnt want to take the extra steps to tune the carbs properly. I would look up Dynojets website. I think they offer an installation pdf file you can download for free..


Justbe sure its hesitation and not lack of low end power. 600cc bikes are very lacking on low end power, they dont really put any power down until the upper rpms. Usually around 8 grand you will notice a big improvement in power. But if its your throttle response itself, then you may need some adjustment. The real problem is going to be figuring out where your lean and where your rich. You can have a low end lean condition with a high end rich condition or viceversa..

 

heres a link to dynojets website and the pdf file, I just looked it up for ya. the file confirms your 126 is a stage one kit for an aftermarket exhaust.

http://www.dynojet.com/pdf/1140.pdf

 

Wow thanks alot..Im glad im involved in this forum with a crowd of such generious people..That does in fact confirm the jets..But can i still run rich with a stage 1 jet kit.and i got an aftermarket d and d exhaust..Do you Recommend if that is the case i upgrade to a k and N air filter?to possiable lean me out a alittle bit?.I still beleive im running rich not much..But enough to know i am

 

opps maybe i should make myself alil more clean..I dont got an aftermarket exhaust system.I only got a slip on..big difference huh?how can this be corrected.If im running rich with the jet i do have?

 

Your slip-on will still warrant a stage one kit. Its not neccessary, but its recommended. the slip on is still less restrictive than stock.

A stage one kit is not that much richer than stock as long as the other items have been done to carb as well, and not just the jets. If just the jets were installed, then it will runpretty rich.

Your more than likely running rich in the mid range. thats the most common with jet kits. your probably a bit lean down low, rich in the middle and just right in the upper rpms. Most jet kits will get your upper throttle positons correct and then its up to you to get the rest of the carb to follow suit. They offer good base starting points, but those will vary from bike to bike. Its very hard to get carbs exactly correct all the way through the throttle range. you can adjust the needle to make the transition a bit better, but for the most part, it will take a lot of trial and error to get it just right.

I would check your needle position first. Maybe make an adjustment there to start. You can always give dynojet a call and talk to them. Im sure they would be able to help a lot more than just speculation on my part as they make the kit..