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Bratman3401 · Post by **Bratman3401** » Tue Dec 01, 2009 8:44 pm

I am tired of this!!!! the bike keeps running like a dirtbike the same freaken plug fouled out on me. The one all the way to the left it has happened twise i just put this thing in yestersay and barely went a mile!!!! It is covered in black i am just gunna clean it but what causes that? to rich or too lean? and how do i just adjust that one carb to make it better

Bratman3401 · Post by **Bratman3401** » Tue Dec 01, 2009 8:48 pm

huh? i think the carbs are sync'd and i just rejetted them but i dont know how to do the valves so i think thats outta the question for now i really just need a quick fix so i can go to school and back the rest of the week and have all 4 cylinders

yamaha_george · Post by **yamaha_george** » Wed Dec 02, 2009 9:10 am

Bratman3401 wrote:huh? i think the carbs are sync'd and i just rejetted them but i dont know how to do the valves so i think thats outta the question for now i really just need a quick fix so i can go to school and back the rest of the week and have all 4 cylinders

B,
OK you just re-jetted and now you have one cylinder running super rich (very black & sooty) I would take that float bowl off and check that the jet has not fallen off (very common after a re-jet by some one not too experienced) The other possibility is that the check valve in that carb is not seated completely.

As for carb Synching you cannot think they are, you have to know that you rebuilt the carbs and then run the synching tool on all 4 carbs ( there are several threads in the site history on doing this with bought & HOMEMADE tools, since like most going to school are usually short on folding stuff) (been there done that :-{{{

Bratman3401 · Post by **Bratman3401** » Wed Dec 02, 2009 3:32 pm

I didnt pull the carbs apart so i dont know why i would have to sync them i thought that was just when u pull the 4 pieces apart? i just put the jets and other things that came with the kit in.

Post by **sweekster** » Wed Dec 02, 2009 4:32 pm

Bratman3401 wrote:i just put the jets and other things that came with the kit in.

This is the very reason to synch them. You changed the jets (probably going to bigger if you put in a kit) so you have changed how they operate, and thus, changed the "balance" that was there before.

reelrazor · Post by **reelrazor** » Wed Dec 02, 2009 6:06 pm

Im'a throw this out there:

One of the jets in that carb (#1 cylinder) dropped out and is now laying in the float bowl.

The mix is completely unrestricted...hence, VERY RICH.....fouls plug in minutes.

yamaha_george · Post by **yamaha_george** » Wed Dec 02, 2009 6:14 pm

Bratman3401 wrote:I didnt pull the carbs apart so i dont know why i would have to sync them i thought that was just when u pull the 4 pieces apart? i just put the jets and other things that came with the kit in.

B,
Do not beat your self up about it, we have all started at the beginning and learned by our mistakes (well in my case most of the time :-}

I am sure RR will delivery a very good lecture on the optimum air /fuel ratio for "that" temp & atmospheric pressure.

Suffice it to say from me that by balancing the air flow (synching) to each carb we trust we are optimising the balance of air / fuel across the 4 carbs.

How ever this is just an average setting that appears to work best, what most people do not realise is that the number on the jet is just a batch number ie it can flow as much as 5% either side of some pre-set figure.
If you are suffering from insomnia any time soon take a read of:-

http://www.saltmine.org.uk/martin/jet_sizing.html

Hats off to Martin for doing the work !!!!

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