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Plug Chop question

  • Thread starter Thread starter cowb0y
  • Start date Start date
C

cowb0y

Guest
My bike has been sluggish (lean?) around 3-4k in all gears but mostly noticeable 3-5th gear. I first adjusted idle with the high rev method, then did a plug chop. The idle went ok; I noticed #2 was best at all the way down, but did adjust so I dont think the tip is broken off.
The plug chop: I ran the bike in all gears at the trouble spot and then killed it after 5 minutes or so. #1 and #4 where tan and dry. #2 was tan but wet. And #3 was dry but super black and sooty.

So, could you all help decipher this puzzle. I think I get #2, the air mixture screw is all the way down, thus more fuel in the fuel-to-air ratio, right?

As for #3, black and sooty, this is running rich. But how can I run rich on only one cylinder? I will be taking the carbs apart next weekend, but I want to know what you all think I should be looking for.

Thanks yall
 
Which way are you numbering the carbs? :-k

I am guessing that you are starting on the right (throttle hand side) and going to the left (clutch hand side).

If so, that is incorrect. :o

Placing the proper numbers on them (assuming that you numbered them incorrectly), that would make #2 the rich one.
It is very common for #2 to be rich if the petcock is leaking and dumping fuel down the vacuum hose.

.
 
Steve, thanks for the quick reply. However, I am numbering them from left to right. I double checked myself from the owners manual. I also went and checked the vent line just in case and its dry.

Theres fresh fuel and I slapped the carbtune to make sure all were lined up. I got #1 and #4 ~<2mcHg higher than #2 and #3.
I do plan to pull the carbs and check out what might be different between #3 and all others, but I think I will not find anything cause I seem to have to open them up every year. I feel confident that were in good working order before I winterized the bike.

Is it normal to have to open carbs up every year do to issues???
 
Update: I opened the carbs up and found #3 missing its main jet! I found the main jet and washer under the floats. A heads up to others who may have just one fouling plug.
 
cowb0y said:
Is it normal to have to open carbs up every year do to issues???
Click to expand...
Nope.
noway.gif


I cleaned the carbs in my wife's bike about 6 years ago. Probably would not have bothered them this year, but I had them off to replace a missing exhaust bolt, so I figured "why not?".

Besides, I don't think I replaced the intake boot o-rings back then. It's done now. :D

.
 
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