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Discussion Starter #1
My J2 does the same, especially on start up and depending on air temperature, humidity etc. My Scottish (not UK) bike obviously runs either degrees 'c' or 'f', as mine starts to read at 40, runs about 70 and fan cuts in at 102, I guess that the white smoke goes at about 55 - 60 and mine is Dealer serviced and runs shit hot!

Maybe nothing to worry about! Does it back fire on the over-run and what are your plugs like [?] as they are the best indication of mixture without messing with the carbs.

Hugh.
 

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bike never backfires, chugs slightly at low RMPS (but I think that's normal -- damn carbs, gimme an '03!!). I changed my plugs a couple weeks ago -- slightly brown, not wet, no real carbon build up. I changed them anyway (haven't changed them since I bought the bike). Maybe I'm just paranoid........


'01 Yellow ZX-6R
 

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He may ride a harley, but I'd say he's pretty close to the mark. Get it on the Dyno for the real answer.

Ash


 

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After starting up, the bike spews white smoke (and smells a bit like gas) from exhaust. Even after the temp is up to appx. 150, it'll still spit smoke. A buddy (although he rides a harley, so obviously knows knothing of bikes!) said it may be running rich. How do I fix? Adjust the fuel mix screws on the carbs? How di I know which ones AND how much to adjust? TIA!


'01 Yellow ZX-6R
 

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i was told the 6R's tend to run slightly rich from the factory...

mine seems to go the same thing. I guess this is good becasue when I get an aftermarket pipe, it might help balance things out....


i'm going to have to check my plugs and make sure everythign is ok...bike seems to run great once it's up to operating temp...


My Drinking Team Has a Racing Problem!
 

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How to do a plug chop


1) find a long hill
2) ride your bike up it in second or third gear at a steady 3000 rpm
3) hit the kill switch at the top
4) roll to a standstill and strip the bike on the roadside to get the plugs out.
5) examine the plug colour and make a record/comparison of it
6) reassemble the bike, warm it back up and repeat the run @ 4000 rpm
7) strip examine and reassemble
8) repeat this procedure all the way up to the 14000 rpm redline


This is the only accurate way you can do a plug check on the road without specialist equipment as the engine needs to be under a constant throttle and load to get an accurate readings from the plug colour.

Once you have done this, make your carburation changes and repeat the procedure.

Alternatively, Take it a shop which has a rolling road where they can simulate these conditions and give you a printout of the gas analysis at a given rev range. Each run should cost $30-40 USD

Ash


 

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If I recall correctly, they do run slightly rich on idle and that part is controlled by the airscrew which is 2 1/2 turns out, Mid range is controlled by the needle taper and needle height and full throttle is on the main jet. Change any of these and you alter the characteristics of the running of the engine in a given throttle position and RPM. They build a flat spot into the rev range to meet emmision testing regs at the measured point the bikes have to meet and this is what the Dynojet and other kits claim to cure.

Ash


 

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What are the air temps you are enountering this white smoke out of your tailpipe? If the air's cold, this is probably normal.

But it the air temp is up in the 50's and above, and you are cleary able to see vapor cloud, you probably have a blown headgasket, or other coolant leak.

Take a white piece of paper and hold it in the exhaust stream, and see if you get coolant and/or specs of oil on it with the engine running at various throttle positions.

BC.


I didn't do it, I swear.
And even if I did, what makes you think I would admit it to you?
 

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Originally posted by minytrker

Check your carbs to see if they are in sync and adjust the mixture screws, your carbs most likly not in sync or adjusted evenly from the factory, on none of the bikes I have worked were right from the factory.

2002 954RR
2001 ZX6R (stunt bike)

http://home.sc.rr.com/minytrker/bike.htm
I just saw the vid of the 100mph wheelie, It looked impressive, but doing it in Jeans is downright scary [:0]. Skin graft City here I come[B)]

Ash


 

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What are you talking about? Jeans are good for atleast one bounce on the road............lol. Your telling me you ride in full leathers everywhere you go. When I was learning to do combo's I would use my 1 piece but just riding wheelies I dont bother, I mean I know I can still wreck but you can also wreck riding down the hwy.

2002 954RR
2001 ZX6R (stunt bike)

http://home.sc.rr.com/minytrker/bike.htm
 

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Originally posted by minytrker

What are you talking about? Jeans are good for atleast one bounce on the road............lol. Your telling me you ride in full leathers everywhere you go. When I was learning to do combo's I would use my 1 piece but just riding wheelies I dont bother, I mean I know I can still wreck but you can also wreck riding down the hwy.

2002 954RR
2001 ZX6R (stunt bike)

http://home.sc.rr.com/minytrker/bike.htm

Always and without exception, I've seen to many mates (and myself) fall of and aquire gravel rash without them

Ash


 
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