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08-17-2010, 08:51 PM
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Has anyone had this problem??
OK, a few weeks ago i had a piston/cam installed and a dyno tune; the air fuel mixture was dead on and it ran great for about the first 8 hours of riding. Well today i noticed when i stabbed at the throttle it would lag a bit before accelerating. After about 30 minutes of riding it started popping and would cut off. I would cycle the key and it would start right up and idle perfect, but as soon as i gave it trottle it would start popping again. Does anyone have an idea of where i can start to remedy this problem. The popping seems like a lean mixture?? 
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08-17-2010, 09:06 PM
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Sounds like your cam jumped timing. Double check that, check condition of chain, and make sure tensioner is working.
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08-17-2010, 09:28 PM
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Quote: Originally Posted by tscracing
Sounds like your cam jumped timing. Double check that, check condition of chain, and make sure tensioner is working.
10-4 i was hoping you wouldn't say that. I'll try to check it or i'll have my mechanic check it. Is it common for the cam to jump timing?
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kfx 450 SOLD
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08-17-2010, 10:29 PM
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I wouldn't say it's common, but it does happen. You wouldn't be the first.
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08-17-2010, 10:42 PM
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Quote: Originally Posted by diggin riggin
Quote: Originally Posted by tscracing
Sounds like your cam jumped timing. Double check that, check condition of chain, and make sure tensioner is working.
10-4 i was hoping you wouldn't say that. I'll try to check it or i'll have my mechanic check it. Is it common for the cam to jump timing?
If you suspect your cam chain is loose enough for your cam to jump time?
Then definitely check your Chain tensioner it has to fail first for your chain to slack to allow your cam to jump "Time" also check your cam chain for stretching....
And what is the altitude from where you adjusted your A/F on the Dyno...
To where you ride?? If there is a 1500 ft difference then adjust your A/F mixture....
(Up) in altitude your A/F becomes "Leaner" mixture
(Down) in Altitude your A/F becomes "Richer" Mixture
14:1 is the Ideal A/F setting measured on a Wide-band O2 sensor / Dyno-tune.
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08-17-2010, 10:51 PM
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Quote: Originally Posted by Dust Devil
Quote: Originally Posted by diggin riggin
Quote: Originally Posted by tscracing
Sounds like your cam jumped timing. Double check that, check condition of chain, and make sure tensioner is working.
10-4 i was hoping you wouldn't say that. I'll try to check it or i'll have my mechanic check it. Is it common for the cam to jump timing?
If you suspect your cam chain is loose enough for your cam to jump time?
Then definitely check your Chain tensioner it has to fail first for your chain to slack to allow your cam to jump "Time" also check your cam chain for stretching....
And what is the altitude from where you adjusted your A/F on the Dyno...
To where you ride?? If there is a 1500 ft difference then adjust your A/F mixture....
(Up) in altitude your A/F becomes "Leaner" mixture
(Down) in Altitude your A/F becomes "Richer" Mixture
14:1 is the Ideal A/F setting measured on a Wide-band O2 sensor / Dyno-tune.
The dyno shop is very close in elevation to my riding area and it has been running strong up until today. I just went to my garage and removed all the plastics and fuel tank to check the hose and electrical connections (all seemed well). I put the tank back on and fired it up and the problem seemed to have went away!! I don't know wtf is going on but there must be something loose that i missed. Can the tps possibly cause this??
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kfx 450 SOLD
kfx 700/FST 730 w/stage 3 cams,11.5 comp, muzzy super pro, 36 mm carbs
kfx 700 stock
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08-18-2010, 05:49 PM
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Quote: Originally Posted by diggin riggin
Quote: Originally Posted by Dust Devil
Quote: Originally Posted by diggin riggin
10-4 i was hoping you wouldn't say that. I'll try to check it or i'll have my mechanic check it. Is it common for the cam to jump timing?
If you suspect your cam chain is loose enough for your cam to jump time?
Then definitely check your Chain tensioner it has to fail first for your chain to slack to allow your cam to jump "Time" also check your cam chain for stretching....
And what is the altitude from where you adjusted your A/F on the Dyno...
To where you ride?? If there is a 1500 ft difference then adjust your A/F mixture....
(Up) in altitude your A/F becomes "Leaner" mixture
(Down) in Altitude your A/F becomes "Richer" Mixture
14:1 is the Ideal A/F setting measured on a Wide-band O2 sensor / Dyno-tune.
The dyno shop is very close in elevation to my riding area and it has been running strong up until today. I just went to my garage and removed all the plastics and fuel tank to check the hose and electrical connections (all seemed well). I put the tank back on and fired it up and the problem seemed to have went away!! I don't know wtf is going on but there must be something loose that i missed. Can the tps possibly cause this??
you might have had a slight "clog" in your fuel pump screen "causing the Lean conditions"...That when you removed the tank it work itself free....."check out this thread" It talks about the fuel pump... Fuel pump fuse: - Kawasaki KFX450 Forum :: KFX450HQ.com
if it happens again? it may have found its way back and re-clogged the pumps filter screen "FLUSH YOUR TANK"....
Think of using a paint strainer when filling your tank to filter-out that which will clog your fuel pumps filter screen.
Last edited by Dust Devil; 08-18-2010 at 06:01 PM.
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08-18-2010, 06:07 PM
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Location: augusta, georgia
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Quote: Originally Posted by Dust Devil
Quote: Originally Posted by diggin riggin
Quote: Originally Posted by Dust Devil
If you suspect your cam chain is loose enough for your cam to jump time?
Then definitely check your Chain tensioner it has to fail first for your chain to slack to allow your cam to jump "Time" also check your cam chain for stretching....
And what is the altitude from where you adjusted your A/F on the Dyno...
To where you ride?? If there is a 1500 ft difference then adjust your A/F mixture....
(Up) in altitude your A/F becomes "Leaner" mixture
(Down) in Altitude your A/F becomes "Richer" Mixture
14:1 is the Ideal A/F setting measured on a Wide-band O2 sensor / Dyno-tune.
The dyno shop is very close in elevation to my riding area and it has been running strong up until today. I just went to my garage and removed all the plastics and fuel tank to check the hose and electrical connections (all seemed well). I put the tank back on and fired it up and the problem seemed to have went away!! I don't know wtf is going on but there must be something loose that i missed. Can the tps possibly cause this??
you might have had a slight "clog" in your fuel pump screen "causing the Lean conditions"...That when you removed the tank it work itself free....."check out this thread" It talks about the fuel pump... Fuel pump fuse: - Kawasaki KFX450 Forum :: KFX450HQ.com
if it happens again? it may have found its way back and re-clogged the pumps filter screen "FLUSH YOUR TANK"....
Think of using a paint strainer when filling your tank to filter-out that which will clog your fuel pumps filter screen.
Thanks for the info that very well could be my issue.
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kfx 450 SOLD
kfx 700/FST 730 w/stage 3 cams,11.5 comp, muzzy super pro, 36 mm carbs
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08-18-2010, 10:26 PM
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It wouldn't hurt to test your TPS??? "Just to make sure"...
Last edited by Dust Devil; 08-21-2010 at 10:57 AM.
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08-19-2010, 02:51 AM
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Yeah, I would check the TPS to be sure.
It could be shifting around on you.
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