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Old 01-27-2010, 12:25 PM   #1 (permalink)
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2004 Arctic Cat 570 lx fan twin

2004 Arctic Cat 570 lx

980 miles. Completely stock. Machine looks brand new 1 owner older person never beat on.

Problem; Won’t go above 40mph or 6k rpm full throttle.

Items checked;
Compression 125 each cylinder
Carbs cleaned and checked completely stock working fine.
Timing checked
Drive (primary and secondary clutch) completely stock engages smoothly
Installed new kit in fuel pump
Doesn’t appear to be a fuel issue.

Machine starts and idles great. Accelerates fine. Just won’t go above 40 mph/6k rpm.

Wondering if there is some kind of rev limiter in the CDI that is malfunctioning. I have the Arctic Cat service manual, but they don’t talk about anything like this in the troubleshooting.

Thanks
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Old 01-27-2010, 04:43 PM   #2 (permalink)
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Take the belt off and draw a straight line on the clutch faces (primary and secondary) with a sharpie. Put the belt back on and run it around. See where the marker is rubbed off and that will give us more info to help with the problem.
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Old 01-27-2010, 06:28 PM   #3 (permalink)
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See if there is belt build up on the sheves! Sand them down and blow them off real good! Then put a new belt on and try it!
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Old 01-28-2010, 12:38 AM   #4 (permalink)
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More info.....

Thanks for the suggestions. I will try them and get back to you. The sheaves still look like new since it has such low miles. And this thing was ridden easy. The clutch kicks in about 4k RPM, but won’t rev above 6k RPM at full throttle under load. Unloaded it revs to 8k RPM easily. But the way it is acting, it seems as if the timing is not advancing. Which is resulting in lack of HP. It reacts like the motor just “bogs” or “plains out” at full throttle. I mentioned that I checked the timing. I did that with a timing light and it seemed to be advancing properly. Which is done electronically, but I am not certain if it is done in the CDI or at the magneto? I am leaning towards an ignition or timing issue only because the other thing I noticed is that the left cylinder plug consistently comes out dry and light, while the right side looks normally wet and tanish. Because of that I initially suspected crank seal (given the age and low miles), but when I pulled the clutch and plate that covers the seal everything looked dry and the ether spray trick didn’t increase engine speed. Thanks again.

Last edited by motomech10; 01-28-2010 at 12:43 AM. Reason: correction
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Old 01-28-2010, 09:47 AM   #5 (permalink)
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Did you check simple stuff first? Like is the throtle actually opening the carb all the way? Is the fuel pump delivering enough?
Timing is done threw the CDI Box! How is the belt deflection? If the belt is too loose it might not be able to pull a full shift and the belt is full out but not fully down in the secondary!
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Old 01-28-2010, 09:54 AM   #6 (permalink)
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Yes.....

....the carb slides are synched and opening all the way. The fuel pump was rebuilt and appears to have normal fuel pressure. Additionally we tried an auxiliary fuel tank to feed the carbs just to eliminate fuel delivery as a problem.

Thanks for your help.
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Old 01-28-2010, 04:42 PM   #7 (permalink)
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I'm still going with a clutching issue.
Try the test I outlined and see where the belt actually rides in the clutches.
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Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


Worshipful Master; F&AM Dryden Lodge# 472
http://www.masonicdryden472.org/

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