Subscribe Today

loss of rpm

The general snowmobiling discussion. Discuss snowmobile tech, ask about trail conditions, talk about snowmobiling issues, whatever. Just keep it clean!

loss of rpm

Postby GRODYH » February 15th, 2002, 2:24 pm

MY 99 POLARIS XC500 WILL ONLY TOP OUT AT 70MPH
WE REBUILT THE CLUTCHES TO FACTORY SPECS.INSTALLED
NEW JETS TO SPEC. HAD CARBS CLEANED, NEW BELT, AND
NEW PLUGS. IS IT POSSIBLE IT IS GETTING A BAD SIGNAL FROM THE TEMP SENSOR? ALSO, I CAN'T FIND
THE FUEL FILTER AND WOULD LIKE TO ELIMINATE THAT
POTENTIAL TROUBLE SPOT. THE COMPRESSION IS A BIT
LOW AT 115 COLD IN BOTH CYLS. IS THIS TOO LOW?
GRODYH@HOTMAIL.COM
GRODYH
 
Posts: 1
Joined: February 15th, 2002, 2:10 pm

loss of rpm

Postby snoracr » February 15th, 2002, 3:16 pm

What is your engine rpm at top speed? Is your track too tight? How do the spark plugs look? Need more info to give you some help. If there is no filter by the air box and steering post then the only filter is a sreen on the end of your fuel pick-up in the gas tank.

*This Message was edited on 15-Feb-02 08:19 PM by snoracr*
snoracr
 
Joined: February 13th, 2002, 3:33 pm
Location: East Troy, WI, USA

loss of rpm

Postby GRODYH » February 15th, 2002, 10:28 pm

we put new plugs in, also checked track tightness
I also thought maybe there was just a screen in
the tank, but I didn't recall polaris doing that.
I think the sled is supposed to go about 8000rpm
GRODYH@HOTMAIL.COM
GRODYH
 
Posts: 1
Joined: February 15th, 2002, 2:10 pm


loss of rpm

Postby Smoothride » February 15th, 2002, 11:33 pm

Does it run 8000 rpms? Does it have exhaust valves? Does it Idle OK?
Smoothride
 
Posts: 4
Joined: December 13th, 2001, 6:38 am
Location: Center of the Universe

loss of rpm

Postby CMYZGO » February 16th, 2002, 3:34 pm

Compression as stated is normal for a cold engine.

Bravo for checking the basics.

I thought that the coolant sensor problems were effective at lower RPM's but you may have something in that circuit affecting it definitely. Try shutting it down, then quick restarting it, and trying it over, before the computer gets to time out the problem and go to limp.

Fuel pump volume/pressure test,

Check condition/color of both plugs-should be identical...

Blue Spark,

Sub out new plugs.


Let us know...


Max

*This Message was edited on 16-Feb-02 09:16 PM by CMYZGO*
Max
CMYZGO
 
Posts: 7
Joined: February 7th, 2002, 1:32 pm
Location: Minneapolis, MN, USA


Return to SnowmobileNews Forum

Who is online

Users browsing this forum: No registered users and 1 guest

cron