Hi Guys,

First I must say I have been reading on here and gained some valuable advice when dealing with my kids quads and it is greatly appreciated. I have an lt80 and an Eton 90. My problem is that the eton 90 just has a hard time climbing sand dunes while the lt 80 does not. I can see the eton slowly start to lose power going up the hill, ala the "little train that could" and we have to tow it up. The bike is all stock and with the excep of a Unifilter. The bike just seems to bog or run as if it was running rich but when I check the plug it is fine (rust color) and not wet or black. Being an 05, it has the dial setting CDI. Any help would be greatly appreciate by both me and my son. I don't know if the fact that my son is nearly 100 lbs has a great deal to to with it because when he uses the LT 80 he is able to climb the hills.

1. Cleaned Carb
2. Added Unifilter in stock air box
3. Changed plug
4. remove spark arrestor
5. tested compression and it is holder at 105 PSI WOT
6. checked Ignition Coil with volmeter and it was below specs, so I replaced it.

As far as it looks, the clutch housing has never been removed.

 

I believe this is based on the same machine as the polaris 90
Have you checked you drive belt condition? It should be a min of.625" wide if it is the same as the polaris. If its to worn you lose your low and high ratio.
Also look at the clutches to see if you are getting full shift from low to high ratio. A felt marker on the shives wil verify how far the belt travels
My stock sportsman is anything but gutless, my 7 year old an take off spinning and it ill far outclimb my buddys AC 90, but that's a 4 stroke too.

Also verify the throttle is fully opening the carb.
Finally could the exhaust be plugged up with oil? a 2 stroke running too cold or oiling to heavy (mine does this) will slowly carbon the pipe shut.

Just some thoughts
Ken