04-30-2013, 08:10 AM #1
11 years, 370 hours, 7 trophys, finally worn out
I check compression yesterday on the 97. Top speed has been down the last few times I have ridden it. It usually runs 68-69 all day in any kind of weather, and 70 when the conditions are ideal. Here lately 67-68 is all it will run. The compression on #1 cylinder is 142, #2 130, #3 142. This motor has been untouched since 2002, all I have done is rebuilt the carbs. After I sent the motor to Group K in 2002, I worked out of town and had Group K do all the work including the assembly and pressure testing. Obviously they did an incredible job.
It has been the most consistent and reliable ski I have ever owned. I find it amazing to get 370 hours out of a modified 2-stroke. I am glad it showed signs of something not being quite right instead of a crank or pistons failing and causing severe damage. It will be rebuilt, but I am not in any hurry. My GPRXP will keep me entertained.
04-30-2013, 08:26 AM #2
NO FREAKIN WAY. I guess you could not expect it to last forever.
Well like you said, atleast it did not chunk a rod or piston out the block like I do to my motors.
So after this rebuild, it will be around 2024 before it needs to be rebuilt again?
04-30-2013, 08:36 AM #3
Group K did a great job on that one. Of course we all know that you take care of your stuff.
04-30-2013, 08:42 AM #4
04-30-2013, 08:49 AM #5
05-01-2013, 08:54 PM #6
- Join Date
- Jul 2009
What type of oil are you running? That may have much to do with your engines longevity.
05-02-2013, 09:31 AM #7
05-02-2013, 09:35 PM #8
I pulled the head tonight. Will post pics tomorrow. Everything looked great considering the hours on the motor. I could still see the cross hatches in the cylinder walls, barely. Piston wash was good although the middle piston was the leanest/hottest. The head gasket was definetly in need of changing.
Last edited by 97GPSLEEPER; 05-03-2013 at 06:41 AM.
05-02-2013, 10:14 PM #9
Hurry up and get one of your skis back in the water. I need someone to ride with.
P.S. I will be in Htown this weekend. I will see if I can prod Rich a little on the GPRXP pump swap.
05-02-2013, 10:54 PM #10
It's a Yamaha that why you got all those hrs out of it !!!!!!!
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