Engine Mods 98 msrx

saskattakman

saskattakman

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Dec 17, 2005
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Sask Canada
i am looking at pulling my engine apart before winter its got approx 13,000 kms on the original mill so i figure its time....should i do any porting on my cylinders while i have them off??? i love puttin premo in the sled and pulling the rope no problems at all are any mods gonna change the reliabliluty what about the head gasket-head planing mods??? boost bottle??? reeds or what kind of reeds ??i this sled currently has gutted airbox and cold air kit, clutched, jetted, geared down 4 sizes, 1.5x136 track......pulls like crazy to 100 mph also what pistons should i use?? oem's or spi or wiseco?? they are so many different ones to choose from and the yammys here are like 700 bucks for pistons bushings and rings....
 
Last edited:
chevyracer68 said:
i am looking at pulling my engine apart before winter its got approx 13,000 kms on the original mill so i figure its time....should i do any porting on my cylinders while i have them off??? i love puttin premo in the sled and pulling the rope no problems at all are any mods gonna change the reliabliluty what about the head gasket-head planing mods??? boost bottle??? reeds or what kind of reeds ??i this sled currently has gutted airbox and cold air kit, clutched, jetted, geared down 4 sizes, 1.5x136 track......pulls like crazy to 100 mph also what pistons should i use?? oem's or spi or wiseco?? they are so many different ones to choose from and the yammys here are like 700 bucks for pistons bushings and rings....
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Cant do much more with the head gasket since there o-ring, you can have your heads milled. If A/M go V-Force 2 or Yamaha ONLY for reeds. And for top end parts go here:
www.powerpartsplus.com Top End Rebuild shouldnt run ya more than $400-$500.
 
ya i was thinking the base gasket mod where you use take out 1 base gasket and mill the heads down 10 or 20 thou
 
Get a hold of Mrviper and get it ported, you won't believe the difference it will make. Porting alone is worth around 15 hp. Talk to Don before you do anything!
 
should i be doing main bearings the same time as the top end i have approx 13,000 kms on the sled so just deciding what to do will it run another 2-3000 or not??? wanna keep the sled for another year then get rid of it
 
Roll all the crank bearings and see how loose they feel. They should have no side to side play at all, and definately no radial play either. They should roll smoothly and have no visible damage to the races or balls. Crank bearings aren't cheap so if you dont plan on keeping the sled long you will probably not want to replace all of them for insurance. Using a good oil and not leaning down your oil pump goes a long way in bearing life as well.
 
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