800HO rebuild or rings?

[swampy45]

Ive got about 4000km on my 800HO, still runnning strong and pulling equal and strong compression. I know I am probably pushing my luck with it starting to lose compresion, so I want some opinions. Should I just do the rings, or do my top end? Any suggestions on a top end kit to drop in? Thanks in advance.

 

[DRD]

Change the pistons, no question. Many good choices for drop in dual ring pistons available. I liked the MCB or SPI stuff

 

[tex78]

Grease the pto bearing and new seal too

 

[CUSO]

If you like buying new shortblocks, do just the rings.

Mine looked great, still had machine marks on intake side of pistons, but a skirt broke and the whole bottom end was done also.

 

[swampy45]

thanks for the heads up, top end it is. MCB seems to be the way most people are going, any other suggestions?

 

[CUSO]

Get a hold of KORE on here. He sells the kits, and has good pricing.

 

[tex78]

Get a hold of KORE on here. He sells the kits, and has good pricing.

Yes x 2

 

[swampy45]

Thank you kindly! I'll look into it and get a hold of him. Appreciate the info fellas!

 

[pinkpantherusmincus]

i would also talk to kelsey at rk tek. i had his kit in mine and it far outlasted the mcb's in the wifes sled.

 

[sick1]

Whats wrong with stock pistons? 4000 trouble free km no good? I"ve pulled more dead two ringers down the mountain than single ring stockers, With way less km on them.. I never would especially spi.. You will be sorry... lol

 

[DRD]

I've had good luck with SPI in the series three 800 that was eating three bottles a day and in a triple running 8800 rpm, not sure why yours didn't last.
Way to many engines had skirts fail and trash the entire engine with stockers but glad you had good luck with them.

 

[duck]

I went with MCB dual ring on my 2010 renegade. 2000 km's last year. I also replaced the wrist pin bearings in the kit with BRP ones. Lots of posts on Dootalk of failures of the chinese cheaply made wrist pin bearings supplied.

 

[CUSO]

There was a recall on them a couple of years back. I think they are ok now.

I went with MCB dual ring on my 2010 renegade. 2000 km's last year. I also replaced the wrist pin bearings in the kit with BRP ones. Lots of posts on Dootalk of failures of the chinese cheaply made wrist pin bearings supplied.

 

[duck]

There was a recall on them a couple of years back. I think they are ok now.

I would not chance it, Bought mine last year and you could feel the difference in the bearings.

 

[_Adrian_]

Whats wrong with stock pistons? 4000 trouble free km no good? I"ve pulled more dead two ringers down the mountain than single ring stockers, With way less km on them.. I never would especially spi.. You will be sorry... lol

I have a rebuilt 800HO with the SPX pistons and I'm at 3 season / 5300KM and still have 150PSI per hole.
Its all about the warmup and maintenance schedule really.

Also when I rebuilt it EVERYONE on Dootalk told me its going to "squeak" for sure as my piston to wall tolerance was way below spec ( 0.0015 / 0.0017 )
Still ridding it and running cheapish oil ( Shell Gold ) compared to the OEM BRP full synthetic.

 

[swampy45]

alright, so I'm doing the rebuild... Is it mandatory to pull the engine or can it be done as is? Havent rebuilt an engine, so this should be interesting...

 

[pizalm]

You can redo the top end in the sled. But it's only couple more steps to pull the block and do it on the bench.


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[duck]

Did mine in frame

 

[swampy45]

Thanks guys!

 

[DRD]

Take a close look at your carb boots as well, they were brutal those years. I'd pressure test the motor while you are at it.