Crank runout

Brapster · Oct 21, 2020

800 etec with 7000kms had it checked over and found .014 crank runout. Still have 140 compression. Should I run it for another season?

catmando · Oct 21, 2020

Brapster said:
800 etec with 7000kms had it checked over and found .014 crank runout. Still have 140 compression. Should I run it for another season?

I happen too have a 800 etec engine for sale with approx 1200 k and 132 psi per side if things don’t work out

Bnorth · Oct 21, 2020

That's a lot. Personally it would be in the back of my mind every time I was over a ridge or down a drainage where the only way out is back up.

RGM · Oct 21, 2020

She is ready to blow, don't ask me how.

1200 · Oct 21, 2020

Be lot cheaper to fix it now before the big ski-boom . That said one of my etec is just under 10k and never been opened up. Never had a 2 stroke go that long before . Im going to run it till it blows

ABMax24 · Oct 21, 2020

0.014"?

I believe the Etec spec is 0.0024" max. You're 5.5 times higher than the max spec.

Spend the money and fix it now, it's going to cost you either way this season, but doing it now saves; other parts, a ruined trip, and probably a helicopter ride.

tex78 · Oct 21, 2020

ABMax24 said:
0.014"?

I believe the Etec spec is 0.0024" max. You're 5.5 times higher than the max spec.

Spend the money and fix it now, it's going to cost you either way this season, but doing it now saves; other parts, a ruined trip, and probably a helicopter ride.

Actually, brp upped it a few years ago to 5.5 thou and not 2.4 thou

ABMax24 · Oct 21, 2020

tex78 said:
Actually, brp upped it a few years ago to 5.5 thou and not 2.4 thou

Brutal, BRP must have done that to save money by denying warranty for cranks with excessive runout. Can't warranty it if it meets the new spec.

Regardless, 14 thou is way out of spec.

NoBrakes! · Oct 21, 2020

Fackin Runner'

Cableguy · Oct 21, 2020

I removed a etec 800 with 18 thous runout
was running like a champ still
sitting on the bench while i decide what to do with it

oler1234 · Oct 21, 2020

Brapster said:
800 etec with 7000kms had it checked over and found .014 crank runout. Still have 140 compression. Should I run it for another season?

depends where you ride... if your tow out is down hill mostly and trails id run it. if your dropping off the backend, id pass on that idea.

06 Dragon · Oct 21, 2020

You could end up with this.
Costs way more to repair!

Brapster · Oct 21, 2020

06 Dragon said:
View attachment 229208 View attachment 229205You could end up with this.
Costs way more to repair!

Yeah definitely don't want that!

Cableguy · Oct 21, 2020

been there and done that thats why my 9000km motor is intact on the bench

1200 · Oct 21, 2020

Run it till it ski-booms. U got to try for 10 000 kms

NoBrakes! · Oct 22, 2020

I love the carnage!!!

Turts · Oct 22, 2020

Had one at .012”.
Would wear a clutch out in a matter of days.
Didn’t seem to vibrate any more than I thought normal.

Brapster · Oct 22, 2020

Gunna change it out, I blew 2 belts last year and thats the only 2 I blew. I thought it was clutch worn out. Definitely makes sense why there's clutch noise.

NoBrakes! · Oct 22, 2020

harmonics kill

MK4TDI · Oct 23, 2020

Brapster said:
Gunna change it out, I blew 2 belts last year and thats the only 2 I blew. I thought it was clutch worn out. Definitely makes sense why there's clutch noise.

definitely change it out, went through it myself last couple seasons ago, engine ran fine and pulled hard but put a dial indicator on for a preseason check and found .022-23 runout... clutch wobbled like an 850

https://youtu.be/b7L99EsW-RE

Crank runout

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