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Ski doo Summit X 840 HO big bore

S
Jan 1, 2008
615
5
18
Chanhassen, MN
Sled Head Racing (Big John) 840 HO big bore
- porting
- 14.7:1 RKT head
- newer style pistons (NOT Weiscos)
- freshly built top end 11/2008

Its not an RKT big bore, but the pistons are the same manufacturer that RKT uses. But being a different bore, they are to Big Johns specs. Cylinders were recoated by Big John or whoever he uses. Big John did all of the work on the engine.

Was in a 2005 Summit X. Had it out west over Christmas and ran great!

asking $3500 NOW $3000 Lowered to $2500
 
Last edited:

milehighassassin

Moderator: Premium Member
Staff member
Premium Member
Nov 16, 2005
7,464
2,060
113
FOCO/VAIL
Did you run a updated ECU in this?

Are the pistons RK Tech?

I assume you lost the top end last year? Who did the rebuild, did you get the cylinders re-coated? Who did the work?

Thanks
 
S
Jan 1, 2008
615
5
18
Chanhassen, MN
The ECU is not updated.

Its not an RKT big bore, but the pistons are the same manufacturer that RKT uses. But being a different bore, they are to Big Johns specs.

Cylinders were recoated by Big John or whoever he uses. Big John did all of the work on the engine.
 
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