Thread: Rotax Racing Cam
07-30-2007, 03:54 PM #1
Rotax Racing Cam
What exactly does this cam offer over the stock cam...any h.p. increase? Low end grunt, top end pull? Is there any real benefit to stock ECU (8100 rpm) ski running this cam? Are any other mods needed to run it reliably?
07-30-2007, 04:05 PM #2
around 14 hp.... And better acceleration.. Get the racing ECU..
07-30-2007, 09:06 PM #3
can this cam be bolted up to a stage III 2007 RXP?
do u get 14hp over and above what stage III gives?
is anything else required like timing adjustments or is this piece drop in and go with current timing on 2007 RXP engine from factory with ROTAX Racing ECU installed and 42 injectors, inner cooler, 158 thermo etc.?
thanks in advance for any help!
Steve (rides it like he STOLE it) Reid
07-30-2007, 09:26 PM #4
Steve, the cam makes more power from 7000 RPM on up no matter what stage of mods you have. The Rotax Racing cam likes to be advanced slightly. You will know you have it right once your compression is 135 psi. It comes alive in this position. Yes, it will fit the 07 skis.
07-30-2007, 09:40 PM #5
how do you advance the timing?
and how much would you want to advance the timing with a stage three set up?
how much is the cam?
do you have to reshim the cam for proper installation/valve lash clearances maybe?
if so does it come with the specs and can u buy the shims with the cam?
on my racing fourwheelers u install measure then go get the shims need for proper clearance from HONDA but im NOT sure about this?????
07-30-2007, 10:00 PM #6
You advance the cam timing by rotating the sprocket in its slots. You keep playing with it unti your compression is at 135 and you are good to go.
The rockers have hydraulic lifters in them so no need to shim or set valvelash.
The cam is $1290
07-30-2007, 10:16 PM #7
Jerry are u saying:
1) take the tension off the cam chain and WITHOUT removing the gear on the end of the cam shaft rotate the chain/cam ONE tooth at a time UNITL achieving 135 psi PER CYLINDER?
2) if so which way do you start the cam chain rotation so i DONT chase this thing should i decide get one?
3)one tooth to the left as in counter clockwise movement or one tooth to the right as in clockwise movement?
07-30-2007, 10:17 PM #8
last but NOT LEAST is it REALLY WORHT THE PUNCH???????
07-30-2007, 11:35 PM #9
the bolt holes in the cam gear are slotted and the amount adjustment is within these slots. DO NOT advance or retard a tooth on the gear!
07-30-2007, 11:39 PM #10
so the gear and the chain STAY mated in the same tooth u only turn sprocket on the end of the cam shaft for adjustment to 135 psi then is what u r saying?
and move WITHIN the slots in the gear on the end of the shaft to find the 135 psi?
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