srx cylinders
- Thread starter 02srx
- Start date
the porting is a little hotter on the 2000-02 and the heads are tighter, meaning, the 98-99 have lower compression, and not quite as good of port timing.
sure,just port them to match the new big bore. If you just big bore it and dont do anything with the port timing, the gain is not noticeable.
Junior
New member
ya jeff does some porting with his bigbores.
since you're porting anyways it doesn't matter what year you use, and the 98-99 stuff can be brought up to 00+ spec's easy enough.
since you're porting anyways it doesn't matter what year you use, and the 98-99 stuff can be brought up to 00+ spec's easy enough.
low 160's trail ,race is 168 I think???, call him (cpr)he'll tell ya.
Junior
New member
that sounds about right to me, that's both on jeff's dyno tho, which is pretty conservative.
yamaholic22
Active member
so you think it really might be stronger than that? Like jeff reads them low?
cacsrx1
New member
My CPR trail 780 is an a$$ ripper.
mountain_mod_viper
New member
cacsrx1,
How is the reliability of the 780? I assume this is the kit that uses the 72.9mm wisecos. Did Jeff drill the dimples in the pistons (oil retention dimples)? I'm planning on doing a kit that uses these same pistons.
How is the reliability of the 780? I assume this is the kit that uses the 72.9mm wisecos. Did Jeff drill the dimples in the pistons (oil retention dimples)? I'm planning on doing a kit that uses these same pistons.
cacsrx1
New member
No problems whatsoever, other than I had to add a ton of weight to the clutch (ha,ha)
cacsrx1
New member
I think he says stock jetting, ( Im a little fatter, I can lean it out with the Variflo). Im using HCs with alot of weight in the tip and heel, middle empty, 51-43 in the back with a green spring.Turns 8400 and creeps to 8500.
Mac
Member
cacsrx1 said:
cacsrx1 are you sure you have Simons big bore. Some things don't add up. Simons kit runs 9300 rpm not 8400. Jetting is not stock either. And 15 miles to the gallon gas mileage is better than stock. Please share your jetting specs. --mac--
Mac the srx big bore's run 8400trpm's your thinking of the viper
Mac
Member
Sorry but I couldnt contain myself
Your right I am thinking Viper. Sorry guys. I am having trouble with 15 miles to the gallon though. I have run over 4000 big bore miles with my Viper. Mostly Quebec touring 250 miles a day. I run a tour buddy 2 1/2 extra gallons and my mileage is nasty. No better than eight mpg. The smile on my face does last for quite a while!!
Your right I am thinking Viper. Sorry guys. I am having trouble with 15 miles to the gallon though. I have run over 4000 big bore miles with my Viper. Mostly Quebec touring 250 miles a day. I run a tour buddy 2 1/2 extra gallons and my mileage is nasty. No better than eight mpg. The smile on my face does last for quite a while!!
yamaholic22
Active member
wow that is a little rough on the mileage. Gotta be because of the crazy viper timing, lot of extra fuel compensation
cacsrx1
New member
Yes I have a Simons (trail)bigbore, it is supposed to run 8500, and it gets very good gasmilage. 