I found a complete CPR 800 big bore kit for my SRX 700 and have a couple of questions for the pros.
Here are the details: Its in great condition and only used on the lake with 10 runs. Wiseco pistons, compression is around 16:1 to 17:1 so it will not run on pump gas with these heads and it has trail porting.
Now for the questions:
If I wanted lower compression to be able to run 91 pump gas, is it just a matter of changing to a different set of heads? ...I know they will have to be cut for the 800, or is there more to it?
He has a set of Bender pro stock pipes and a high rpm CDI also, but I am wanting to to keep it looking and sounding close to stock(keep DNR happy!). Pipes and a can at the most. Is the CPR 800 a good choice or should I stick to a little 700 and get it ported?
Here are the details: Its in great condition and only used on the lake with 10 runs. Wiseco pistons, compression is around 16:1 to 17:1 so it will not run on pump gas with these heads and it has trail porting.
Now for the questions:
If I wanted lower compression to be able to run 91 pump gas, is it just a matter of changing to a different set of heads? ...I know they will have to be cut for the 800, or is there more to it?
He has a set of Bender pro stock pipes and a high rpm CDI also, but I am wanting to to keep it looking and sounding close to stock(keep DNR happy!). Pipes and a can at the most. Is the CPR 800 a good choice or should I stick to a little 700 and get it ported?
valin
Active member
The CPR is a well built 780. Yes, you will have to have heads cut to bring your compression down to about 12:1 for pump gas. Run the stock pipes. Those race pipes would be horrible in the trail, and loud.
That setup should net you about 10 additional hp over a trail ported 700.
That setup should net you about 10 additional hp over a trail ported 700.
staggs65
Moderator
I run a cpr 780 and it runs pretty strong with stock pipes. there's still more on the table when I get my hands on a set of bender big bore pipes. there's bigger trail-able horsepower potential with the big bore with the right pipes, carbs, reeds and case porting. (been a few guys here who dynoed in the 180hp range) but it can be costly for that stuff too. trail friendly porting 150-160hp range for $500-$1000. trail big bore 170-185hp range (with the right components) $2000-$3000+.
comes down to what you're willing to spend for the amount of hp gained
comes down to what you're willing to spend for the amount of hp gained
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So is the CPR actually a 780 then?
I can get the set up for the low price of a port job.
I can get the set up for the low price of a port job.
staggs65
Moderator
I'd buy it. as a matter a fact if you don't, hook me up with the info so I can.
I will be sure to let you know. I am thinking about the big bore, but I am not interested in the high rpm cdi or the prostock pipes. Also if I get it, I will not need the high compression heads if anyone is interested in them.
staggs65
Moderator
are you getting the pipes heads and cdi with it or are they extra
The heads come with it, but the pipes and cdi are extra
the heads can simply be remachined to lower the compression. I would actually check the specs first if I were you,(cc the heads and check squish clearance) alot of times what people tell you and something actually measures out to be are a bunch a ways apart.
hooh us up on the pipes and cdi box, if your not interested, just bought Hauck 800 sled.
Fusion, are you the one that bought Jeff's 800 in Ottawa?
Yes I am, couldn't turn it down at that money, It has a couple small issues but he is gonna make it right, very good guy to deal with.
Thats what I was thinking. I was going to buy it, but was a few hours late! I bought the 01 with the Ohlins instead.
Good deal, is it everything he said? my primary is all bent, but he is gonna get me one
I have known Jeff from years ago and this one looks to be good, but I haven't had the time to go over everything yet.
I just picked up the big bore kit tonight for $600!!! Just have to decide which sled to put it on now.
Are you interested in the prostock pipes and high rpm cdi? If so I can PM you the info.
I just picked up the big bore kit tonight for $600!!! Just have to decide which sled to put it on now.
Are you interested in the prostock pipes and high rpm cdi? If so I can PM you the info.
I'm thinkin just the box for now, then probably do the carbs and keep it for trail sled fun
staggs65
Moderator
what's he want for the pipes?
$900 for the pipes and cdi