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Discussion Starter · #1 ·
So I pretty much have no clue about pistons, cams, throttle bodies, and porting. I found a 12.5:1 piston for the xx and I wanted to know of any pros or cons vs a 12:1 or an 11:1. Also what cam should I run here? Hot cam stage 2?

Like I said before, I know very little about all of this. any help will be great. thanks.
 

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I have the 12:1 CP piston but I run race gas with my build. I know a lot of the guys went with 11:1 so they could be ok on pump gas and they are making great power. I see Eric from EHS ran a HC3 on his project XX and it made good power. Here's a link to a HC3 for sale on our forum.
http://www.club700xx.com/vb/showthread.php?t=5945
 

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Discussion Starter · #4 ·
depends on the fuel u want to run... for PUMP GAS 91 id recommend a 11:1 CP piston....
race gas/mix then go 12.5 or higher
well in oregon our pump gas goes up to 93 octane. thats what I run in it now. not sure thats enough to go with a 12:1 though. If I go with a 12 or 12.5 and I run the 93, will that hurt anything? a little knocking maybe? I really dont want to pay 6 bucks a gallon for 100 octane.
 

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Discussion Starter · #5 ·
I have the 12:1 CP piston but I run race gas with my build. I know a lot of the guys went with 11:1 so they could be ok on pump gas and they are making great power. I see Eric from EHS ran a HC3 on his project XX and it made good power. Here's a link to a HC3 for sale on our forum.
http://www.club700xx.com/vb/showthread.php?t=5945
what would be the main difference between a stage 2 and a stage 3?
 

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Stage 2 hotcams are normally more for the everyday rider looking for a little more umph. The stage three is more mainly for racers who are in the top of the RPMs 90% of the time. Both are reliable, but for the Stage 3, you normally go with the bigger hitting piston (higher compression). It all depends what you want. I'd go with the 11.1 and stage two, so you can run 93 octane.
 

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with the cam and the xx it will really be about what your budget and hp expectations are. The hot cams are good because they are cheap with the xx you need more parts than other bikes with a overhead cam or rocker style with roller because you need to hardface your rockers this is an extra $150. With better cam you need better springs that will handle the added lift these are around $175 and once better ones than that are made they will be more as well the kibbles that everybody is using now will allow up to .440 lift (they say).

So to run a good (bigger) cam you need $300-$350 worth of supporting parts.

The cam is usally an extra $100 give or take so know you are at $450 extra

The good/bad when you get headwork done and progress your build you will never be able to reach its potential with a smaller cam designed for a stock head the power will be severly limited. The lift necessary for the larger flow numbers/hp will only be able to be supported by these bigger cams the smaller ones will work but it will be like buying a new liver from an acholoic sure it works but not very well.

So hot cams great for stock head next upgrade after big 3, more power, drop in, cheap, easy to install, etc. Bad for bigger builds though, bigger meaning almost anything with port work (bad meaning not that they dont make more power they will just not make nearly what bigger cams will make)

so figure out your budget and where you want to go and choose accordingly

the one point difference in comp wont make a big difference on power with a smaller cam i would go with 11.1 its just much easier for what gains you see and you dont have to worry about issues when you cant find good gas.

throttle body should be matched to cam/head
 

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The Web 492 cam will set you back 210.00 and 150.00 Rockers. The 492 cam is the biggest bang for your buck.
You can have the power of the bigger builds running the stock head or a ported head. Also i support "made in the USA" Products. My.02$
 

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Discussion Starter · #9 ·
wow. Thanks a lot. that was a huge help. I might just run a 2 cam and an 11:1 piston until I can afford all the other parts and upgrade later.
 

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It all depends what you are looking to do. I overheated my XX and damaged my rings so when I took it apart I put in a stage 2 hotcam and 11:1 piston. It runs good for what I have seen so far. Bit I didn't plan on going for any bigger of a build. I didn't even really plan on this build but I figured since it was already apart might as well add some power
 

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wow. Thanks a lot. that was a huge help. I might just run a 2 cam and an 11:1 piston until I can afford all the other parts and upgrade later.
I don't know where you ride but IMO for the same price I would go with a HC3 and make more power. If you ride dunes I think it would be a better cam because it has more top end than the HC2 does and I know when I'm in the dunes I’m flying and not to worried about the low end power. Just my 2 cents
 

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Discussion Starter · #12 ·
eventually I wanted to port my head +1 valves. +3 throttle body. turbo? but all that is way in the future, so I figure I will start with the 11:1 and 2 cam then sell them for whatever I can get and upgrade later.
 

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Discussion Starter · #13 ·
It all depends what you are looking to do. I overheated my XX and damaged my rings so when I took it apart I put in a stage 2 hotcam and 11:1 piston. It runs good for what I have seen so far. Bit I didn't plan on going for any bigger of a build. I didn't even really plan on this build but I figured since it was already apart might as well add some power
Did you notice much of a power gain when you went to 11:1 and hc2?
 

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Discussion Starter · #14 ·
I don't know where you ride but IMO for the same price I would go with a HC3 and make more power. If you ride dunes I think it would be a better cam because it has more top end than the HC2 does and I know when I'm in the dunes I’m flying and not to worried about the low end power. Just my 2 cents
since I probably wont start this until the end of next month I will have to see how my finances are and go from there. just a lot of extra parts to buy for the hc3, not to mention all the core charges.
 

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since I probably wont start this until the end of next month I will have to see how my finances are and go from there. just a lot of extra parts to buy for the hc3, not to mention all the core charges.
Maybe one of the guys much smarter than me will jump in on this one but I thought all the Hot Cams were drop in with stock springs and rockers.
 

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Discussion Starter · #17 ·
Maybe one of the guys much smarter than me will jump in on this one but I thought all the Hot Cams were drop in with stock springs and rockers.
oh. I was looking at the webb cam site.
 

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eventually I wanted to port my head +1 valves. +3 throttle body. turbo? but all that is way in the future, so I figure I will start with the 11:1 and 2 cam then sell them for whatever I can get and upgrade later.
If you want to run the above mods, i would recommend the one of the Web cams. The hc's are for a stock head and would be a waste of money with your head +1 valves and the +3 throttle body IMO.
 
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