650 heads on a 750? - Kawasaki ATV Forum
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post #1 of 21 Old 04-30-2012, 09:14 AM Thread Starter
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650 heads on a 750?

I read the compression increase on the 2012 750 was most attributed to the use of 650 heads. Does anyone know if this a straight bolt-on? I am just curious since I have 4+ years remaining on my warranty and am not ready to start modifying things to that degree. But, if it is a straight bolt-on, it may be worth keeping an eye out for a set of used 650 heads to have ported/polished, etc for the future...

2010 Nocturne Blue Brute Force 750i
- K&N Air Filter + K&N Sock
- Highlifter springs (front and rear)
- Full "Chuck" HDPE skid plate system
- Warn XT30 winch
- Raceline Mamba 12x7 wheels
w/ ITP Bajacross Tires (26 x 9/11 x 12)


Coming Soon:

- Derale Oil Cooler w/ Fan
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post #2 of 21 Old 04-30-2012, 09:24 AM
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Yes 650I heads not 650 prairie heads,the prairie heads would fit and bolt on but intake design is different,the 650I Brute heads have same intake and carb setup,and these will do the compression help.

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post #3 of 21 Old 04-30-2012, 09:29 AM
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Yep. same heads that cams on the 650i since 2005. they are the new 2012 750 heads as well as the TERYX4 heads. these will also be on the 2 seat teryx heads.

the cam shafts are also much larger duration. this is where the mid-top gains are felt and why they like to rev to7200- 7400 vs the 05-11 models prefer 6800-7000


there will be new custom pistons ready for the new 750/650 heads in a few weeks. were shooting for 67-70 rwhp stock bore

John



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post #4 of 21 Old 04-30-2012, 11:06 AM Thread Starter
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Thanks for the information guys...I will keep an eye out from time to time.

2010 Nocturne Blue Brute Force 750i
- K&N Air Filter + K&N Sock
- Highlifter springs (front and rear)
- Full "Chuck" HDPE skid plate system
- Warn XT30 winch
- Raceline Mamba 12x7 wheels
w/ ITP Bajacross Tires (26 x 9/11 x 12)


Coming Soon:

- Derale Oil Cooler w/ Fan
- PowerMadd Handguards + Mirrors
- Audio Tube

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post #5 of 21 Old 05-01-2012, 05:41 AM
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Not looking to hijack a thread but, wouldn't just buying an after market camshaft give you the same results? If not, then can we get an explanation in details about the differences?

Thanks

Dave F.

2008 Brute Force 750i Metallic Nocturne Blue
- Starting to modify...
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post #6 of 21 Old 05-01-2012, 09:28 AM Thread Starter
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Quote:
Originally Posted by DaveFroti View Post
Not looking to hijack a thread but, wouldn't just buying an after market camshaft give you the same results? If not, then can we get an explanation in details about the differences?

Thanks

Dave F.
It may (and I would have to dig into the details of the camshafts), but I was (for the future) considering increasing performance in stages with the first to be ported heads and if I am going to port/polish heads, I may as well increase the compression too and the head swap is an easy way to do that. I already run premium fuel so that is not an issue.

Speaking for me, I would not want to install too radical of a cam in the pursuit of more HP, I will assume they are similar to automotive engines and they begin to lope with increased duration and you have to dive into MAP/fuel curve (and possibly injector) changes. I am not quite ready to mess with that aspect of high performance, call me conservative, but I want more power but not at the expense of reliability or increased maintenance or "tinkering".

Make sense?

2010 Nocturne Blue Brute Force 750i
- K&N Air Filter + K&N Sock
- Highlifter springs (front and rear)
- Full "Chuck" HDPE skid plate system
- Warn XT30 winch
- Raceline Mamba 12x7 wheels
w/ ITP Bajacross Tires (26 x 9/11 x 12)


Coming Soon:

- Derale Oil Cooler w/ Fan
- PowerMadd Handguards + Mirrors
- Audio Tube

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post #7 of 21 Old 05-01-2012, 09:36 AM
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Buying an aftermarket cam be the same as 650I heads?? Yes and NO

go buy and install a "hotcam" you'll gain 2 rwhp. you can only install very small cams with stock pistons.

go install a builder cam (with correct valve pocket pistons) and you are talking 15+ rwhp gains. but to install these you need pistons and valve springs which account for the gains as more of a "package deal"

I see 650i heads making about 2-4 more HP than the 750 head. simply because there is a smaller cc combustion chamber.

this is why 650i machines often run just as well as the 750i machines. you are comparing a 633cc machine to a 749cc mahcine but power outputs are very similar.


now the 2012 brute uses the heads and larger cams. so the 2012 750 vs a 650i, the 750 will crush it.

John



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post #8 of 21 Old 05-01-2012, 09:39 AM
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Quote:
Originally Posted by 2010_KVF View Post

Speaking for me, I would not want to install too radical of a cam in the pursuit of more HP, ?
In these motors, the Cams are the heart. you aren't getting ANY power gains without good cams. they are the most important part of the motor!!!


do an 840 and put in Hotcams. you get 53-55 rwhp but very torquey

do an 840 with a set of stage 3 cams (radical cams) and you got 68-74 rwhp. and a hell of alot torquier.

see the difference cams make??



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post #9 of 21 Old 05-01-2012, 11:01 AM Thread Starter
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Quote:
Originally Posted by VFORCEJOHN View Post
Quote:
Originally Posted by 2010_KVF View Post

Speaking for me, I would not want to install too radical of a cam in the pursuit of more HP, ?
In these motors, the Cams are the heart. you aren't getting ANY power gains without good cams. they are the most important part of the motor!!!


do an 840 and put in Hotcams. you get 53-55 rwhp but very torquey

do an 840 with a set of stage 3 cams (radical cams) and you got 68-74 rwhp. and a hell of alot torquier.

see the difference cams make??
My point was that I did not want to install too radical of a cam, but I would install one with more performance. I have raced cars for years (BB and S and understand the camshaft is the "brain" of the engine and determines (more or less) how it will run, but I also do not want to sacrifice reliability or increase maintenance in the quest for more power (within reason).

Make sense?

2010 Nocturne Blue Brute Force 750i
- K&N Air Filter + K&N Sock
- Highlifter springs (front and rear)
- Full "Chuck" HDPE skid plate system
- Warn XT30 winch
- Raceline Mamba 12x7 wheels
w/ ITP Bajacross Tires (26 x 9/11 x 12)


Coming Soon:

- Derale Oil Cooler w/ Fan
- PowerMadd Handguards + Mirrors
- Audio Tube

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post #10 of 21 Old 05-01-2012, 12:00 PM
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Will you not have to retune the ignition and fuel system to compensate for the different compression ratio?
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