is a RKT head a good bang for the buck on a M7

Einar74 · Dec 17, 2011

I have been thinking about if I should be spending more money on my 05 M7. I like the sled and will maybe just keep it after I upgrade to something newer.

Anyway this is a 05 M7 141 that has a speedwerx single pipe and intake,skinz super-q can. I have RKT secondary fix and I love it. the sled runs well as it is.
no fuel controller( run 0-4000 ft)

But when you have the mod bug you always want something more. the motor is going strong and even if I would like the RKT 800 big bore kit. I can´t justify spend more then 1/2 of what is the total worth of the sled is.

also I would need to add a fuel controller that I don´t need if a only add the head.

The head is $400 and I have been asking Kelsey(RKT) about this and he says it would be a good upgrade,but I want to hear it also from someone that is not benefiting from selling it.

Also if the motor would go, and I would go for the 800 kit, I would need to buy new head or new domes, because the 700cc head doesn´t work with the 800 kit

So the questions is should I stop spending money on the 700cc and just do the full 800cc kit if I would damage the engine.

Sorry if this is a topic that has been asked many times before, I just never have any luck with the search engine on this forum

thanks
Einar

Devilmanak · Dec 17, 2011

I don't know about needing a controller for it, but a RKT head has been impressive on every sled I have had one on. I did have one on an 05 F7, but never rode it. Just on the stand, it was a noticeable difference in throttle response and how it ran though.

Headrush · Dec 17, 2011

PM Likkerpig on this forum and he'll let you know.

He's been running it for a few years.

diggerdown · Dec 17, 2011

Do it, best upgrade for them. I don't know what kind of HP you gain, but the throttle responce is sooo much better.

winter brew · Dec 17, 2011

Had one on my 06 m7....probably the single best upgrade I did, helped with the infamous bog and much snappier at any rpm.

mikew5945 · Dec 17, 2011

I had one on my M7. If you like your sled--BB it. With the head you will have to get a fuel box. If I remember, with your parts you will need to add fuel around 7800 RPM with a head. If you run your parts with the BB you will also need a fuel box. If you go with a head take your time and get a used one. Watch the classifieds on these forums. Used is 1/2 the price and you can still ride until you get one.

Einar74 · Dec 18, 2011

Kelsey said that I didn,t need a fuel box
If I would get a used one, what compression would I need (0-4000ft)

Sledbrain2 · Dec 18, 2011

13 to 1 I believe. I have run a 15 to 1 in the mountains. Never ran it without . I also ran on one an 800 mc besides the m7. Usually you have to take fuel away, so no need for a programmer. Throttle response is very good on both sleds.

diggerdown · Dec 18, 2011

You don't need a controller for the head, fueling was never an issue. It is actually a more efficient combustion chamber so if anything you would pull fuel away. Lots of miles on RKT heads from 800 ft. to 11,000, no issues and no controller.

garciava · Dec 18, 2011

I ran one for four years on an M7. Great up grade and no controller needed. It also took away the low end bog on mine

likkerpig · Dec 18, 2011

I've been runnin the rkt bb for the past few years without a controller. At 0-4k it'll be plenty of fun!!

mikew5945 · Dec 18, 2011

Einar74 said:
Kelsey said that I didn,t need a fuel box
If I would get a used one, what compression would I need (0-4000ft)

This is from Kelsey's web site. If you use your parts you will need a fuel box....

RK Tek Head, Speedwerx Single pipe, Stock Can

3000: 0 0 0 0

5000: 0 0 0 0

6700: 0 0 0 0

7800: 0 0 3 1

8100: 0 0 3 1

cjfarm11 · Dec 19, 2011

I currently run a 14:1 ratio RKT head on my M-7 at 8,000 to 10,000 feet and i love. Pulls well and its nice that you dont need a fuel controller!

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is a RKT head a good bang for the buck on a M7

Einar74

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Headrush

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diggerdown

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winter brew

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