Just bought a 2008 kawi with a 840 Big bore kit. Have questions! - MudInMyBlood Forums
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post #1 of 4 Old 04-19-2019, 01:18 PM Thread Starter
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Just bought a 2008 kawi with a 840 Big bore kit. Have questions!

So I just picked up an 08 brute force 750i with a Muzzy 840 bigbore kit, Muzzy duals, MSD programmer, (1)- 2" intake snorkel, A/F Gauge, K&N filter, blow by bottle mod, Dalton clutch kit with red secondary spring( what prevs owner told me), 6" catvos lift with coil spacers all around maxing out lift, 32" silver backs.

The guy was 6 hours away from me and he personally delivered it for 6000$ Canadian.
The bike has around 5500km, around 500-1000 km ago all the add ons where installed. so it was barely driven with the lift and BB kit.

I test drove the bike and all i can say is, it feels like a stock 650

My question is why, My 07 650i with wiesco high comp pistons and web 150i cams, 3" snorkel and other supporting mods would eat this 840 BB bike.

What is this BB kit missing? I feel like the suspension is so stiff that it only has 1/2 travel in the rear when my body weight is applied to the rear.
Im also assuming that power transfer to the ground is lacking due to this stiff suspension.

My plans for the suspension are to remove the coils spacers and run 2010 and up coils springs all around to make it softer.
My 650i has a shaved primary clutch cover so i plan on putting that on the 840 as well.

I feel like a 2" snorkel on a 840 BB would suffer it some, i know doing the 3" snorkel mod on my 650I really woke it up.

As for the cams in the 840 kit, the prevs owner has no idea wat is in it since the dealer built the engine for him, IF it has muzzy cams, are thoses as good as AMR cams?

Im thinking of looking into AMR cams But I dont know how to contact them, anyone have a website or phone number? I've searched for a very long time.

IF it has a stock injectors, should i upgrade them?

Another question is, Is the red rear spring too aggressive to hit that top speed? MY 650 i have maroon and almond epi springs..

Ideally i want this 840BB to be around 80-90 RWHP. help me get it there please.! Thanks

Will take all opinions in consideration!

Brute for 650i,

-Tie rod and tie rod end upgraded
- HMF swamp series pipe XL
- 2 inch lift
- 2 inch spacer ( each side)
- snorkel 3inch INTAKE, 2inch CVT snorkels
- Dynojet 155 front ,160 rear ,neddle 4th notch mixure screw 2.5 turns out
- Rad relocation
- Clutch springs
- ITP c series rims (not in picture)
- 28" maxxis mudbugs
- K & N air filter
- Dynatek black box chip.
- Painted red racks
- painted red plastic peices.
- Oh and had to strip the silver paint off the black plastic:P which was funnnnn
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post #2 of 4 Old 04-26-2019, 06:50 AM
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Sounds like you're already on the right track to me...

Could also be the clutching... that red secondary spring REALLY limits the top end speed.


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post #3 of 4 Old 04-26-2019, 10:26 AM
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Anyone can install an 840 kit in their machine, but if it dont have the right cams and cam springs to match, it will be a dog.
Also that 2" intake snorkel has to be robbing air to the engine which if someone programmed the MSD properly, I would imagine there is less fuel as well - loss of power.
vforcejohn could steer you in the right direction if he has time. Interstate Motorsports - WEB: vforcejohn.com

05 750,Stock Engine,Muzzy Pro Exhaust, Uni Air Filter,
14" Vision Bruiser wheels, 26" Kenda Bear Claw HTR,
3" PVC Intake w/restriction - 2" ABS CVT, center snorkels,Carbs Keihin-#40 pilots 2 1/2 turns out A/F ,#158/#158 mains w/30 thous. washers under stock NFKL needles, 2012 front suspension,
Mr. Gasket 42s Fuel Pump Mod
10" Hayden s-type Electric Rad Fan Mod - mod fan mount
Aftermarket ebay radiator
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post #4 of 4 Old 04-26-2019, 10:30 AM
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Here's a quote from NMKawierider from someone elses post on jetting an 840:

lol...2" wasn't enough for a stock 750 and now its an 840?.. You need to go to the 3" or at minimum 2.5". Then what full pipe have you gone with? Can't use the stock and get much out of it.

05 750,Stock Engine,Muzzy Pro Exhaust, Uni Air Filter,
14" Vision Bruiser wheels, 26" Kenda Bear Claw HTR,
3" PVC Intake w/restriction - 2" ABS CVT, center snorkels,Carbs Keihin-#40 pilots 2 1/2 turns out A/F ,#158/#158 mains w/30 thous. washers under stock NFKL needles, 2012 front suspension,
Mr. Gasket 42s Fuel Pump Mod
10" Hayden s-type Electric Rad Fan Mod - mod fan mount
Aftermarket ebay radiator
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