Muzzy 840 vs four strock tech 840 BB kits - Kawasaki Teryx Forums: Kawasaki UTV Teryx Forum
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post #1 of 11 (permalink) Old 01-07-2009, 09:52 AM Thread Starter
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Muzzy 840 vs four strock tech 840 BB kits

What are the differences in these packages and if so what are they and why is one better than the other? Also is there a third option and what are its merits?

Muzzy 840cc w/stage 3 cams
Fourstroke tech 840cc w/stage 3 cams

08 teryx 750 on 14"ITP SS112 and 28"Mudlites
Muzzy Exhaust|Generator cover|Uni Air Filter|Dalton Clutch Kit|Programmable Dyna CDI|HW Teryx Carb/Air Box Kit|vent racing billet OD clutch cover|4500lb viper elite winch (broken) |
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post #2 of 11 (permalink) Old 01-07-2009, 10:09 AM
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Dont really know anything about the muzzy kit, does it include heavy duty valve springs??
I have the FST kit and it ROCKS, my uphill speed increased 25mph on my stretch of test highway, this was my stocker with only a VDI and tip removed vs. my FST 840 teryx with muzzy, vdi, and dalton kit!
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post #3 of 11 (permalink) Old 01-07-2009, 02:46 PM
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What are the differences in these packages and if so what are they and why is one better than the other? Also is there a third option and what are its merits?

Muzzy 840cc w/stage 3 cams
Fourstroke tech 840cc w/stage 3 cams
You would have to talk to Muzzy about their cams that will be the main difference. I was told they were just using wenb 150I's,but that was along time ago. My cams are about 70 degree's longer duration the stock @ .040

If their cams don't need valve springs that will tell you it's not big enough IMO.
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post #4 of 11 (permalink) Old 01-07-2009, 02:50 PM Thread Starter
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What is the compressor ratio on your kit?
Also is the 840 kit a bore and piston swap or do you install a whole new cylinder sleeve.
If so how is cooling affected?

08 teryx 750 on 14"ITP SS112 and 28"Mudlites
Muzzy Exhaust|Generator cover|Uni Air Filter|Dalton Clutch Kit|Programmable Dyna CDI|HW Teryx Carb/Air Box Kit|vent racing billet OD clutch cover|4500lb viper elite winch (broken) |
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post #5 of 11 (permalink) Old 01-07-2009, 07:54 PM
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I believe the FST pistons are a TRUE 11:1 CR, the original cylinders are bored and renicklesiled (sp?). Mickey may even have cylinders ready and you just send yours in as cores.
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post #6 of 11 (permalink) Old 01-08-2009, 05:37 AM
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I'm very happu with my FST 840cc kit
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post #7 of 11 (permalink) Old 01-08-2009, 08:04 AM
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What is the compressor ratio on your kit?
Also is the 840 kit a bore and piston swap or do you install a whole new cylinder sleeve.
If so how is cooling affected?


11:1, we sell it with or without the cylinders done. Everything is in stock. We have had no problems with over heating. This kit has been out for the Brute Force for 5 years now.
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post #8 of 11 (permalink) Old 01-08-2009, 08:48 AM Thread Starter
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do you guys do the primary clutch mods by chance? recurve the faces?

08 teryx 750 on 14"ITP SS112 and 28"Mudlites
Muzzy Exhaust|Generator cover|Uni Air Filter|Dalton Clutch Kit|Programmable Dyna CDI|HW Teryx Carb/Air Box Kit|vent racing billet OD clutch cover|4500lb viper elite winch (broken) |
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post #9 of 11 (permalink) Old 01-08-2009, 11:53 AM
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do you guys do the primary clutch mods by chance? recurve the faces?
Yes we can but the bolt on Dalton stuff is real good too. Cutting the clutch is good for more top end mainly, the Dalton kit is adjustable and can be change for different set ups.
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post #10 of 11 (permalink) Old 01-08-2009, 12:29 PM Thread Starter
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have the dalton setup.

08 teryx 750 on 14"ITP SS112 and 28"Mudlites
Muzzy Exhaust|Generator cover|Uni Air Filter|Dalton Clutch Kit|Programmable Dyna CDI|HW Teryx Carb/Air Box Kit|vent racing billet OD clutch cover|4500lb viper elite winch (broken) |
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