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post #1 of 10 (permalink) Old 08-02-2011, 11:22 AM Thread Starter
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Noisy engine after bb kit (why???)

I have done a standard bore kit and a 840 kit and just wanted to know if anyone knows why there is alot more engine noise after the kits are in. With the valves adj proper and everything all good they still make more topend noise. I just find it funny when the stock motor runs quiet and you do the bb and its noisy and all the ones I see 3 840 1 880 1 standard bore all noisy after. Why can someone shed some light.

Thanks Chris
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post #2 of 10 (permalink) Old 08-02-2011, 12:57 PM
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Depends on what cams you have,some base circles are smaller then stock cams.Some of the JE slipper pistons knock like crazy. There are a few other reasons such as piston clearances that are more because of forged pistons vs. stock cast,ect. ect.
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post #3 of 10 (permalink) Old 08-02-2011, 01:05 PM
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Quote:
Originally Posted by chrisco View Post
I have done a standard bore kit and a 840 kit and just wanted to know if anyone knows why there is alot more engine noise after the kits are in. With the valves adj proper and everything all good they still make more topend noise. I just find it funny when the stock motor runs quiet and you do the bb and its noisy and all the ones I see 3 840 1 880 1 standard bore all noisy after. Why can someone shed some light.

Thanks Chris
all i know is mine is noisey also, as you already know too, maybe time will help on it.

2010 teryx, 840 muzzy bb, stage 2 cams,valve springs, dalton clutching, overdrive cover, 2 " lift, platinum 212 ss rims,bighorn radials, home made box delete and rollbar, cold air intake, muzzy syphon break, muzzy valve covers, muzzy impellor, msd controller, muzzy duals, mini monster tach, aem af guage, water temp guage, 4 k warn winch, pc925 battery. etc
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post #4 of 10 (permalink) Old 08-02-2011, 01:08 PM
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Originally Posted by lightening840 View Post
all i know is mine is noisey also, as you already know too, maybe time will help on it.
JE piston,isn't it?
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post #5 of 10 (permalink) Old 08-02-2011, 01:11 PM
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Quote:
Originally Posted by chrisco View Post
I have done a standard bore kit and a 840 kit and just wanted to know if anyone knows why there is alot more engine noise after the kits are in. With the valves adj proper and everything all good they still make more topend noise. I just find it funny when the stock motor runs quiet and you do the bb and its noisy and all the ones I see 3 840 1 880 1 standard bore all noisy after. Why can someone shed some light.

Thanks Chris
all i know is mine is noisey also, as you already know too, maybe time will help on it.

2010 teryx, 840 muzzy bb, stage 2 cams,valve springs, dalton clutching, overdrive cover, 2 " lift, platinum 212 ss rims,bighorn radials, home made box delete and rollbar, cold air intake, muzzy syphon break, muzzy valve covers, muzzy impellor, msd controller, muzzy duals, mini monster tach, aem af guage, water temp guage, 4 k warn winch, pc925 battery. etc
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post #6 of 10 (permalink) Old 08-02-2011, 01:14 PM
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JE piston,isn't it?
yes JE piston, stage 2 cams, valve springs

2010 teryx, 840 muzzy bb, stage 2 cams,valve springs, dalton clutching, overdrive cover, 2 " lift, platinum 212 ss rims,bighorn radials, home made box delete and rollbar, cold air intake, muzzy syphon break, muzzy valve covers, muzzy impellor, msd controller, muzzy duals, mini monster tach, aem af guage, water temp guage, 4 k warn winch, pc925 battery. etc
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post #7 of 10 (permalink) Old 08-11-2011, 08:24 AM
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well whatever was tickin in mine suddenly went away???? now this could be a good thing or a bad thing, lol im hoping its a good thing....

2010 teryx, 840 muzzy bb, stage 2 cams,valve springs, dalton clutching, overdrive cover, 2 " lift, platinum 212 ss rims,bighorn radials, home made box delete and rollbar, cold air intake, muzzy syphon break, muzzy valve covers, muzzy impellor, msd controller, muzzy duals, mini monster tach, aem af guage, water temp guage, 4 k warn winch, pc925 battery. etc
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post #8 of 10 (permalink) Old 08-11-2011, 01:58 PM
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are you sure your cam chain adjusters are working properly??
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post #9 of 10 (permalink) Old 08-11-2011, 02:00 PM
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i work on a lot of brute force 750's and alot of problems with cam chains and adjusters
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post #10 of 10 (permalink) Old 08-11-2011, 11:31 PM
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are you sure your cam chain adjusters are working properly??
I have one of these noisy 840's that Chrisco is talking about, and yes I would assume the cam chain tensioner's are working properly. I have 120 hours on my BBK now and it is still running strong, just makes alot of noise, and burns a wee bit of oil so I am leaning towards bigger cylinder wall clearance.

2012 VIBRANT Blue Teryx 4, Muzzy pro's, ECU reflash, custom cage & roof, windshield, 14" STI HD Beadlocks & 32x10x14 STI Roctane's/Tatou 4S Tracks, Rigid Lights, Custom bumpers, Warn XT4000 winches front & rear, bedlift

2010 black, FST 840 stage II cams, DASA intake & injectors, BF throttle bodies, Msd, Muzzy Pro`s, Snorkeled, Warn XT 4000, EMP, 2 seat race cage, Custom rear Radiator, Unisteer, STI HD beadlocks and 30x10x14 EFX motoclaws
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