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High Performance Bicycle Engine Tips and Motorized Race Bicycles We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us. Also check out some of our racing members builds

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  #11  
Old 11-05-2016, 02:36 PM
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Tony01 Tony01 is offline
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Default Re: briggs timing...firing before tdc??

Don't touch the eyebrows on that block. On some blocks the deck height is significantly taller than the valve seats and it's a good mod, but on that one if you do even a little bit of grinding you risk getting a loose valve seat.

Here's the high comp head it's shaved somewhere between .025 and .030", this head with 6* timing advanced and a port/polish job of smoothing the exhaust threads and corners and rounding the inside corner of the intake will make the engine quite a bit more powerful. I have a mag also but you'd need to figure a way to put the plug wire in cause I cut it off to use on my new motor. Head could use some wire brushing in the valve pockets and maybe a good sandblasting on the fins (a couple fins missing)
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Last edited by Tony01; 01-05-2017 at 03:37 AM.
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  #12  
Old 11-05-2016, 05:43 PM
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scratchbuilder scratchbuilder is offline
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Default Re: briggs timing...firing before tdc??

10-4..01 no eyebrowing. I'll practice the porting u mentioned on a spare2hp block. I had 2....but..not paying attention my dremel shaft messed up the v seat.�� . I'll keep in mind the coil. Can I sand the head down using plate glass as my surface? Also I read bout guys cutting fins off. Seems to me the a critical balance to mess with. Suggestion?? Hey Curt, msrfan thread is wild! Cable op advanced timing...wow.
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  #13  
Old 11-05-2016, 09:00 PM
curtisfox curtisfox is offline
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Default Re: briggs timing...firing before tdc??

Another adjustable timing............Curt

http://motorbicycling.com/showthread.php?t=60803&page=7
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  #14  
Old 11-08-2016, 04:20 AM
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Tony01 Tony01 is offline
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Default Re: briggs timing...firing before tdc??

Yup glass n sandpaper will work that's how I did mine but it was a ton of sweat! I never cut fins off I just broke them trying to get the plug loose with the wrong tools...
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