batavus m48 custom cut COUNTERSUNK head

batavus m48 custom cut COUNTERSUNK head - SPORT TOURING

$59.99

:HERE NOW!!

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custom cut squish 40mm head specifically machined to match the dome profile of the stock batavus laura m48 piston!! this baby is countersunk an impressive 2.8mm to make up for the massive squish that the m48 has stock!

please note this was cut to an original batavus M48 engine we had and I am sure there are multiple variations of pistons/cylinders out there so definitely double check this will work for you. we have not heard of any instances of it not working yet. if we do we will alert you here to any known inconsistencies!

this could be the secret to true bat power if such a thing even exists.

this one is cut to sport touring specs meaning it has a pinch less compression and is more suited for your daily rider builds!

does not use a head gasket, but you can use this stuff if you encounter a leak

some more notes on this from the maker -

These are high compression so you can raise the exhaust port ! For those that are unaware the higher the exhaust port controlling edge the less time for compression, = less compression.

These heads with stock exhaust port height will have a lot of compression, torque and heat in high RPMs. If you're into low rpm and a lot of pull then upjet and retard the ignition timing .

Stock batavus barrel tuning !
For the hacker and dudes with extra cylinders, a safe number to widen your exhaust port is 67% the cord width . Make sure to radius all newly cut edges !! Maybe the old edges too !

The blow down / exhaust duration
It's super cool to throw a degree wheel on and set the exhaust timing or you can document your small steps. When you increase the exhaust size and duration you will also increase the engines ability to Rev higher! Higher Rpms means more mph , at some point the main transfers will not support an exhaust port that is open too long . There is a limit but no one knows what it is !

Piston ring position and boost port
There's enough room between the ring pegs for a cylinder finger port . ( channel cut into the cylinder wall) with a matching window in the piston you now have a 3 port super stock M48!!

It's going to be interesting to see who makes the “ fastest Batavus “ !
***note that there is some very small pitting from the initial casting of the heads. it will not affect the performance do not fret***

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Overall Benefit to Batavus M48	June 19, 2022
taco eater : Das Booty from Newport, RI United States

Drive-ability is noticeably enhanced with this head. Buy the ESO quality studs M6 x 106MM for this install. The original studs are too long. Clean the head with carb cleaner or acetone and equally clean the piston head / de-carbonize while you're in the motor. Do not use any lubricants on the threads when re-assembling. Torque to 8 foot pounds and your golden. This head does not increase MPH, but it does create a totally new motor dynamic, mid range is greatly enhanced; 10-22 MPH is improved, 22-30 MPH is vastly improved, with better throttle response overall. Low end is still classic Low Energy Jeb! Bush, but if you have pedals you're fine.

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