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Post by david3336 on Aug 11, 2013 11:48:58 GMT -5
I have done many 47 and 50 mm bbk is there anything i would have to do differant with the 52mm bbk like extra base gaskets or anything. any help from someone who has done the 52mm bbk would be great. i know it said compression should not be over 220 after break in. can you use stock head or the 50mm big bore head with this kit. i was thinking 52mm bbk with the bb head. again any help would be great. thanks
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Post by millsc on Aug 11, 2013 12:02:56 GMT -5
I've used scrappys 52mm kit a few times can be used with stock head and two base gaskets I ran it with the 50mm head two gaskets 190 psi it has 210 psi stock head two gaskets
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Post by david3336 on Aug 11, 2013 12:43:16 GMT -5
so 2 base gaskets behind the jug and either head and should be good
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Post by millsc on Aug 11, 2013 12:44:47 GMT -5
correct i suggest the 50mm head if you have the funds less wear on the crank
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Post by david3336 on Aug 11, 2013 12:45:20 GMT -5
does it do better than the 50mm as far as more power i mean was it a good difference
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Post by david3336 on Aug 11, 2013 12:46:23 GMT -5
yea i was gonna use 50mm head on it. thanks for all the info
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Post by millsc on Aug 11, 2013 12:46:58 GMT -5
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Post by david3336 on Aug 11, 2013 12:54:44 GMT -5
so you think its worth going from 50mm to 52mm will i see more power. the bike now has a 50mm bbk with stock head its a big body 50cc so it slow to start with it already has everything else that can be done racin clutch. 20mm car  main jet big variator free flow air filter racing cdi hot coil ect |
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Post by millsc on Aug 11, 2013 12:59:30 GMT -5
if its an ebay kit you have now, would be a good upgrade to go to a scrappy taiwan kit, its not a huge difference in power probably be about the same speed. a 50mm kit with stock head will run about the same as 52mm kit with 50mm head and two base gaskets. The 52mm is a higher quality kit and will last longer, in my opinion the airsal 50mm kit and stock head one gasket yields the best power. Can't get them for 50 bucks anymore at spi parts, but its the way to go
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Post by david3336 on Aug 11, 2013 13:04:13 GMT -5
ok thanks i let the guy know what you said and let him make the call i just aint done any 52mm so realy didnt know if it be worth it he hit bout 50mph now on flat ground he weigh bout 200 lbs
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Post by millsc on Aug 11, 2013 13:05:38 GMT -5
better choice is to get a big valve head and if you have a hipro exhaust, uni and a9 cam already, run it with a 24mm carb and manifold no spacer.
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Post by david3336 on Aug 11, 2013 13:08:11 GMT -5
yea he got all that now so you think big valve head and 24mm carb . is 24mm carb a 150 carb
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Post by millsc on Aug 11, 2013 13:10:42 GMT -5
Yes get a big valve head from scrappys the 24mm carb is a 150cc stock carb
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Post by david3336 on Aug 11, 2013 13:14:54 GMT -5
so the head carb set up they show at top of performance 50 page. with 50mm kit he has now ?
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Post by millsc on Aug 11, 2013 13:16:02 GMT -5
yes noticeable gains to be had with that combo
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main jet big variator free flow air filter racing cdi hot coil ect