Planet Minis

stunami · 09-16-2008, 01:18 PM

got a k2 50cc if i go with a 85 cc cylinder on the rebuild do i also need to get a new head or will reworking the old head be sufficient maybe a mini monster cam ,new seals valves ,and rockers ? how about a carb and exhaust? stock piston 39mm -so if you go to 47mm or 52mm does the larger piston give the engine more power or is it the same because the stroke hasnt changed ? do i need a larger carb and what would that be , what size jets ? what is a good make carb ? need some help guys. thanks

3cyltrbo · 09-16-2008, 01:33 PM

interesting question - don't have any input other than to say I'm watching this thread for the answer

I've wondered the same thing for putting a CT70 Jug on a Z50 block and head.

sanigene · 09-16-2008, 03:26 PM

Depending on the 85cc kit you get it can use the standard 50cc head. I would recommend [and maybe it's necessary] that you get a bigger carb, the standard carbs are tiny. I ported the intake side of my head and took quite a bit of steel off. Used a dremmel for the rough cutting and then polished with paper and scotch brite.

You'll get an increase in torque with the larger cylinder and I guess [but don't know] that the power increases as well.

dratv.com has a bunch of goodies, check it out.

sani

ps - hopefully the real experts can fill in the blanks

stunami · 09-17-2008, 01:24 PM

went to dratv thats where i came up with the ideas now i just need more info so i can try to get the build correct

09-16-2008, 01:18 PM	#1 (permalink)
stunami PM Newbie Join Date: Jul 2008 Location: LAKES REGION N.H. Posts: 46	rebuildor over build ? got a k2 50cc if i go with a 85 cc cylinder on the rebuild do i also need to get a new head or will reworking the old head be sufficient maybe a mini monster cam ,new seals valves ,and rockers ? how about a carb and exhaust? stock piston 39mm -so if you go to 47mm or 52mm does the larger piston give the engine more power or is it the same because the stroke hasnt changed ? do i need a larger carb and what would that be , what size jets ? what is a good make carb ? need some help guys. thanks Last edited by stunami; 09-17-2008 at 01:21 PM. Reason: added ?'s

09-16-2008, 01:33 PM	#2 (permalink)
3cyltrbo 2nd Gear Member Join Date: Nov 2005 Posts: 275	Re: rebuild --over build interesting question - don't have any input other than to say I'm watching this thread for the answer I've wondered the same thing for putting a CT70 Jug on a Z50 block and head.

09-16-2008, 03:26 PM	#3 (permalink)
sanigene 1st Gear Member Join Date: Oct 2005 Location: NS Posts: 230	Re: rebuild --over build Depending on the 85cc kit you get it can use the standard 50cc head. I would recommend [and maybe it's necessary] that you get a bigger carb, the standard carbs are tiny. I ported the intake side of my head and took quite a bit of steel off. Used a dremmel for the rough cutting and then polished with paper and scotch brite. You'll get an increase in torque with the larger cylinder and I guess [but don't know] that the power increases as well. dratv.com has a bunch of goodies, check it out. sani ps - hopefully the real experts can fill in the blanks

09-17-2008, 01:24 PM	#4 (permalink)
stunami PM Newbie Join Date: Jul 2008 Location: LAKES REGION N.H. Posts: 46	Re: rebuild --over build went to dratv thats where i came up with the ideas now i just need more info so i can try to get the build correct

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