whats this roketa motor???

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whats this roketa motor???

Postby oilyhans » Sat Nov 26, 2005 9:41 pm

hi .
does anyone know what motor the roketa breeze 50(cc) 4stroke
uses? i have one to repair and have been waiting for warranty parts
from the lamer internet dealer for months, so much for their warranty
i need a new topend kit piston,rings,wpin&gaskets ..
may go bigger but need to know i'm working with oh yeah there is no manual to refer to.
thanks,
oilyhans
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re: whats this roketa motor???

Postby tortoise » Sat Nov 26, 2005 10:48 pm

If the Roketa is the same as the Venom 4-stroke 50cc Breeze scooter, my guess would be the 139QMB (GY6) . . links:
Venom Breeze - Manual Resource - Parts
Just curious . . could you tell what caused the top end to fail on your engine, if that was the case?
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re: whats this roketa motor???

Postby steamboat » Sun Nov 27, 2005 7:42 am

Could you give us the link to the dealer you where the bike was purchased? Jim.
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re: whats this roketa motor???

Postby oilyhans » Sun Nov 27, 2005 9:35 am

i have a scooter rental & sales biz.
This scoot was brought to me by the kid that bought it from some crooks
BTW don't buy scoots from DFWSCOOTERS they are the worst people to deal with!!!!
a picture of said scoot is at:
http://www.terminatorscooter.com/shtml/ ... /1557.html

thanks guys!
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re: whats this roketa motor???

Postby oilyhans » Sun Nov 27, 2005 9:45 am

on a 2 month old roketa scoot
the compression was low 95lbs.
& the scoot would not hold pressure test ...20lbs max.
brokedown the scoot and found that water was in the cylinder for a long time ( before it was run) & the rings were leaking on one side of the piston..
oilyhans
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re: whats this roketa motor???

Postby tortoise » Sun Nov 27, 2005 11:48 am

139QMB 4-stroke 80cc kit vendor links: ScooterTronics - Valley - Backstreet
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re: whats this roketa motor???

Postby oilyhans » Sun Nov 27, 2005 4:12 pm

the kit on the scootertronics page looks like a 2 stroke..
the wrist pin on this roketa is just under the rings (12.56mm from the top o the piston) and is about 13mm dia.. if that helps
thanks
oilyhans
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Re: re: whats this roketa motor???

Postby tortoise » Sun Nov 27, 2005 6:50 pm

oilyhans wrote:the kit on the scootertronics page looks like a 2 stroke

I agree . . the present image does not correspond to the text . . perhaps a clueless webby.

Tutorial Image Links (for those on dial-up, these may take a while to load): Disassembly - Assembly
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re: whats this roketa motor???

Postby DickW » Mon Aug 09, 2010 3:00 pm

The Roketa 50cc engine is as stated in one of your replies. 139QMB GY6. This engine may have slightly different numbers depending on different displacement. For example Mine has P39QMB. The P stands for 4-stroke. This engine is used in many chinese scooters.
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re: whats this roketa motor???

Postby oilyhans » Mon Aug 09, 2010 3:16 pm

wow this post is a oldie ,,,5 years old!!!!!
good thing i fixed that scooter long ago ...
and btw it was a regular 139QMB , i ended up using some TNG 4T parts
to fix it since the internet dealer(DFWSCOOTERS) was such a PTA to deal with,..

oilyhans
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