50cc to 85cc big bore kit installation

justinkr58 · 11-18-2008, 11:22 PM

I have good mech. skills and know motors, if I buy the 50cc to 85 cc bolt on kit do I need any special tools or knowhow or will it all bolt on easily?

katoranger · 11-19-2008, 08:51 AM

I don't think you will need anything more than basic tools. Maybe a torque wrench.

Allen

PremierScooters · 02-22-2009, 08:36 PM

Find a gy-6 service manual. You can find them online for free to download. I found the Tank service manual 50-150cc gy-6. It should walk you through it pretty well and give you all the torque specifications.

forchetto · 04-27-2009, 03:29 PM

There's a very good illustrated document here, detailing the fitting procedure for big bore kits:

Look on the list on the left of the page, under "scootdawg GY6 Top End Rebuild and Big Bore Kit Guide. 16MB PDF"

http://www.scootdawg.com/page3[/b]

bdavison · 05-27-2009, 01:52 PM

Its rediculasly easy.
Some tips
Put it in first gear, and use a wrench to line up the tick marks. Double check all the tick marks before you close everything back up. This is so your valves are timed right.
Scrape EVERY last bit of the head gasket off. and clean it up real good before you put the new gasket on. You dont want a leak after you spent all that time putting a new engine together.
The very first thing you should do after removing the old cylinder is put a rag around the pushrod where it enters the case. That way you dont drop anything into the case. And this should be the last thing you remove before you slide the new cylinder into place.
Be careful with the clip on the piston. Those things are notorious for flying across the room...and they are hard to find.
Double check your piston rings, and make absolutly sure they are lined up right before you push it into the new cylinder.

phil · 05-27-2009, 08:35 PM

its not hard just make sure to adjust the valves, also be aware the kits that i have put a good strain on the battery i dont know if it was compression gains or the changing the timing on the valves as the kit includes a hotter cam

11-18-2008, 11:22 PM	#1
justinkr58 Join Date: Apr 2007 Location: mn Posts: 183	50cc to 85cc big bore kit installation I have good mech. skills and know motors, if I buy the 50cc to 85 cc bolt on kit do I need any special tools or knowhow or will it all bolt on easily?
	0

11-19-2008, 08:51 AM	#2
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I don't think you will need anything more than basic tools. Maybe a torque wrench. Allen __________________ You meet the nicest people on a Honda Clone.
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02-22-2009, 08:36 PM	#3
PremierScooters Join Date: Feb 2009 Posts: 25	Find a gy-6 service manual. You can find them online for free to download. I found the Tank service manual 50-150cc gy-6. It should walk you through it pretty well and give you all the torque specifications. __________________ Premier Scooters,103 N. Hwy 25 Byp, Greenville, SC 29617 Phone 864-294-0042 Specialzing in Chinese Motorsports, Sales, Service and Parts
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04-27-2009, 03:29 PM	#4
forchetto Join Date: Jul 2008 Location: Gijon, Asturias,Northern Spain Posts: 396	There's a very good illustrated document here, detailing the fitting procedure for big bore kits: Look on the list on the left of the page, under "scootdawg GY6 Top End Rebuild and Big Bore Kit Guide. 16MB PDF" http://www.scootdawg.com/page3[/b] __________________ Jincheng Monkey JC50Q-7 (two of them) Skyteam Dax replica ST110-6 (two of them) Zongshen ZS125-43 Qingqi QM200GY-BA Super Motard Yamaha Virago XV1100 Triumph Bonneville SE Qingqi QM110GY PGO Bug rider 250 Buggy
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05-27-2009, 08:35 PM	#6
phil Join Date: Jun 2008 Location: wise va Posts: 636	its not hard just make sure to adjust the valves, also be aware the kits that i have put a good strain on the battery i dont know if it was compression gains or the changing the timing on the valves as the kit includes a hotter cam __________________ halls auto l coolster, modcycles, yanmar & zongshen, dealer fired roketa,lifan and jet moto and apollo quit me who's next
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05-27-2009, 01:52 PM	#5
bdavison Join Date: May 2009 Posts: 26	Its rediculasly easy. Some tips Put it in first gear, and use a wrench to line up the tick marks. Double check all the tick marks before you close everything back up. This is so your valves are timed right. Scrape EVERY last bit of the head gasket off. and clean it up real good before you put the new gasket on. You dont want a leak after you spent all that time putting a new engine together. The very first thing you should do after removing the old cylinder is put a rag around the pushrod where it enters the case. That way you dont drop anything into the case. And this should be the last thing you remove before you slide the new cylinder into place. Be careful with the clip on the piston. Those things are notorious for flying across the room...and they are hard to find. Double check your piston rings, and make absolutly sure they are lined up right before you push it into the new cylinder.
	0