swapping a 150 gy6 in a 50 gy6

iambeetle · Posted: Fri Aug 29, 2008 4:22 am Post subject: swapping a 150 gy6 in a 50 gy6

has any one dropped a 150cc in a 50cc gy6? my racing friends thought it would by fun to play with these at the track. I know the engine mounts are different, 150 on top and 50 in front lower. are the frames different or is there a motor mount that needs to be installed?
What do you guys think?

Fox · Posted: Fri Aug 29, 2008 4:48 am Post subject:

It's been brought up before but I haven't heard of anyone actually doing it.

iambeetle · Posted: Fri Aug 29, 2008 11:32 am Post subject: pixs

My friends want to do mods to their scoots this winter. We have those schwinn graduate 50cc scooters, I know they produced a 150 graduate if some one has one could you take some pixs of how the motor is mounted? I just want to see if the frame is the same and needs a new mount or if they are totally differant. I have seen several differant brands that look the same, scooternitro has a retro scooter in a 150 that looks just like it. thanks for your help...Dan

joe_T · Posted: Fri Aug 29, 2008 11:32 am Post subject:

I think the engine mounts can be changed over, ive never tried it but thought of it.

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J€Di · Posted: Fri Aug 29, 2008 12:05 pm Post subject:

It's a bad idea, for the following reasons:

* Frame may have different engine mounting points and reinforcements.

* Rear shock mounts may need welding on, frame may not have strengthening lugs in place.

* Brakes will be different - could be rear disk instead of drum.

* Electrics may not match.

* Instrument cluster may be different.

* Your licence may not allow you to ride a 150 bike.

* You'll never get it insured, it's almost impossible insuring a modified Chinese bike - it's hard enough getting a standard one covered.

* The US equivalent of the DVLA may demand to inspect the bike, and if it's not been done correctly you may not be allowed to use it on the road.

For the money and hassle it will cost you, just buy a 150cc bike.

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joe_T · Posted: Fri Aug 29, 2008 1:12 pm Post subject:

it should be the same electrics for the engine, as far as I know theres no extra features on a 150cc engine apart from a larger piston and carb. rear disc can easily be installed if it's already on the bike(doubt it will be a disc) if its for the race track or youre allowed to ride a 150 I think you can get away with it.

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J€Di · Posted: Fri Aug 29, 2008 1:34 pm Post subject:

If it's a rear hydraulic disc replacing a cable drum (and most 150s come with twin discs, would you want to do 70mph with a drum on the back?) then the brake lever, master cylinder, and hydraulic hose will need to be swapped out as well.

I still think it's a dumb idea, unless they are also prepared to swap over the whole frame as well because they already know the engine mounts are different.

And if you're going to swap the engine and frame, you might as well keep the plastics on it AND HAVE THE WHOLE 150 BIKE!

I guess it could be cost effective if they can find a 150 that's suffered panel damage and put the plastics from the 50 onto the whole 150 chassis?

But they will still have the problems of licence and insurance.

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jpmacd733 · Posted: Fri Aug 29, 2008 10:41 pm Post subject:

iambeetle · Posted: Sat Aug 30, 2008 1:13 am Post subject: thanks

thanks for the info, it gives me some things to think over. I also found these replacment engines at...
www.partsforchinesescooters.com/asp/gmi/?choice=showCategory&category=1001&classid=1001
(sorry don't know how to make it a link)
they have an 80cc motor that is a direct fit replacment for he 50cc and you can use your original carb. what are your thoughts on this?I have read that some 80cc kits come with new a cam shaft and other parts to work with the 50cc, this replacment should be pretty well built, don't you think? even if its based on the 50cc block.

jpmacd733, I have family in Bridgeport and I'm originally from Farwell, up near Clare. Parents still live there. glad to meet some one from mich riding scoots. Dan

ragnarok · Posted: Sat Aug 30, 2008 1:34 am Post subject:

Someone may correct me on this, but I believe that engine is basically a 50cc with the 80cc upgrade preinstalled- which means that even though the bore is bigger, the stroke is the same and you wont get the punch of a 125 or 150cc. The plus side is, however, all you would have to do is drop the damn engine in and bolt it up. If I were you, I'd find a used 150cc and do some fab work myself- it would be more fun and a bit more satisfying, IMO. But then again, I helped drop a 6-cyl turboed audi engine into a Geo storm for a friends Mech E senior project.

jpmacd733 · Posted: Sat Aug 30, 2008 10:29 am Post subject: Re: thanks

obloguy · Joined: 31 Aug 2008 Posts: 18 Karma: 0

Hi mates,
I have made up me mind to perhaps, accually do thee swap me self.
I am quite small in stature and fit quite well on a 50cc scooter than I do a monstorest 150cc steed.
I have purchased a China made 49.5cc unit already to modify from thee get go and I have read so far that an upgrade to a 70-85cc is not quite enough for an emprovement from the 49.5cc.
I do have a small mig welder that welds steel up to 3/16" that I will use for me conversion because the GY6 mounts are quite different from the 49.5 and 150cc.
Will sell the 49.5cc stuff onto eBay as almost new. (4.9 miles!)
I will use the short 150cc case to retain the 10" wheelset but I do have a question of the 150cc axle shaft being a bit longer plus the difference of rear drum brake size between the 13" 150cc and a 10" wheel size of the 150cc GY6 stuff.
May have to aquire a gear upgrade to make the 10" rim work to be able to post speeds of 50-60MPH
I do like to tinker and modify stuff from me brit blood and I am above legal age by a large bit! Rolling Eyes

Cheers!

Yellow Scooter · Posted: Mon Sep 01, 2008 8:23 pm Post subject:

Yeah.... ok...
But dude, you don't have to get a touring framed bike to have a 150cc under your butt! Have you seen the scoots by Eton? They got one called the Beamer-IV 150cc. It has disc brakes front & rear, a 26mm carb with manual choke (far less finicky than the enricher crapola) and is good for 70mph! It's the same size as the other Beamers I-III...
I'd feel a whole lot safer on that IMPO... Than something I rewelded from a chinese welded frame! Shocked

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jpmacd733 · Posted: Tue Sep 02, 2008 2:59 am Post subject: Re: 150cc engine swap.

obloguy · Joined: 31 Aug 2008 Posts: 18 Karma: 0

So far, I have removed the complete 50cc engine assembly from my project Gysix.
Now, just patiently waiting for that 150cc engine to be delivered this Tuesday.
Engine is not equipted with a carb so I bought a 30mm OKO carb with aluminum intake manifold to use as mock up for 150cc engine mount cross member assembly. I have read somewhere here that some of the 150cc motor mounts were in the way to use that aluminum aftermarket intake manifold so this will be one future problem eliminated from the get go. That 30mm OKO carb maybe too big for the stock bore and stroke but 6 mm increase from stock 24mm shouldnt be that big of a concern will it?
Have to fabricate an exhaust for this 150cc engine. Any recommendations?
Thanks in advance and Cheers! Very Happy

Have to eventually get registered to Image Shack to post pics soon. I have taken some pics so far and will post them up when I get further along in this Gysix project.

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