150cc motor mounts/swing arm? By new2scooters (Read 18,606 times)

[sprocket]

I have reversed the intake elbow so it faces forward...

[new2scooters]

Mar 26, 2012 17:39:11 GMT -6 Bashan said:

The bolts are in the same plane. You can eyeball through one and the other one is right in line.

There is some play between the tops of the bumpers and the frame stop. This allows for a surprising amount of forward and back movement of the engine as bumper arm rocks. I think this is designed to protect the engine from thrust forces rather than provide part of the suspension.

The mount does interfere with any carb or manifold that extends back farther than a standard GY6 carb. It's a PITA and I'm trying to design something that will allow intake mods without trying to work around it. Rich

OK, got it. When you say "some" play, what would be considered a "normal" amount to aim for? (Distance from bumper to stop, unloaded so both bumper distances are the same) As for the carb clearance issue, I can see where this will be a problem and I'll keep it in mind on the next build.

Thanks!

[new2scooters]

Mar 26, 2012 18:04:34 GMT -6 sprocket said:

I have reversed the intake elbow so it faces forward...

Thanks for the reply. I have seen this done (online pic's) on some scoots. When reversing the intake does it change the angle the carb is mounted at? If so, any problems with flooding/starving? I will keep this idea in mind though.

[sprocket]

Yes... you need to machine an aluminum plate to go between the elbow and the engine... I raise it about 3/8" and bevel it to about 10degrees..to make the carb level...

[new2scooters]

Mar 27, 2012 10:29:52 GMT -6 sprocket said:

Yes... you need to machine an aluminum plate to go between the elbow and the engine... I raise it about 3/8" and bevel it to about 10degrees..to make the carb level...

Ok, thanks for the info. Sounds simple enough to do.

Bill

[sprocket]

The height depends on the carb clearance.. I always check it first and then machine..

You know measure twice machine once...

the only other unknown is if the throttle cable will reach.. sometimes they do
and sometimes they don't, so you have to replace with a longer one...

Mostly depends on how it is routed...

[scootermax]

Mar 26, 2012 12:05:31 GMT -6 sprocket said:

150cc engines are hung (pivot).. by the top.. you will have to weld bolt points to the frame...and they must be exact. I think the kit is the best way to go

I have known a few guys that have tried this... most wish they had just bought a 150cc...and all spent far more than they planned...

The kits cost about $500!!

www.monstergy6.com/product_MGY6_mounts.htm

Check Utube there are a number of conversions there

Dude, it doesn't cost $500. I just took the parts from 4 different scooters and a Kymco 50cc  with a seized engine. I built a gy6 150cc engine from 3 different motors. (The guts out of a REALLY smooth running X-pro into a no name case that someone had disassembled and never put it back together with a complete transmission and a cylinder head I bought new with a small combustion chamber supposedly for a 125cc  and did a port and polish job on it. I've had it on 3 different engines and you can really feel the difference in power output). Anyways, I built the whole bike with only  about $50 invested in it TOTAL. I had only basic hand tools and did it in my carport in 4 days, welding and everything. That's what i love about these Chinese scooters. There are so many around that parts are usually free just for hauling them out of someone's back yard. 
  You are correct though, you have to get the mounts welded in exactly right or you'll have a crooked bike and those are not fun to ride. Exciting maybe, but not fun. 
  Everybody thinks you can just buy a solution ready made and it will make it easier or more cost effective. It's easy, watch a YouBoob video of some dude in Denver install this really cool kit that has everything you need but is a little pricy. Guess what? This same dude is the one selling the kit. He's been a mechanic for years and makes it look easy. So you order said kit and it just goes downhill fast. I'm the guy that buys your "project bike" or find it at the scrapyard for basically free after you get frustrated with the opposite of an easy build. A lot of people will try throwing more money at it and only get more frustration. 
  4 days though. And that includes a complete engine rebuild, motor mounts, hunting for parts, the kids wanting to know what I'm doing and a vocal woman who doesn't want to park in the sun and will tell me about it at every possible opportunity. With a total of maybe $50 in the parts bikes AND rebuild kit (gaskets, seals, piston & rings) with no special tools, hoists, engine stands, or even air conditioning. You don't have to spend a ton of money to have a fun scooter. A 50cc to  150cc swap is pretty easy. If its Chinese bikes then you usually don't even have go change the wiring. If you get the engine in there straight you'll have a rocket ship.