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Unread 10-20-2013, 09:31 PM   #11
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Default Re: My G1 clone build

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Originally Posted by slonomo View Post
Great job Gary! Looking forward to learning from you on this build. I have all my parts except the engine. I'm contemplating moving the swing arm back and dropping it, did you decide if you will do this? Also, are you going to use the stock airbox and muffler for now? Anxious to find out how you like the new power! Listen to Sho, he's done this a few times. BTW, nice pictures, they turned out great. Keep em coming!
I don't think I'm going to do anything to the swing arm. I'm gonna build the new motor mount so the engine will sit level. For now I'm leaving the stock air box on but I'd like to build a custom exhaust for it. We will see. I'm still weeks away from that.
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Unread 10-26-2013, 06:21 PM   #12
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Default Re: My G1 clone build

I got the G2 rear axel mounted to the G1 swing arm. I had to make new mounts for the front of the trans. Just cut them down to size and welded them up. I still need to cut the crank down on the motor so I can get the clutch mounted so I can get a better idea of how to build the new motor mount. Any disadvantages to mounting the new motor cradle directly to the swing arm and not using the rubber motor mounts?
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Unread 10-27-2013, 10:16 AM   #13
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Default Re: My G1 clone build

Here is a comparison between the G1 secondary and G2 seconday clutch spring. G2 on the left and G1 on the right. Notice how the G2 one has more coils in it. Also the G1 looks to be a little thicker. It's no wonder that they say not to put the aftermarket stiffer white spring in the G1 and just shim it. Some have reported losing a ton of top end speed after installing it. When compressing both springs I can clearly tell that the G1 spring is alot stiffer than the G2 one. I decided to put the G1 spring in the G2 secondary. Also replaced the three ramp shoes...
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Unread 10-27-2013, 11:06 AM   #14
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Default Re: My G1 clone build

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Originally Posted by Field6565 View Post
I got the G2 rear axel mounted to the G1 swing arm. I had to make new mounts for the front of the trans. Just cut them down to size and welded them up. I still need to cut the crank down on the motor so I can get the clutch mounted so I can get a better idea of how to build the new motor mount. Any disadvantages to mounting the new motor cradle directly to the swing arm and not using the rubber motor mounts?
Did you just cut off the trans mounting ears off the G1 swingarm? Or did you make your own? Looks good!
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Unread 10-27-2013, 11:09 AM   #15
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Default Re: My G1 clone build

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Originally Posted by Field6565 View Post
Here is a comparison between the G1 secondary and G2 seconday clutch spring. G2 on the left and G1 on the right. Notice how the G2 one has more coils in it. Also the G1 looks to be a little thicker. It's no wonder that they say not to put the aftermarket stiffer white spring in the G1 and just shim it. Some have reported losing a ton of top end speed after installing it. When compressing both springs I can clearly tell that the G1 spring is alot stiffer than the G2 one. I decided to put the G1 spring in the G2 secondary. Also replaced the three ramp shoes...
One advantage of the G2 spring is that it can be "clocked" or "preloaded" with those little tabs and holes in the drive hub. I don't know which one is better, you can always try it out and switch it back if you need to. One thing I've heard is that we won't need a stiffer spring with the clone....it'll have way more low end power than we're used to and it'll just power though the backshift.
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Unread 10-27-2013, 12:00 PM   #16
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Default Re: My G1 clone build

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Did you just cut off the trans mounting ears off the G1 swingarm? Or did you make your own? Looks good!
Yes. I had to cut the ears off the swing arm. The G2 trans would not even sit flat on the swingarm because they were in the way. All I did was shorten the ears and move them in. The mounting locations were not even close.


I've been putting some thought into the new motor mount. Any thoughts about getting rid of the stock rubber motor mounts and bolting directly to the swing arm? The rubber mount closest to the secondary had to go also because it was hitting off of the secondary. In The New Guys pics it looks like he bolted to the swing arm.
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Unread 10-27-2013, 12:03 PM   #17
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Default Re: My G1 clone build

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Originally Posted by slonomo View Post
One advantage of the G2 spring is that it can be "clocked" or "preloaded" with those little tabs and holes in the drive hub. I don't know which one is better, you can always try it out and switch it back if you need to. One thing I've heard is that we won't need a stiffer spring with the clone....it'll have way more low end power than we're used to and it'll just power though the backshift.
I'm going to try the G1 spring first and see how it goes. I could always switch it out at anytime and compare the two. I was able to remove both secondaries this morning by not using a puller and just tapping on them with a rubber mallet. They both popped right off.
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Unread 10-27-2013, 12:09 PM   #18
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Default Re: My G1 clone build

I ran the G9 spring (I assume same as a G2) for a while then got a Umax spring which is stronger for the utility cart. Given my G9 spring was likely pretty weak, I had stretched it out before. The umax works with near no preload (when you wind it up) about the same as the stock spring wound up pretty stiff. The more you wind the less it shifts out at part throttle; stays reved up when you let off the gas. This is nice for me because of the cut head and advance key makes it knock when you gas it at low rpm say under 2K, but that partly because of my stock clutch engaging so low. Anyway with 1.3 rockers and umax spring it is working well and rpm stay at about 2500 or higher all the time. I rather it shifted out more at steady low speeds but then it might knock. So when I get a new clutch on I might buy a stock spring and try it as I can raise engagement then with the primary but still let it shift out/down as much as I can until it knocks on regular fuel.

If you run a stock clone then its not as much of an issue, but the more wind in the spring the more rpm stay up at part throttle....so it will be more responsive but take more gas and make more noise somewhat. Great for trail riding, not as nice around homes. A stiffer spring with no hooks to wind will simply be stronger at lower speeds and little less at high speeds, most aftermarket springs are like that with no hooks on end, but most are very stiff and hard to install. This umax spring is much stiffer than the G9 spring and some do sell it as a performance spring. All that said a stock clone will run a stock spring no problem it has much more power, but will still have more response if you crank pressure up.

I used the stock mount just laid a 1.5 square tube under the gen mount and welded it on across, then put 1.5-2" wide bar stock under it and to top of rear mount and welded it up, its in my thread. That leveled the motor out actually the front is lower a little. Make sure the torque cable under the gen is working, though you may not have one, you can make one, it holds engine when high torque to save mounts and not let it move and screw up shifting. I didn't want to chance vibration issues, or I would have taken mounts out and taken balance shaft out of motor too. Some have complained of vibration with no mounts, though you might be able to put rubber in the swingarm mounts somehow to help or use truck radius or car a arm rubber insulated mounts, etc. There seems to be no set answer about vibration.
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Unread 10-27-2013, 08:28 PM   #19
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Default Re: My G1 clone build

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Originally Posted by Field6565 View Post
Yes. I had to cut the ears off the swing arm. The G2 trans would not even sit flat on the swingarm because they were in the way. All I did was shorten the ears and move them in. The mounting locations were not even close.


I've been putting some thought into the new motor mount. Any thoughts about getting rid of the stock rubber motor mounts and bolting directly to the swing arm? The rubber mount closest to the secondary had to go also because it was hitting off of the secondary. In The New Guys pics it looks like he bolted to the swing arm.
I'm going to try and use the rubber mounts somehow, if I use the G1 swing arm. I have the stock G2 swingarm and tonight I lined up the swing arm pivot mounts, they look identical to the G1, might bolt right up. If that's the case I may try to use it. I'd really like to extend and drop it. If I screw it up I can always go back to the G1 swing arm. Do you have access to one, maybe from who you got the rear end from?

I think that if there is a way to use the rubber mounts, that would be best for vibrations. I'll send The New Guy a pm and ask him exactly what he did.
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Unread 10-28-2013, 05:29 PM   #20
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Default Re: My G1 clone build

The New Guy replied

Yamaha G1 Project - Geep1

He made his engine cradle mount to the swing arm with some polyurethane bushings between so there is no metal to metal contact. This is what I will do. I don't see any way of using the stock rubber mount locations, but you could remove them and relocate to fit your new cradle?
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