New jug different, will it work?

[Royale]

I just ordered a new jug for my engine because the old one got lost when I moved. I ordered it off ebay and it came with an intake, new piston and rings too. I also ordered one from gasbikes but it's been on back-order for like 3 weeks now so I gave up and just went the ebay route.

The first thing I noticed is the piston is different in that the wrist pin is lower. The intake has 40mm spacing too.

I have a Skyhawk GT5 motor so will this work if I swap both the piston and jug out instead of just the jug like I was planning?

I'm really hoping I don't have to order another one as I am sick of waiting. I really didn't want a jug with 40mm spacing though because the intake is garbage.

 

[MotorBicycleRacing]

I just ordered a new jug for my engine because the old one got lost when I moved. I ordered it off ebay and it came with an intake, new piston and rings too. I also ordered one from gasbikes but it's been on back-order for like 3 weeks now so I gave up and just went the ebay route.

The first thing I noticed is the piston is different in that the wrist pin is lower. The intake has 40mm spacing too.

I have a Skyhawk GT5 motor so will this work if I swap both the piston and jug out instead of just the jug like I was planning?

Get the right Skyhawk part. Mixing brands will not work.

The only other company selling Skyhawk parts is.
http://www.pistonbikes.com/category-s/5.htm

 

[Royale]

Ok thanks. Hopefully the ebay company will take the other one back.

I just ordered one from pistonbikes.

 

[maniac57]

Personally, I would carefully assemble it and see if it turns over without interference. But then again, I'm cheap and hate waiting for mail order parts.

 

[crassius]

along with diff pistons & barrels, there are diff rod lengths - if you try it & piston smacks the head, you won't be able to return it

 

[Royale]

As long as the crank/conrod are the same from the GT5 to whatever engine this is supposed to fit, I don't see what wouldn't work about it as long as I swap both the piston and cylinder.

If they are different though, then I could understand it not working.

These parts are cheap enough I might as well give it a test fit as long as no one on the boards knows for sure it won't work. I have the other one on the way anyway so all else fails I will just keep it as a spare.

The Colorado weather isn't being very bike friendly right now so I have some time before I can ride anyway.

 

[Royale]

I remember reading somewhere on here that someone on here had a gt5 and was looking for a cylinder that was 68.5mm between the faces instead of 69.5mm because it ran better and he said the ports were better designed. The reason I bought this one off ebay is that it said 68.5 so I assumed it was the correct one for my gt5.

Now that I know it's not a skyhawk cylinder I'm wondering if the 68.5 has any meaning that anyone can back up?

 

[maniac57]

Just assemble it and carefully turn it over by hand to check clearances. It should be easy to tell if it will work or not...