Hi,
After reading in this thread that some shop in HI had the parts, I tried VTCycles for the 2mm piston and cyl boring, they said they have no source for the part. Anyone got the shop name or a source of the 2mm overbore piston?
I'd be happy to get the work done for a Gyro and report back. If you folks know of any other performance options for 1984 NN50 and 1985/6 TG50 Gyro's I know a group interested folks.
thanks to all!
P.S. VTCycles said they can get a 46mm overbore piston for the Aero 50. Can stock Spree/Elite or Aero jugs be bored that far?
Look for maddog in the memberlist, and email him directly. He wouldn't tell me what shop he was buying them from, but I got the impression that these were the last two. They are made by JCC Piston in Korea... minimum production run from them is 1000 units, when I asked.
Hi,
No answer from maddog, but then my mail could have hit a spam filter....
But here's some good news:
Searching for oversized pistons led me to some international ebay sellers. They have pistons for Honda Visions, and some sellers say the pistons also fit Aero 50's and Elite SA-50's. So I bought two, took a few weeks to get here. When I *visually* compared it with my 1984 Gyro piston, the part looks good to fit once the cyl is bored. Wrist pin size/location is ok, height is ok and to the guy who said to check the ring locating pins, that lines up too. In some past thread, I mentioned using a Spree domed piston in my TG50 Gyro, so I believe this piston would be ok in a Spree too. The piston is thicker walled then the OEM piston. It looks that the inside is about the same as the OEM, so the extra 2mm dia is all in aluminum.... Anyone think that's going to be a problem?
My pistons came from Bikers Domain Limited.
They come as a kit - piston, wrist pin and rings. Cost - about $76 USD for 2 kits. The kits come from std to 43mm (2mm over) and there are also some 5mm/5.5mm and 6.0 oversize - if your cyl can be bored that large.
For those who may be able to locate a US source - the kit came from China, name on the box is SKYH, part number is 935058. It's a 43mm (2mm over size)
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I'm a brand newbian here, but have been lurking for weeks. I popped off my jug and head and measured the I.D. -it measured about 40.8+ millimeters with a digital caliper. I'm pretty new to scoot tuning, but (and there always is) I asked my dad -an old school hot rodder - what I could do to bore out a cylinder about almost 2 millimeters for the 43mm pistons. he seems to think that a hone with a rough stone could be used to get close to the desired mm, and then a medium stone and a final stone to take it to the right diameter. some of his hones are about 4inches long, if kept pretty close to the center of the jug - it could give a reasonably good clean bore. Has anyone ever tried anything like this?
84 aero kind of slowabout53mph 86spree currently junk
it would probably work........But, u only wanna go so big on the bore. take a close look at the cylinder. look between the fins on the cylinder. u bore the cylinder to much, it WILL overheat. u will waste your time and money to watch and listen to your engine sieze up!
