So I recently acquired this Goped Bigfoot. I bought it used with a few upgrades. It came with the stock G23LH motor, with a CY29CC Big Bore kit (35mm big bore/2mm stroker crank), Sikk Torque expansion pipe, Mad Dog brakes (drilled rotors, with mechanical calipers/pads), new handle bars/steering stem, new billet deck, 3rd bearing support, and lockout. I have found out that 2 mm stroker cranks are not good, 1mm are optimal, and stock are just about as good as the 1mm. So, I replaced the crank with a stock g230RC crank. It pulls HARD now, and tops out at 27.5 mph, which means the engine is spinning at 14,800 rpm. When I had the crank case apart, I noticed that the previous owner had done some porting in the transfer ports, so that was an interesting surprise. In the mail, I have new tires and a new spindle on the way. The tires have a tread pattern similar to a Toyo R1R (http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.2720/.f). The spindle will be larger, thus having a higher top end, and less acceleration. I figure that since I pull wheelie's all the time, without meaning to, I have the extra power to pull a larger spindle. If I'm still able to reach the 3rd power band, and hit the max rpm, I'll be looking at a 33 mph top speed. On to the pictures!
Basically, I definitely wouldn't have spent the money on it if I wasn't at school. It's really nice to have to fly to the other side of campus at 30 mph!
Soooo I screwed up a wheel today. I'm not exactly sure how it was done, but somehow there was added stress/friction on the rear wheel, when it was put back together. Every time I'd get up to full speed, the rear end would start fish tailing like crazy. I took a look at it, and the bearing had heat up so much that it melted through the plastic wheel. I ordered a used magnesium wheel with new bearings for $25!
[quote author=acedeuce802 link=topic=196101.msg4110757#msg4110757 date=1316051598]
Soooo I screwed up a wheel today. I'm not exactly sure how it was done, but somehow there was added stress/friction on the rear wheel, when it was put back together. Every time I'd get up to full speed, the rear end would start fish tailing like crazy. I took a look at it, and the bearing had heat up so much that it melted through the plastic wheel. I ordered a used magnesium wheel with new bearings for $25!
[/quote]
Probably because your pumping so much power to the tires and it wasn't made for those kinds of speed :lol: 20mph...too fast....LOL
Everyone got mad at us. There are 3 of us at school with gopeds, and the night that I rebuilt the motor, we went racing around the parking lot at 4 in the morning! These things are loud as hell.
Got a new wheel, put on my new tires, and went for a 10 mile ride today. It developed a small air leak (probably at the carb) that is causing a high end bog. It was fun riding around the street's of Ann Arbor, keeping up with cars :lol: I found out that I get somewhere around 50 miles per gallon!
Just dyno'd the 'ped today on an ATV dyno we have at the shop. Wasn't able to log the curve, but it made a peak power of 3.3 horse!!!! I'd guess at somewhere around 16,000-17,000 rpm. 3.3 hp is freaking crazy for a 27cc motor!!
Its around 28. I still haven't gotten the chance to install the new spindle. Sometime after FSAE comp ill turn it down on the lathe. I'll be around 33 mph then
Also, that 3.3 HP was measured on a mustang dyno, so it may have read low!
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