I just recently changed my tires on my 1983 Passport. I was running a 2.5x17 on the front and a 3.0x17 on the rear. I got a really good deal on Ebay for a set of tires and tubes. The new sizes I put on are a 2.25x17 on the front and a 2.5x17 on the rear. I have noticed, unfortunately, that my Passport, which used to get to about 46mph, will now only get to about 42mph top speed. I was thinking of changing the tires again, but I would hate to waste the money. As a suggestion, my friend told me I should put a front sprocket on with one more tooth than stock. I know the front stock gear is a 14 tooth. I have also located where to get a 15 tooth sprocket. Through my investigation, I have been told that by changing the front sprocket with one with one more tooth, that I will gain a little top speed at the cost of a little mid range torque. Can anyone confirm or deny this? Also, could anyone please tell me what I may expect to gain as far as top speed? I know it doesn't sound like much from 46-42mph, but if you look at it on the grand scale I have lost almost 10% of my top speed just by changing to a smaller tire.
Thank you,
Chris
1970-73 C70 Honda Service Manual: http://tinyurl.com/6ebwtw
1970-73 C70 Troubleshooting Guide:
http://tinyurl.com/6ebwtw (scroll to sec.7.1 page 101.jpg)
1980-83 C70 Honda Service Manual: http://tinyurl.com/hu42c
1980-81 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec.18-1 page 170.jpg)
1982-83 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec. 20-28 page 205.jpg)
1980-81 C70 Maintenance Schedule: http://tinyurl.com/z4zn6
1982-83 C70 Maintenance Schedule: http://tinyurl.com/hw35c
More resources for C70 Passports and Cubs:
http://www.shlaes.com/Vehicles/Scooter.htm
http://www.velodrome.com/HondaC70/HondaC70.html
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