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Yamaha C3 — Performance Followup Loobin’ the Tubes

1 Фев 2015 | Author: dima | Комментарии отключены

Loobin’ the Tubes

Yamaha C3 – Followup

May 1, 2011

I ended up two new sets of weights – one 5g and one 7g (again, to fit in the stock variator) – in order to first hand how they performance. The 7g weights caused the to bog badly – at that gear the bike simply wasn’t enough torque to accelerate or hold top-end speed.

The 5g worked well to improve up to about 30mph; after the acceleration drops off but is to get me up to the peg (about 44mph) on a flat and faster on any downhill. The 5g weights hold speed better going uphill. I now have a understanding of why that is from which has a great explanation of the of the CVT in their 2-… section.

Basically, there is a large the contra spring, that the rear pulley plates together when speed off, essentially “opposing” the weights in the variator in order to (increase?) the gear ratio to for speed. Now that the front are lighter, this spring push back more when speed drops which causes the gear to change more quickly and more power for maintaining

This dynamic also the “floaty” feeling I was getting the 4g weights, as they were not enough to oppose the contra and thus could not maintain speed. I’m going to order a set of 6g Dr. weights and compare those to the 5g – I have a phone with GPS so I should be able to take speed measurements.

With the 5g I was able to ride to my brother’s in Raleigh in just over 30 which is a significant improvement my previous time.

Tires – I ended up doing a bit of research on this, most of was a fruitless search for rolling specifications from manufacturers. It down to either the Michelin or the Pirelli SL26. I decided to go the standard 120/90-10 Bopper on front and rear, as someone on a had graded the rolling resistance on tires as “A”. That was absolutely right.

With the I felt like the bike was me, especially uphill – if you got slow you could actually feel the bumping, and when you let off the throttle, the was swift and decided. The Boppers are and during yesterday’s ride I had to use the much more than because the bike really like it wanted to roll.

Side note: Michelin, you need to work on your tire branding. I was riding a with Reggaes. Now I’m riding a with Boppers.

Not exactly the appealing branding ever, you You’ve got good tires, but I them in spite of the name, not of it – not the best marketing!

So as things currently stand,

removed the restrictor washer for a 4-5 mph in top speed

replaced the variator with 5g 15x12mm Dr. Pulley roller weights for better acceleration and still decent top

replaced the belt with a Kevlar belt, which a sluggish spot from to 30mph that was apparently due to wear

replaced my Michelin with Michelin Boppers, probably gave me 1-2mph and help maintain speed.

reading scootnfast’s site, my task is improving/derestricting the C3′s to gain power. I’ve references to a Jiangwayne pipe appears to work, as well as homemade modifications. Back to the