Older bikes use 630 chain/sprocket pitch and it is getting harder to get. They are also normally non o-ring types which requires messy lubrication
To convert to updated 530 pitch the front sprocket, rear sprocket, and chain needs to be calculated.
Original 630 pitch:
Front: 13 teeth
Rear: 33 teeth
Ratio: 33/13 = 2.5
To convert to 530 system multiply by 6/5:
new Front: 13*6/5 = 15.6 ~ 16 teeth
new Rear: 33*6/5 = 39.6 ~ 40 teeth
new ratio: 40/16 = 2.5 ..... perfect
However I ride in the twisties often, and would like to have more acceleration instead of leisurely cruising speed. So I opted for larger rear sprocket (45 teeth)
desired new ratio: 45/16 = 2.8
Knowing that in the original ratio I cruise at 100kph at exactly 5000RPM the new RPM can be calculated:
old rpm * (new_ratio / old_ratio)
5000 * (2.8 / 2.5) = 5600
So with 13 Front and 45 rear, I would cruise at 100kph at 5600RPM
For the chain, I just buy 120 link o-ring 530 pitch chain and cut accordingly. 530 chains are much cheaper at $70 shipped from ebay.
After changing the chain, I felt that it is much quiter and smoother. And certainly easier to maintain in the long run with much less lubricant splatter. As predicted I now cruise 100kph at 5600RPM
photos:
16T front sprocket JTF513.16 available at Z1Enterprises but I bought it locally from PowerSport Kawasaki in Seaford
Rear Sprocket JTR488.45 from Z1Enterprises. This is the Emgo version which is much cheaper. If you would like to keep the stock gearing ration then the rear needs to be 40 Teeth ie. JTR488.40
Comparison between the sprockets. The front one is an exact match. The rear one is bigger as I had chosen it.
The front sprocket is tight, so no way to use a larger one like 17 or 18. It would hit the guard. 16 with 530 pitch is perfect.
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