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Author Topic: CB750 K4 chain length -smaller front sprocket  (Read 1234 times)

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Offline BobR

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CB750 K4 chain length -smaller front sprocket
« on: April 14, 2018, 12:11:33 PM »
  Ok been a while since I posted. Bike has been on hold. Getting ready to buy a few things to finish up -one is a front sprocket. Been thinking of going down a tooth to a 17.  Question- using stock size 48 rear with the 17 front will I need a shorter chain? TIA Bob
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Offline Bankerdanny

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Re: CB750 K4 chain length -smaller front sprocket
« Reply #1 on: April 14, 2018, 12:15:50 PM »
1 tooth shouldn't require a shorter chain, but it depends how stretched your current chain is.
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Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline BobR

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Re: CB750 K4 chain length -smaller front sprocket
« Reply #2 on: April 14, 2018, 12:20:34 PM »
Quote from: Bankerdanny on April 14, 2018, 12:15:50 PM
1 tooth shouldn't require a shorter chain, but it depends how stretched your current chain is.

  Thanks! New rear sprocket and chain. I'll order a 17 tooth and 100 link chain then. Bob
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Offline PeWe

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Re: CB750 K4 chain length -smaller front sprocket
« Reply #3 on: April 14, 2018, 01:04:28 PM »
100 links chain is perfect for your bike. 17 or 18, 48 rear.
The modern o/x-ring chains do not stretch as the old weak chains.
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline BobR

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Re: CB750 K4 chain length -smaller front sprocket
« Reply #4 on: April 14, 2018, 01:56:51 PM »
Quote from: PeWe on April 14, 2018, 01:04:28 PM
100 links chain is perfect for your bike. 17 or 18, 48 rear.
The modern o/x-ring chains do not stretch as the old weak chains.

  Thanks! The weathers starting to break around here - parts are ordered! :) Bob
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Reality is merely an illusion, albeit a very persistent one. Albert Einstein
 CB750K4(F2 engine)
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