engine RPM's

engine RPM's 14 Dec 2006 06:51 #99514

KZSteelers Topic Author Offline User Posts: 19 Thank you received: 0	I have a 1980 KZ650LTD. When I'm cruising at 60, its turning about 5000 RPM's. This seems like its screaming. Is this a normal crusing RPM?
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engine RPM's 14 Dec 2006 07:03 #99516

The Gringo
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Â¡Usted no necesita otra motocicleta!
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Sounds pretty much normal. I have always thought the 650's needed a 6th gear. One thing you might try is adding one tooth to your countershaft sprocket. You will sacrifice a little out of the hole acceleration, but it makes the bike nicer at cruising speed.

Andy
Akron, Ohio
80 Z-1 Classic-Sold
84 GPZ1100
79 KZ 1000 LTD
78 KZ 1000 A2
77 KZ 1000 LTD-Sold
76 KZ 900 The definition of a barn find
76 KZ 900-Sold gone to Denmark
KZ 750 times 3, KZ 650 times 8 Sold 1 down to 7
KZ 550 times 2 80 440LTD-Sold
81 CSR 305-Sold 81 Yamaha XS650 Special

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engine RPM's 14 Dec 2006 07:23 #99522

OKC_Kent Offline User Posts: 1717 Thank you received: 20	My '78 650 has the stock gearing, 16/42. It turns about 4700 rpm at 60. I think the LTD's are a bit different, maybe due to a different rear wheel?? But like Gringo said, go up a tooth on the countershaft sprocket. Oklahoma City, OK 78 KZ650 B2 82,000+ miles
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engine RPM's 14 Dec 2006 07:46 #99526

madderkaw Offline User Posts: 83 Thank you received: 8	My 80 650 LTD is doing 70 at 5000 rpm's. 60 is closer to 4500. It still needs another gear though.
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. 14 Dec 2006 07:59 #99530

JMKZHI Offline Platinum Member Posts: 2429 Thank you received: 48	del
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engine RPM's 14 Dec 2006 13:02 #99599

freebyrd24 Offline User Posts: 468 Thank you received: 4	My stock 650SR turns 5500 at about 55mph. I wish they came with a 6th, i love the power off the line though - 1981 KZ1000-K1 LTD - Long term project 1075cc Kit - New Wiseco Pistons Sold: - 1978 kz650 SR, 4-1 Vance and Hines Full Exhaust, Dyna-S Ignition, Accel Coils and Wires
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engine RPM's 14 Dec 2006 13:04 #99600

mariozappa Offline User Posts: 901 Thank you received: 8	I went with a 38 tooth on the rear and really takes away the want for a sixth gear. I haven't noticed any loss off the line though. 1977 KZ650C1 and the KZ650/KZ750 Conversion
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. 14 Dec 2006 13:18 #99601

JMKZHI Offline Platinum Member Posts: 2429 Thank you received: 48	del
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engine RPM's 14 Dec 2006 15:51 #99618

steell Offline User Posts: 6850 Thank you received: 207	JMKZHI wrote: Hey Gringo, does your 650-CSR have the stock sprockets? I've also got the 81 KZ650-CSR, which has a 13T front & a 33T rear - it seems like that would be a world of difference from some of the others having the 16T/42T setup. Another gear would be nice. JMK. Sounds like your bike uses a 630 chain while the others use a 530 KD9JUR
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engine RPM's 14 Dec 2006 16:44 #99635

77KZ650 Offline User Posts: 1397 Thank you received: 7	when my 77 was stock, it would be revving 5000 at 100km/h (about 60mph) 6000 rpm=120 km/h, 7000=140km/h ect... Scott Post edited by: 77KZ650, at: 2006/12/14 19:44 07 MDP Rookie of the Year 01 ZX-12R street/drag bike. 8.97 @155.7 pump gas, dot tires, no bars, no power adders. top speed in the 1/4: 161MPH
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. 14 Dec 2006 18:02 #99651

JMKZHI Offline Platinum Member Posts: 2429 Thank you received: 48	del
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engine RPM's 15 Dec 2006 07:21 #99752

steell
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JMKZHI wrote:

By steell:

JMKZHI wrote:
Hey Gringo, does your 650-CSR have the stock sprockets? I've also got the 81 KZ650-CSR, which has a 13T front & a 33T rear - it seems like that would be a world of difference from some of the others having the 16T/42T setup. Another gear would be nice. JMK.
steell wrote:
Sounds like your bike uses a 630 chain while the others use a 530
Yep, yer right about my chain; I don't know about the others. JMK.

I bet that your bike don't have a kickstart either

The 650 switched to a 630 chain, no kickstart, and a HyVo cam chain around 81, previous models had a kickstart, roller cam chain, and 530 chain. A 750 jug, pistons, and head, would bolt right on your bike

KD9JUR