high rev at start

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02 Apr 2018 19:09 #781183 by mnrenfro
high rev at start was created by mnrenfro
My 76 KZ400D exhibits a problem where it revs way too high when it first starts. The throttle cable isn't stuck, so I'm not sure why it does this. Any help is appreciated.

Marshall

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02 Apr 2018 22:16 #781191 by Nessism
Replied by Nessism on topic high rev at start
Sounds like a lean condition caused by a vacuum leaks.
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
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03 Apr 2018 04:33 #781194 by zed1015
Replied by zed1015 on topic high rev at start
Are you sure it's not just when it's on choke.
If so, that is normal.
Otherwise as stated it could be air leaks at the inlet manifold, Sticking choke plunger etc.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





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03 Apr 2018 06:29 #781199 by mnrenfro
Replied by mnrenfro on topic high rev at start
Thanks. It's not the choke plungers, but it could be leaks at the intake manifold. Not sure how to test for a leak there, but I can at least check and make sure the screws are tight.

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03 Apr 2018 09:07 #781214 by ajsfirehawk
Replied by ajsfirehawk on topic high rev at start
After the startup and the engine settles down, shoot a couple quick bursts of starter fluid across the intakes. If if revs up, there is a leak.
79 KZ650 SR
80 KZ1000 Z1 Classic
83 KZ1100 LTD
Z900RS
23 Mach 1
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03 Apr 2018 09:53 - 03 Apr 2018 09:54 #781215 by Patton
Replied by Patton on topic high rev at start
Assure advancer isn't sticking.
Good Fortune! :)
1973 Z1
KZ900 LTD
Last edit: 03 Apr 2018 09:54 by Patton.
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03 Apr 2018 11:27 #781221 by Kollector
Replied by Kollector on topic high rev at start
recheck throttle cable return spring.
cable may be sticky, needing lube.
'83 KZ750 Spectre, '01 ZRX1200R, '03 ZZR1200, '84 GPZ900R, 7 Hondas, 1 Yamaha
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