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  Difference between Yamaha Prime-Start and auto choke

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Author Topic:   Difference between Yamaha Prime-Start and auto choke
jimithing posted 05-28-2002 02:56 PM ET (US)   Profile for jimithing   Send Email to jimithing  
I have a 1999 C50 pre-mix and a 1999 30hp oil injected yamaha. Both are electric start. Do both these motors have auto-choke AND Prime-start or does one have one yet not the other? As I understand it the auto choke is initiated by depressing the key while starting the motor....this works on the 30 but not on the 50(maybe not available because it is not oil injected?)The 50 on the other hand has Prime start which electronically controls the idle only after it is started, it does not seem to have the ability to auto-choke when you depress the key at the remote while starting. Just wondering if I have a bad wiring harness here or if the dealer forgot to hook something up, or if I am crazy. Thanks for all the help in advance.
jimithing posted 05-29-2002 03:32 PM ET (US)     Profile for jimithing  Send Email to jimithing     

any takers

Steve Leone posted 05-29-2002 09:48 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
sounds like you have two different systems there. check to see iff they both have choke solenoids (conventional) or primer solenoids. if the 30 has a choke solenoid it will activate (if the wiring is hooked up right)when the key is depressed in the "on" or "start" position. the 50 however may have a primer solenoid instead. this shoul however work the same way. if the 50 does`nt have either then they are just momentarily advancing the throttle but i am not familar with this set-up. steve out.
jimithing posted 05-31-2002 11:33 AM ET (US)     Profile for jimithing  Send Email to jimithing     

Found the 99 catalog and the C50 should have prime start. Prime start is an electric self choking sytem that works by squirting fuel into the carbs when you depress the key switch in the ON or START mode. Only reason I noticed it was when I bought a non current 99 30 and it had really makes startinga lot easier and has got to be easier on a a 2 stroke motor since the mixture is introduced immediatly upn startup as oppsoed to having to wait for the engine to turnover and pull the gas to the carbs. anyway.... the dealer doesnt know whay it doenst have it since it say it should...nedd to call yamaha customer service with the serial number to determine how it came from the factory. That should answer my question I hope

Steve Leone posted 05-31-2002 11:46 AM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
i have always prefered the conventional choke system ( choke butterflies) as opposed to the primer solenoid style. i do not believe the gas gets into the engine any quicker (maybe a mili-second) either. i have had problems with o.m.c. primer systems. in peticular: 1) the hoses loosening, cracking, leaking or falling off. 2) the unit is expensive to repair or replace if it fails internally and 3) they are a hard to get at sometimes. steve out.

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