20 hp 4strk tohatsu won't start without shooting fuel in venturi

obtech

Recruit
Joined
Oct 5, 2015
Messages
1
i am working on a customers 4strk single carb tohatsu. i can shoot gas in carb throat and it will start and run fine. but when i try to cold start, it just won't, The customer obviously had it at another shop, as there is a new abs in the pkg in the boat. But i do not think the abs is bad, as it will warm up after a few minutes. What else is directly responsible for cold start , I am a pretty good tech. but have very little experience with tohatsu. The wire going to the abs Yellow/red. is only positive when i am cranking the motor, is this normal.. can someone tell me anything about the basic starting of this motor.
 

pvanv

Admiral
Joined
Apr 20, 2008
Messages
6,509
The abs enrichens the carb when cold. the power heats it when running to gradually lean out the mix. You can test the abs... should expand the needle as it heats. May well have a clog in the enrichment circuit.
 
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