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Dominick
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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I have a 1977 Johnson 115hp motor that runs great at high speed

Customer Question

I have a 1977 Johnson 115hp motor that runs great at high speed and high idle. but in low speed anything below 2500rpm it dies?? please help? Thanks,
Submitted: 11 months ago.
Category: Boat
Expert:  Jason replied 11 months ago.
Hi Roger, my name is ***** ***** I will be helping you today. Typically when the engine will not idle that would mean the idle jets and ports inside of the carburetor are clogged up, and not flowing fuel. Has this engine been sitting for a long time? When did it last run correctly?
Expert:  Jason replied 11 months ago.
Hi Roger, are you still with me?
Customer: replied 11 months ago.
we cleaned the carb, it runs great at high idle.
Expert:  Jason replied 11 months ago.
Has this engine been sitting for a long time? When did it last run correctly?
Expert:  Jason replied 11 months ago.
I tried to accept your request for phone service but there seems to be an issue with your payment. You will need to get in touch with customer service either by emailing***@******.*** or using the "contact" button on your screen.
Customer: replied 11 months ago.
We cleaned the carb, it looks good but still will not idle at low rpms.
Expert:  Jason replied 11 months ago.
Have you checked compression and spark output. Spark output needs to be checked with a timing light. Compression would need to be checked with a compression gauge. Compression must be 90 psi or better. Have you checked those items?

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