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Guffer reacted to ESGWheel's post in the thread Mercruiser 120 poor starting with Like.

Post checking if good compression and spark etc. from above, and still have the 30 sec. run then stall, check this: post stalling, take...

Apr 7, 2025
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Guffer reacted to airshot's post in the thread Mercruiser 120 poor starting with Like.

Your on the right track, new plugs does not mean they are firing hot....a nice blue spark that jumps an 1/8" or greater gap is needed...

Mar 30, 2025
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Guffer replied to the thread Mercruiser 120 poor starting.

Many thanks for all the responses. I will go again tomorrow and check everything, filters and plugs are new so should be good. I have a...

Mar 30, 2025
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Guffer reacted to Scott06's post in the thread Mercruiser 120 poor starting with Like.

Would seem based on this it is not getting fuel is fuel getting to the carb. If it is dig into the carb. I recently put a 4 bbl...

Mar 30, 2025
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Guffer reacted to Bondo's post in the thread Mercruiser 120 poor starting with Like.

Ayuh,..... Welcome Aboard,...... It sounds like it's running outa gas, so start with the carb,....

Mar 30, 2025
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Guffer posted the thread Mercruiser 120 poor starting in Mercury MerCruiser Sterndrives & Engines.

Hi there, I recently had head worked on to improve compression on cylinder 4. On putting it back together it, it’s starting but petering...

Mar 28, 2025

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