J175GLEUC 175HP Johnson Fast Strike

by Marty
(Dexter, MI)

175HP Johnson Fast Strike

175HP Johnson Fast Strike

Just bought a used Four Winns Horizon 190 boat with 1997 175HP Johnson Fast Strike. Guy said the motor ran great. Ran it on muffs in his yard, no problems. No lake nearby to test drive it in.

Towed it 350 miles home, took on lake, and it runs a little rough at low speeds but ok. Runs great and strong up to ~3/4 throttle. Over that it bogs like it's not getting fuel. Pulled cover and airbox. All throttle plates moving in unison. Engine looks like new under the cover. No marks on bolts as if it's been worked on, etc. Contacted the seller. He insists it worked perfect last year, but he won't commit that he went full throttle. Says he went about 30 mph and "that was fast enough". Sounds like BS to me and now I'm stuck.

Any ideas on how to troubleshoot and fix this bog?

Marty



Compression was between 92 and 98 on all cylinders. I don't have the record of which cylinders had which compression.

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May 18, 2022
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by: Rodney

Had same issue with older 1976 Evinrude. Ran great in a barrel but horrible on the water. Without the backpressure of being on the water under load you just can't be sure. Had to have carbs redone and jets sized to run right. Cost about $250 and a week at local shop to get it right but ran great after that. I would definitely have carbs rebuilt and link n sync done. Possibility it could be as simple as fuel pump or primer bulb one way valves bad too. Check that 1st as it is much cheaper

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