80 hp four stroke yammy!

[torch]

I have one in the shop that had been to about 10 shops with a miss. I have done a compression test and all cylinders are good. It misses on 1 an 3. It really acts like a fuel issue instead of fire. I cleaned the carbs and there was a little varnish in all of them but not bad. I am running some seafoam through it now and I hope it clears up. Anyone had a similar problem?

[Speck]

I put a remote fuel tank in the front of my boat a while back. The longer fuel line along with the online fuel filter seemed to make mine miss like it was starving for fuel. After trying several different fixes, I just used the tank in the back of the boat and it runs fine ever since

[Wannabe...]

Spark gap? Fuel pressure? ECU problems?

I'm betting on plugs or gaps which is an easy check. Past that, ECU.

Wannabe...

["G"]

bad coil packs ?

[torch]

Its firing fine, it really acts like a fuel issue. Its on a 2072 F&F boat with a 30 gallon plastic tank. Was some water in the tank and I cleaned it really good. Went an put 5 gallons of fresh gas and a 16oz seafoam. New plugs WB and they are set. I can pull off #1 wire and no difference also #3 but will knock the crap out of you with fire. 1 and 3 have a solenoid on the carb and that might be problem.

[Wannabe...]

Ask Sat to hold #3, then #1 and see if there's any differnce in spark.

Wannabe...

[jimmydee1]

This, from the guy who stores dead batteries in a flash light - SEAFOAM will do the trick.

[Wannabe...]

This, from the guy who stores dead batteries in a flash light - SEAFOAM will do the trick.

This from a guy that's been AWOL for a week.

Seafoam may help, but it doesn't sound like it's gonna clear it up since it's limited to 2 cylinders.

Wannabe...

[crappiholic]

I put my money on the ethalnol. You might give RJ at RJ's Outboards in Flowood a call. His number is listed on the motor repair thread. He is usually very helpful.

[crappiholic]

For those of you that have neve tried Seafoam, it will be the best $9.00 you ever spend. I have 2-26 gal tanks in my boat and everytime I fill them up, I put a whole can in each one. My motor mechanic and the folks at Seafoam said to do it. No problems yet.