Honda 50 hesitates/dies at full throttle

[Retcoastie]

Patrick,

I got a "Repair Service Manuals" CD on Ebay that covers most 'BF' models. It has a parts breakdown also.

Capt Jim,

I would look at the idle setting. Sounds like the idle is to low

[Captain Jim]

Thanks for the info, would the idle adjustment change without human intervention? Is this something that has to be adjusted frquently? It seemed like this problrm occurred out of the blue.

Jim

[Retcoastie]

I don't think the adjustment would change suddenly, but could have changed slowly over time and did not show up until it finally got to where the engine died.

The other thing that might be caused suddenly is one of the carbs getting a blockage. Then the other two are not providing enough gas to keep her running. You might have to check all the low speed orifices to make sure they are all clear.

[Captain Jim]

Retcoastie,

Thanks for the tips. I will follow through with your suggestions and other suggestions by rest of team.
Thanks,
Jim

[waternwaves]

Idle adjustment probably has no effect at 1/2 throttle....

something is interrupting fuel feed to the motor.

[Captain Jim]

Waternwaves,

1/2 throtle is ok. When at idle after warm up it quits.

----I have just the opposite problem. My Honda(2005 50 hp) stalls out after being at minimum throtle for a short while. When shifting from forward to reverse or vice-versa it will stall as well. This makes docking an adventure to say the least . Any hints as to what my problem is?-

Thanks,

Jim

[Craig LaForce]

I have had similar problems several times.
It seems most were caused by an air leak into the fuel line somewhere, usually around the gas tank fitting.

Also can be a gunked up carb with either fuel blockage or float malfunction.

Also worth checking the spark advance if it is adjustable.

[PatrickS]

I have had similar problems several times.
It seems most were caused by an air leak into the fuel line somewhere, usually around the gas tank fitting.

Also can be a gunked up carb with either fuel blockage or float malfunction.

Also worth checking the spark advance if it is adjustable.

Unfortunately, the thread has gotten a bit hijacked by a few
other issues, so not sure which symptoms you are commenting
on... I plan to replace my fuel line in any case, as one more
possibility to eliminate (keeping the current line as a backup).

[Timm Miller]

Keep it simple to start out...........get yourself two cans of B-12 from Walmart.......add them to one tank........run the motor up and down the rpm range until the tank is empty......should clear it up. The pick up tubes in the bowls are super tiny and only takes a small amount of gunk to clog them up. I wen through this after one season of the boat in a slip, gas went bad after a while and mine acted the same way. I was ready to tear down the carbs and this was recommended..........cleared up after one tank........give it a shot before you go looking for other problems.

[captainjohn]

Could you give a little more detail on what B-12 from Walmart is? Sounds like a simple fix, assuming it doesn't harm any rubber parts. Also, I posted about my dealer trying to sell me a water seperator, and got replies that it was a waste of money. Maybe not so?

[eric3a]

..

[Catigale]

Patrick - Im guessing you have gunked up your carbs - not a function of old fuel, but dirt that has made its way into the carb.

I would say a carb stripdown is for the intermediate level mechanic from what I have read here...not the first thing you want to tackle mechanically without a good shop backup.

Fair warning - showing up at a shop with a box of parts and saying you worked on it is usually met unsympathetically....

[Timm Miller]

Could you give a little more detail on what B-12 from Walmart is? Sounds like a simple fix, assuming it doesn't harm any rubber parts. Also, I posted about my dealer trying to sell me a water seperator, and got replies that it was a waste of money. Maybe not so?

Berrymans Chemtool B-12....I myself tried various forms and ratios of Seafoam to get it to clear.....no luck..even though I use Seafoam to winterize my Honda. I disconnect the fuel line from the tank and pull in straight Seafoam until it starts to really smoke. Shut it off and drain the bowls in the Spring. Give the B-12 a shot before you reach for a wrench......if you have old gas in your tank, try to run some really fresh gas while you do this.

[PatrickS]

Could you give a little more detail on what B-12 from Walmart is? Sounds like a simple fix, assuming it doesn't harm any rubber parts. Also, I posted about my dealer trying to sell me a water seperator, and got replies that it was a waste of money. Maybe not so?

Berrymans Chemtool B-12....I myself tried various forms and ratios of Seafoam to get it to clear.....no luck..even though I use Seafoam to winterize my Honda. I disconnect the fuel line from the tank and pull in straight Seafoam until it starts to really smoke. Shut it off and drain the bowls in the Spring. Give the B-12 a shot before you reach for a wrench......if you have old gas in your tank, try to run some really fresh gas while you do this.

I'll give the B-12 a try. Thanks.

[Timm Miller]

Most of the things people here have posted are very valid situations for the cause of your problems.....give this a shot first though. I had the same sort of thing happen and this was suggested to me and it worked........plus now I pickle the carbs with Seafoam every Winter vs. just draining them.