mike rousseau Posted July 21, 2012 Report Share Posted July 21, 2012 hey my 2001 honda 40hp is acting up again... idles fine trolled for musky 4-6mph no problem... but only had about 60 percent power... normal top speed is 30mph and i could only get 20... but if i played with the choke i could get 90-100 percent power and speed(27-28mph) i have clients at noon tomorrow and need help real bad... not sure if its an O2 censor or something... anyways any help would be great cause its gotta be fixed by noon tomorrow if possible... both gear and motor oil have been changed recently.... any ideas fellas????? mike Link to comment Share on other sites More sharing options...
lew Posted July 21, 2012 Report Share Posted July 21, 2012 Time to get a Yamaha Mike Link to comment Share on other sites More sharing options...
SlowPoke Posted July 21, 2012 Report Share Posted July 21, 2012 My guess is starving for fuel. Link to comment Share on other sites More sharing options...
Mike the Pike Posted July 21, 2012 Report Share Posted July 21, 2012 Time to get a Yamaha Mike Yup what Lew says ,I have had 3 Hondas and 2 yamahas i prefer the Yamahas. I just love my Yamaha F60 Link to comment Share on other sites More sharing options...
Billy Bob Posted July 21, 2012 Report Share Posted July 21, 2012 My guess is starving for fuel. BINGO..... Link to comment Share on other sites More sharing options...
mike rousseau Posted July 21, 2012 Author Report Share Posted July 21, 2012 From what I found online it is most likely one of my 3 high speed jets is plugged.... So I'm dumping a bunch of seafoam in her and running her... And yes... I wanna just go buy the yammy sitting at Clayton marine tomorrow... Link to comment Share on other sites More sharing options...
Old Man Posted July 21, 2012 Report Share Posted July 21, 2012 Could also be a bad coil on one cylinder. Link to comment Share on other sites More sharing options...
SlowPoke Posted July 21, 2012 Report Share Posted July 21, 2012 Could also be a bad coil on one cylinder. I'm not a mechanic but I was leaning towards fuel starvation because it would restore power to 90-100% when he activated the choke. If the coil on a cylinder was weak, I doubt the choke would revive it. Starving for fuel is running lean, applying the choke balances the air/fuel mixture. Now, what is causing it to run lean... TYBO!! Where are you lol Link to comment Share on other sites More sharing options...
Tybo Posted July 21, 2012 Report Share Posted July 21, 2012 Need more info.When the engine is acting up does it serge. Rpm`s rise and low.And how is the hole shot.Is there any shuddering,Not smooth threw the lower rpm`s. Link to comment Share on other sites More sharing options...
Tybo Posted July 21, 2012 Report Share Posted July 21, 2012 (edited) And why do I keep double posting. Edited July 21, 2012 by Tybo Link to comment Share on other sites More sharing options...
HTHM Posted July 21, 2012 Report Share Posted July 21, 2012 Check your fuel lines to see if they have broken down from the ethanol in gas. Link to comment Share on other sites More sharing options...
Fisherman Posted July 21, 2012 Report Share Posted July 21, 2012 Check your fuel lines to see if they have broken down from the ethanol in gas. Not likely, Honda has had ethanol acceptable fuel lines for at least 16 years. There's some loose crud floating around in there. Link to comment Share on other sites More sharing options...
ecmilley Posted July 21, 2012 Report Share Posted July 21, 2012 Not likely, Honda has had ethanol acceptable fuel lines for at least 16 years. There's some loose crud floating around in there. check the lines anyway, omc as has what they say is ethanol acceptable lines since 90 and they still can cause trouble. my guess is someone is due for carb servicing, pull em and clean them out, also check carb bowls for leakage if they canleak any amount of fuel they can suck air. post some pics if you can seafoam is a great cleaner and additive but 11 years and a million hours you may be getting diry, prevantitive nain, is easier to keep it clean than to fix it once it's acting upthan Link to comment Share on other sites More sharing options...
mike rousseau Posted July 21, 2012 Author Report Share Posted July 21, 2012 Hole shot was brutal unless I kept the choke out a bit... When choked it felt fine and hole shot was 90% normal... Wasn't really surging... But if I put the choke back to normal it would very slowly drop from 28mph to 20... Anyways... Slammed a can of seafoam into 2 gallons of gas and ran her for a bit... Then stopped... Drained the carbs... Then ran it again for a while.... Then I hit the water and it seems better... Something just felt a bit "off" to me... But I'm back to 28-30 mph wich is top speed in my boat... Link to comment Share on other sites More sharing options...
Tybo Posted July 21, 2012 Report Share Posted July 21, 2012 Mike.Since you got alot of work done on the engine this year,And the problem returns I would suggest carb gasket or carb synchronization. When you got it re-built they would have to reset the carbs.One of the screws could have come out of adjustment. Link to comment Share on other sites More sharing options...
aplumma Posted July 21, 2012 Report Share Posted July 21, 2012 If it occurs and you have the time. Remove the covers and expose the carb. opening and place your finger over the edge of the opening of the carbs. while it is running. This will richen the carb. and when you hit the carb starving instead of the rpm dropping they will pick up. Next run the motor 2500-3000 rpms and cover that carb with your hand to make it draw all fuel for 1 second that will make the carb. suck fuel under vacuum rapidly thru the ports and passages. This is sometime enough to free up a piece of crud in a jet. This does not replace a rebuild that is needed but it will help you from burning out a two stroke piston from a lack of lubricant. Art Link to comment Share on other sites More sharing options...
Fisherman Posted July 21, 2012 Report Share Posted July 21, 2012 This does not replace a rebuild that is needed but it will help you from burning out a two stroke piston from a lack of lubricant. Art Honda..4 stroke. Link to comment Share on other sites More sharing options...
aplumma Posted July 21, 2012 Report Share Posted July 21, 2012 Honda..4 stroke. Figured it was however it holds true for all of us antique 2 stroke users. Art Link to comment Share on other sites More sharing options...
pikehunter Posted July 22, 2012 Report Share Posted July 22, 2012 My guess is starving for fuel. You're on the right track. It is frustrating I know had a similiar problem with a Johnson 2 stroke last year after spending more than I wanted to at a repair shop to solve the problem. The mechanic told me to use Shell gasoline and only the top preminum as it does not contain any ethanol and when you read the pump it usually says it does not contain any. Costs more but worth the extra pennies. He also told me not to rely on fuel stabilizers to solve the ethenol moisture problem after I told him I always used Johnson/Evinrude's own brand and stayed away from the cheap stuff but usually ran Pioneer regular gas. Fine for the car he said, not for the boat. Link to comment Share on other sites More sharing options...
tomkat Posted July 22, 2012 Report Share Posted July 22, 2012 You're on the right track. It is frustrating I know had a similiar problem with a Johnson 2 stroke last year after spending more than I wanted to at a repair shop to solve the problem. The mechanic told me to use Shell gasoline and only the top preminum as it does not contain any ethanol and when you read the pump it usually says it does not contain any. Costs more but worth the extra pennies. He also told me not to rely on fuel stabilizers to solve the ethenol moisture problem after I told him I always used Johnson/Evinrude's own brand and stayed away from the cheap stuff but usually ran Pioneer regular gas. Fine for the car he said, not for the boat. I had to replace a black box on my mariner 4 stroke some kind of engine control module and I would lose power after it heated up and it would start running on 2 cylinders instead of 4. Link to comment Share on other sites More sharing options...
Billy Bob Posted July 22, 2012 Report Share Posted July 22, 2012 I had to replace a black box on my mariner 4 stroke some kind of engine control module and I would lose power after it heated up and it would start running on 2 cylinders instead of 4. Not sure if it matter or not..........but I have a 2 stroke VRO Johnson 50hp and it's been GREAT since I got her back in 1985......[/b ]but I ALWAYS run the gas out of it[/b] EVERY fall...... but before I do that I use Stabil fuel stabilizer thru the fuel system during the off season.... Link to comment Share on other sites More sharing options...
mike rousseau Posted July 22, 2012 Author Report Share Posted July 22, 2012 The longest my boat went without running in the last year or more was 2-3 weeks... I don't think fuel and or parts can break down in that amount of time... Link to comment Share on other sites More sharing options...
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