Guests - If You want access to member only forums on HSO. You will gain access only when you sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
cjac

F 115 Yamaha 4-stroke issues

14 posts in this topic

Hey all,

Any ideas? My F115 Yamaha 4-stroke idles fine, but when I kick it down it goes OK but you'll hear and notice a RPM drop around 4500. It just won't kick into the powerband of RPMs. I get 38ish mph (s/b 43mph), but it just won't kick into the top end. Best I can get while goosing the trim up is around 5-5200k.

I changed plugs, looked around and didn't see any signs of anything leaking and the throttle linkage looked fine. I added a can of Sea Foam, but to no avail, and I did run it enough to get that moving thru the motor. It's almost like a cylendar is missing. Thoughts....or is it off to the shop?

Thanks.....

Share this post


Link to post
Share on other sites

My buddy had an issue with his 80 Yammi earlier this year similar to yours I think it was a sensor for fuel or something that was bad. His is an 02 4 stroke tiller. I tried calling him to ask but most likley hes out on the water already for the evening. If he calls back I'll let you know, or maybe Matt will see this and recall what the problem was.

Share this post


Link to post
Share on other sites

Thanks for the assist!

It sounds and "feels" fuel-related/sensor related. I appreciate the call to your buddy!

Share this post


Link to post
Share on other sites

Must be something with you big city boys and your Yammies LOL. No call back yet he may be up to V this weekend and has crappy reception up there.

Share this post


Link to post
Share on other sites

Cjac,

I would pull your plugs and see if one looks different than the other. If so, I'd check to see if you have spark on all cylinders.

marine_man

Share this post


Link to post
Share on other sites

Chris, I had a similar problem a few years ago. Idle was fine but way low on top end--it was running on three. I had a load of very bad gas and an injector was plugged. I added a canister type fuel filter and haven't had a problem since. Have you looked at your filter under the hood?

Share this post


Link to post
Share on other sites

Thanks guys,

Put the new plugs in last weekend, looked at them again and I couldn't see anything different. Check the air intake, trouble-shot as best I could. So, dropped it off this morning.....here's to an inexpensive bill.

Share this post


Link to post
Share on other sites

Did you check your oil level and if you had a hard primer ball?

Oh well if you have it in the shop we will find out in a month or so. LOL. Just yokin ya man. I hope its a quick and semi painless expense.

Share this post


Link to post
Share on other sites

Well, in and out in a day at $200, not bad.

They did the tank test and ran the diagnostics, turns out it was a clogged injector. I'm guessing a bad batch of gas maybe? Ran fine until my trip to Leech, not the right lake to not have 100% confidence in your motor.

I did the garage stuff, but beyond that I didn't want to mess.

Thanks for the recommendations guys!

Share this post


Link to post
Share on other sites

Man that was quick and fairly painless. Could have been a lot worse thats for sure.

Share this post


Link to post
Share on other sites

Quote:
Man that was quick and fairly painless.

When I bought my rig 5 years ago the post-purchase service from the dealer was something I took into consideration. Service for rigs purchased there jump to the front of the line.

Just a tip and point to consider for those looking to purchase at some point in time.

Share this post


Link to post
Share on other sites

Ya thats a good point. Sad point at my place is the Rangers, Tritons etc. usually jump to the front more. wink

Share this post


Link to post
Share on other sites

Cjac, glad you got fixed for 2 bills. I assume you don't have an inline canister filter as I've not heard of anyone running one having problems. A simple addition and not very costly--way less than a repair. Way back when I worked in the marine world, we installed cannisters on any boat sold with a built-in-tank--some came from the manufacuter already installed.

With the dirtier gas today plus the tiny orrifice on injectors, it's more important now than in the past. I've known quite a few guys with plugging problems in the last few years.

Good luck.

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • Shame on you for questioning  these great and wonderful plans.  Have you no faith?  Besides it's pure nonsense.  She made a lot of claims that her plans would not add anything to the deficit or debt   But we have heard those same claims many times over.  It's a mystery why people still believe that everything is going to be funded through just simply raising taxes on people making over $250,000 a year just because "their " candidate said so When a candidate comes up with more spending ideas and tells you that the "rich" are going to be the ones that are going to fund them ,what they really mean is they're  going to fund them through printing and borrowing. They just use accounting tricks and schemes to hide the cost but I prefer math   Personally, I prefer any candidate I were to support tell us how they're going to get us out of this fiscal mess we're in    
    • I agree he should not have been playing in the world cup.
    • Im going to run my Elite 5 on the dash also, soley as my gps. So that will free up space on the Garmin for the side imaging...Now I cant wait for spring to try out all the new toys haha....I've always heard Garmin were really nice I just never saw any of their units that had the features I wanted and were in my $$ range.. I think I'll be really happy with it...Im curious how the preloaded maps are that come with it (lakevu??) I think its called. It would be sweet if it would take my Garmin upper midwest fishing guide chip, but I doubt it does.
    • I don't think it will adhere to the surface very well under 50 degrees.  Especially on the bottom, it could create some real problems if it doesn't stick very well!
    • Sure wakes ya up when nodding off and that reel goes ZINGGGG!!
    • lol sugar coat it all you want Nick the Gophers are a 7th best team in the Big 10 period. They don't have a meaningful win this entire season and they didn't beat any other team in the big 10 with a winning record except for Northwestern who are 5-4 in conference play but 6-6 overall. That isnt trolling at all, its facts.   I hope they can recruit by selling a trip to the Holiday Bowl this year. Big things happening for the Gophers!
    • that sounds great!!!  they were good pictures too!
    • I use the same set up and I think it's the only way to go.
  • Our Sponsors