Clean the carbs again and make sure the jets are removed and cleaned well.
70 2 Stroke Idle
My 03 Yamaha 2 Stroke dies idling. Boat runs great when under power both WOT and going down the canal but it won't idle for more than 30 seconds to a min before it dies. I replaced the fuel pump, water seperator, fuel filter, spark plugs about 10 months ago and the carbs cleaned about 6 months ago. The bulb is holding pressure, not sure what the issue could be. Any input is appreciated.
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^^^X2. Most people really are not that good at cleaning carbs well.Clean the carbs again and make sure the jets are removed and cleaned well.
I didn't even try to clean the carbs, took it to a shop to have it done.^^^X2. Most people really are not that good at cleaning carbs well.
Was really hoping it wasn't the carbs and a quick fix but it never is
I would save yourself the cash and clean them yourself. It’s not very difficult and doesn’t take much time.
Carbs are easy, shops tend to do a crappy job so I do them myself. Been there, done that!I didn't even try to clean the carbs, took it to a shop to have it done.
Was really hoping it wasn't the carbs and a quick fix but it never is
Agreed. As a shop owner, I do all carb jobs myself otherwise they would need to be done again. In doesn't make sense; go slow and methodical and there's nothing to it.Carbs are easy, shops tend to do a crappy job so I do them myself. Been there, done that!
I sent a buddy’s boat to a local shop a few months ago for carb cleaning and kits to be installed and had to end up doing it again myself because the guy didn’t even clean the jets out and the boat wouldn’t get on plane. RidiculousAgreed. As a shop owner, I do all carb jobs myself otherwise they would need to be done again. In doesn't make sense; go slow and methodical and there's nothing to it.
One thing to try before taking the carbs apart: Remove the idle mixture needle screws and spray carb cleaner in the hole , then blow it out with compressed air. It only takes a few minutes and may be worth a try.
Carb cleaner will cause the o rings and gaskets to swell and is not recommended to come into contact with them. I wouldn’t do that.One thing to try before taking the carbs apart: Remove the idle mixture needle screws and spray carb cleaner in the hole , then blow it out with compressed air. It only takes a few minutes and may be worth a try.
What do y’all think about the chem dip stuff? I used it with success, but did not have the gunk in the picture above.
It’s what I used to clean mine and his after this photo. Great stuff!What do y’all think about the chem dip stuff? I used it with success, but did not have the gunk in the picture above.
Should I buy the repair kit for each carb or just clean them up?
If they haven’t been rebuilt in a long time I’d do it right and buy the Yamaha kits and clean them really well with ChemDip and carb cleaner. Don’t get the carb cleaner on the bowl gaskets or they’ll swell up and you won’t get them in. Make sure to remove the jets and clean the passages with a welding torch tip cleaner. Don’t force the wire in any holes or you will change the tolerance and cause issues.Should I buy the repair kit for each carb or just clean them up?
Time to add an inline filter too.I sent a buddy’s boat to a local shop a few months ago for carb cleaning and kits to be installed and had to end up doing it again myself because the guy didn’t even clean the jets out and the boat wouldn’t get on plane. Ridiculous
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By the way nice pics. I have tried taking pics of the jets in my 30 when I had it apart and they looked like hell. I could never get anything to focus like you did at all.
The Yamaha 70TLRs have an inline filter that can be backflushed if in a pinch. They are about $25. Always buy Yamaha parts, no ebay chinese crap.Time to add an inline filter too.
By the way nice pics. I have tried taking pics of the jets in my 30 when I had it apart and they looked like hell. I could never get anything to focus like you did at all.
That is the i will just throw it in an ultrasonic cleaner mentality
I sent a buddy’s boat to a local shop a few months ago for carb cleaning and kits to be installed and had to end up doing it again myself because the guy didn’t even clean the jets out and the boat wouldn’t get on plane. Ridiculous
View attachment 89952 View attachment 89954 View attachment 89956 View attachment 89958
Naa, that’s the “I’ll tell this guy I’m rebuilding the carbs and just replace the bowl gaskets and nothing else, not even cleaning them then blame the rebuild kits for no power”...I took them apart myself after that and couldn’t believe it.That is the i will just throw it in an ultrasonic cleaner mentality
I used to have that motor and had the same issue - ran fine with some throttle but wouldn't idle without dying.
We ended up cleaning the carbs three times without fixing the issue. Finally took it to a local shop I use some and it was a different issue - my memory is a little hazy but there was some screw that was set at the factory and was then tamper-resistant due to EPA regs. I think it was the O2 mix but don't quote me on that. It ran fine when new, but after a couple hundred hours it needed adjustment so they had to drill out the screw to be able to adjust it.
Remember, this was 8+ years ago so I probably got something wrong but it may not be the carbs.
We ended up cleaning the carbs three times without fixing the issue. Finally took it to a local shop I use some and it was a different issue - my memory is a little hazy but there was some screw that was set at the factory and was then tamper-resistant due to EPA regs. I think it was the O2 mix but don't quote me on that. It ran fine when new, but after a couple hundred hours it needed adjustment so they had to drill out the screw to be able to adjust it.
Remember, this was 8+ years ago so I probably got something wrong but it may not be the carbs.
The 70TLR has adjustable idle air screws on all three carbs and all three carb linkages can be adjusted and synchronized too. I think you are remembering the 90TLR, just got done with carbs on one and only one carb has an adjustable idle air screw and linkage for butterfly. The other two are fixed. The idle air screws aren’t adjustable screws, they have a smooth head that’s flush with the carb body, sounds like what you are referring to.I used to have that motor and had the same issue - ran fine with some throttle but wouldn't idle without dying.
We ended up cleaning the carbs three times without fixing the issue. Finally took it to a local shop I use some and it was a different issue - my memory is a little hazy but there was some screw that was set at the factory and was then tamper-resistant due to EPA regs. I think it was the O2 mix but don't quote me on that. It ran fine when new, but after a couple hundred hours it needed adjustment so they had to drill out the screw to be able to adjust it.
Remember, this was 8+ years ago so I probably got something wrong but it may not be the carbs.
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