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I'm posting this for my fellow Yammy owners that suffer the stares and coughs from innocent bystanders when you throw out a smoke screen every time you start your ride. I have suffered this humiliation for 2 years with the boat I bought used, and finally cured it with $7 of parts. Here's my tip: if your engine smokes alot on start (small cumulus cloud), maybe has a rough idle, but otherwise runs OK at speed, do the following FIRST before you try any of the 59 other smoke related fixes:
1. REPLACE THE 2 OIL PUMP O-Rings. They are the O-rings shown behind the oil pump on the online Yamaha parts diagram. It takes all of 15 minutes. 2 bolts remove the pump. One O-ring is on the back of the pump; the other is on the circular spacer that fits around the pump drive shaft in the block. You'll have to gently coax the spacer out of the block with a screw driver to get to it.
2. Then make sure the oil pump linkage is adjusted correctly. With motor off and throttle plates completely closed (which they should be since you're not stepping on the gas) shorten the linkage end so that the oil pump lever is just touching the stop-pin. Another 5 minutes work, maybe.
My story: I have a 2001 VX225 VMax (otherwise known as the venerable OX66) on my Skeeter. I bought the boat 2 yrs ago and it has smoked like a brush fire every start, cold or warmed up. The idle has been rough, and it has recently started to die on starting unless I immediately punched it. Other than that, it runs good on plane and does 68 mph+. It does seem to use more oil than one would think normal, but I never really measured it.
OK, I'm a tinkerer, and have spent alot of $$$ and laid awake in bed going thru possible causes for months. Here's what I've done thus far:
-new O2 sensor $300
-new LP fuel pump $60
-new plugs,twice...$20 X 2
-checked filter in VST (it was cleaner than a whistle) ...$28 gasket
-removed injectors and had tested/cleaned - $108
-checked fuel press regulator screen and diaphragm (was clean and OK)
Then I finally read posts here by RODBOLT17 on similar issues. The man is a certifiable Yamaha genius. He apparently attended MIT and received his PhD in Yamaha-ology. His posts enlightened me to the sinister nature of those 2 little oil pump O-rings. Frankly, I thought my engine was doomed to smoke its way thru the remainder of its life, but $7 later, VOILA! Cured!
A final note: some of thie stuff I did should be done periodically. I did have a bad LP fuel pump (slight leakage), but it was not causing the smoke. I did clean my O2 sensor before replacing, but went ahead and replaced it hoping that was the magic bullet. Nope. Didn't improve anything. I will say the injector cleaning made a noticeable difference in the performance and I'm glad I did that. Much more pep. I took them to InjectorRX in Houston (Chris did them in one day for $18/injector). He used ultrasonic bath to clean and replaced filters and o-rings on each. If your injectors are dirty, mail them to Chris. No amount of gas additive will remove the particulate crap that gets in them and plugs them up.
So, if you have an older 2 cycle that smokes alot on start, but otherwise runs OK, try the 2 things I mentioned FIRST. If that doesnt help, you are only out $7 and a few minutes work.
1. REPLACE THE 2 OIL PUMP O-Rings. They are the O-rings shown behind the oil pump on the online Yamaha parts diagram. It takes all of 15 minutes. 2 bolts remove the pump. One O-ring is on the back of the pump; the other is on the circular spacer that fits around the pump drive shaft in the block. You'll have to gently coax the spacer out of the block with a screw driver to get to it.
2. Then make sure the oil pump linkage is adjusted correctly. With motor off and throttle plates completely closed (which they should be since you're not stepping on the gas) shorten the linkage end so that the oil pump lever is just touching the stop-pin. Another 5 minutes work, maybe.
My story: I have a 2001 VX225 VMax (otherwise known as the venerable OX66) on my Skeeter. I bought the boat 2 yrs ago and it has smoked like a brush fire every start, cold or warmed up. The idle has been rough, and it has recently started to die on starting unless I immediately punched it. Other than that, it runs good on plane and does 68 mph+. It does seem to use more oil than one would think normal, but I never really measured it.
OK, I'm a tinkerer, and have spent alot of $$$ and laid awake in bed going thru possible causes for months. Here's what I've done thus far:
-new O2 sensor $300
-new LP fuel pump $60
-new plugs,twice...$20 X 2
-checked filter in VST (it was cleaner than a whistle) ...$28 gasket
-removed injectors and had tested/cleaned - $108
-checked fuel press regulator screen and diaphragm (was clean and OK)
Then I finally read posts here by RODBOLT17 on similar issues. The man is a certifiable Yamaha genius. He apparently attended MIT and received his PhD in Yamaha-ology. His posts enlightened me to the sinister nature of those 2 little oil pump O-rings. Frankly, I thought my engine was doomed to smoke its way thru the remainder of its life, but $7 later, VOILA! Cured!
A final note: some of thie stuff I did should be done periodically. I did have a bad LP fuel pump (slight leakage), but it was not causing the smoke. I did clean my O2 sensor before replacing, but went ahead and replaced it hoping that was the magic bullet. Nope. Didn't improve anything. I will say the injector cleaning made a noticeable difference in the performance and I'm glad I did that. Much more pep. I took them to InjectorRX in Houston (Chris did them in one day for $18/injector). He used ultrasonic bath to clean and replaced filters and o-rings on each. If your injectors are dirty, mail them to Chris. No amount of gas additive will remove the particulate crap that gets in them and plugs them up.
So, if you have an older 2 cycle that smokes alot on start, but otherwise runs OK, try the 2 things I mentioned FIRST. If that doesnt help, you are only out $7 and a few minutes work.
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