puffs of smoke from under engine

[WICKED1000R]

:banghead: ok...i guess i have been chasing this prob for about 2 weeks now...ok ski wouldnt go over about 1/4 throttle after about 10 min in the water....so i rebuilt the carb, put all new fuel lines, had all electronics checked, new battery.......ok ......and today i was outside messin with it...and i finnally see a puff of smoke come from under the motor...right where the drain plug is (89 650SX) ....so as i played more with the throttle the more i seen the smoke...and sometimes i just heard the puff but no smoke...so i put my hand down there...and yes its comming from the drain plug.... everytime it would puff ski would fall on its face...then when it stopped ski would rev...just like it should.....what do you think would cause this?? bad spring on the release?? or something worse?? or should i just block it off alltogether?? if i should block it off does anyone sell the block off plate??

Thanks again,
RR

 

[Waste Land]

Yeah, exhaust leak was your gremlin for sure. I'm posting so i can subscribe. I'm curious to see whyt hsi would occure for future refrence

 

[WICKED1000R]

ok...if i should just block off the dam thing...if anyone in the Daytona Beach area has this plate...give me a call...i would love to get the dam thing running for the long weekend...this is killin my arse!! (386)235-2912 i would pick it up in a heartbeat.
Thanks again,
RR

 

[Kny21]

from what I've read the crankcase drains on those things need to be blocked off. They end up corroding and sticking open and they are really not worth having, just pull the plugs and crank while ski is on its side to get water out of the motor. I'm sure Hot Products sells the block-off, hit Magoo up.

 

[SUPERJET-113]

I've owned 3 650SX's, and yes take that crankcase drain unit off and block it. I'd block off your oil injection too if you havent already. Its a nightmare waiting to happen...

My very first ski I bought(88 650SX) in early 1990 fried the oil injector and the ski ran lean and grenaded.

 

[WAB]

I have that crankcase drain blocked off on my 750 x2 motor. They are notorious for going bad and causing problems.

You could prolly make your own block off plate, it's just a triangle shaped hunk of Stainless steel. You could maybe make it out of alum strip from Lowe's, cut some gasket material to fit just as well I think.

 

[SUPERJET-113]

Ya, Ive made them from a piece of 1/8" flat alum and then used some Yamahbond or 3 Bond 1211 to seal them.

 

[Mark44]

I have just drilled and tapped the two holes for a 1/8" NPT pipe plugs to seal them up.

Mark44

 

[bluegtate]

block off plate

watercraftwerks has them for $14.00 part # hp-50-9505 hope it helps

 

[SUPERJET-113]

I have just drilled and tapped the two holes for a 1/8" NPT pipe plugs to seal them up.

Mark44

Ya thats handy if you already have the motor apart..

cause dont want to be tappin' and having shavings go inside your crankcase when the motor is together.

 

[Mark44]

You can drill and tap from the outside and not get any shavings in the motor. You are not drilling all the way through.

Mark44

 

[WICKED1000R]

thanks everyone...for your input..think ill pick up a piece of alum from work and make the plate so i can ride this weekend..i just hope this solves my issues im having.