My 701 died yesterday...

tnj4life

tnj4life

Location
Marshall, AR
I was fixing to load up yesterday and call it a day but then I remembered I had a little gas left. Decided to ride more. My ski just dies. Had to swim it back to the trailer. Motor turns over slowly, won't run. Truck gets stuck (flippin 2wd) so I get a rocking motion going then hold it on the floor spraying my fx1s fresh paint with rocks and mud (got out though). Take it home for a compression check, 1st cylinder 25 psi and drops off fast. Uh oh. Tear it down and find a piece of steel imbedded in my piston and a huge groove down the intake side. Checked my crank and the back rod has tons of up/down play and metal shavings in the bottom of the case. All this from a stock 701 in a fx1. 4th tank of fuel I have run in it, im soon to be stand up poor. Fun while it lasted.

Question is, would I be better off buying a short block off a trust worthy person or build it, money wise? These motors are so simple compared to the quads ive rebuilt.
 

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WFO Speedracer

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
tnj4life said:
It it had been a 550 it wouldnt have had the power to sling a rod, right Wfo?
Click to expand...

We can debate this all day long,I can tell you I have a very large stack of broken cases,cylinders,intakes,ex manifolds etc to take to the scrapyard every year here and its 99% Yamaha stuff in there. I have more blown Yamaha engines in here to build at present that I do Seadoo engines and I have zero blown Kawi engines ,take that to mean whatever you will.:headbang:
 
ATS_Aaron

ATS_Aaron

X-
Location
Shady Shores, TX
tnj4life said:
Question is, would I be better off buying a short block off a trust worthy person or build it, money wise? These motors are so simple compared to the quads ive rebuilt.
Click to expand...
I think you lost a crank bearing, and the transfer ports flung the pieces onto the top of your piston. Did it ever act hard to start before this? Seem like you had to charge your battery often?

The rebuild you need is pretty simple: new crank (Hot Rods new ones are under $500 from a few places, SBT ones are dirt cheap like $200) a 84mm piston set and a rebore to 84mm...hey, might as well pick up a few CC's of displacement while you are in there, right? How bad is your cylinder head dome?

Aaron
 
WFO Speedracer

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
ATS_Aaron said:
I think you lost a crank bearing, and the transfer ports flung the pieces onto the top of your piston. Did it ever act hard to start before this? Seem like you had to charge your battery often?

The rebuild you need is pretty simple: new crank (Hot Rods new ones are under $500 from a few places, SBT ones are dirt cheap like $200) a 84mm piston set and a rebore to 84mm...hey, might as well pick up a few CC's of displacement while you are in there, right? How bad is your cylinder head dome?

Aaron
Click to expand...

Prob is I believe that was a ported Jetworks stroker ,well at least it was once upon a time.:261:
 
tnj4life

tnj4life

Location
Marshall, AR
WFO Speedracer said:
We can debate this all day long,I can tell you I have a very large stack of broken cases,cylinders,intakes,ex manifolds etc to take to the scrapyard every year here and its 99% Yamaha stuff in there. I have more blown Yamaha engines in here to build at present that I do Seadoo engines and I have zero blown Kawi engines ,take that to mean whatever you will.:headbang:
Click to expand...

You just chill Wfo, im just jerking your chain :pokey:. I will fix my yamahas over and over just because I like the low end snap (no pun intended).
 
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tnj4life

tnj4life

Location
Marshall, AR
ATS_Aaron said:
I think you lost a crank bearing, and the transfer ports flung the pieces onto the top of your piston. Did it ever act hard to start before this? Seem like you had to charge your battery often?

The rebuild you need is pretty simple: new crank (Hot Rods new ones are under $500 from a few places, SBT ones are dirt cheap like $200) a 84mm piston set and a rebore to 84mm...hey, might as well pick up a few CC's of displacement while you are in there, right? How bad is your cylinder head dome?

Aaron
Click to expand...

It was strange cause I never had a problem with it hard starting or batteries going down. It seemed like a great running ski. Normally you can hear a knock when your lower rod bearing starts to go, never heard anything. I agree, when the bearing come apart it sucked up to my top end. Something to consider too is my flame arrester popped off as I was riding but my hull had very little water in it. Most of the time if you get water intrusion the motor wont turn over, mine just died and then hard to turn over due to the metal on my piston. My plugs were dry as can be so I dont think I had water in the motor.

Thanks for the tips, I figure I'll just build it as I go over winter. May check into porting, head, and a pipe. One dome on my head looks like the piston in the pic so its probably trash. May check into a sbt crank.
 
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