ANOTHER OLD OLYMPIQUE 300 TWIN RATSLED UP AND RUNNING again!

[sledrat]

SLED INFO
YEAR:1974
MODEL:SKIDOO OLYMPIQUE
MOTOR:305 ROTAX F/C
CYLINDERS:2
SKID TYPE:Bogies



A while Back i pickup this nice old Olympique 300 Twin skidoo the previous owner
was a very cool cat and gave me a very good deal on it along with another old sled he basically wanted out of his yard!..
I also repaired a sled hood for the owner that he needed repaired along with cash for the pair sleds..
Anyways this Jem in the rough of a sled needed to be cleaned up and tuneup abit like every other old ratsleds
i seem to get..
And thats how i get them and thats how i like em..
No complaints here!


Soanyways i cleaned the carb and tank i noticed the fuel pump and carb was broken
THe carb had one brass fuel nipple was pulled out of right out the carb and was still stuck in the end of fuel line!
Which was'nt to big of deal. I simply expanded the the return line brass nipple with a tapered small punch..
And i then tapped it half way back into the carb lightly,
But before driving it back in its original port in the carb
i added a small amount of Super loctite on the base to give it alil more holding power however the amount i expanded it was probly more than enough already,,
IT was a supertight fit air tight.
Even with plyers i would have hard time pulling it out again ok CARB FIXED!.

After looking at the original odd looking fuel pump that i never seen that type before the bottom plate was broken off it was plastic!.no way to fix it without a new bottom inlet plate.
SO i decided to try and use a spare elan mikuni fuel pump i had in the my old sledshed instead,,
With fingers crossed i hoped it would have the power and fuel flow it would need to the carb?? I pondered this for a while ..Then remember seeing a Tundra skidoo using the same one which was bigger than 250cc.. So what the hay it was worth a shot..

 So after running a few new fuel lines and plugging off the primer lines and primer connections cause the primer was dryed up and no good of course....

I then primed the carb with fuel direct in the carb and started it..
Yep it started and ran but not good it would barely idle
but it would run not bad alil over 1/4 or half throttle..
So i changed plugs no difference it felt like it was really only running on one cylinder most time.,
SO it had to be the points i figured..
But in order to clean and file em properly the motor has to come out or the flywheel has to come off at least!
So i tore into it and pulled the motor.
When Looking at the flywheel i noticed a bit of oil when i took off the starter cup!
Just great i thought ok gonna need new crank seals too.

Ok

When trying to pull the flywheel that kinda stumped me for abit
i did'nt have the proper puller i thought,,

I do have  flywheel pullers for everthing but the twin cylinder rotaxs motors
which on my part is not very brite. Not to have one considering,.,,


Anyways Heres how i did it,, The answer was right in front of me..

[sledrat]

PART TWO THREE MONTHS LATER

TO COLD OUT TO WORk on IT untill two days of grace
the weather finaly warmed up enough to work on it outside!.....

After pulling the flywheel and fileing the points flat and clean
i decided to pull the crank case apart..To put the new seals in,,,
I went alil futher and i pulled the carb and manifold off so i could pop off
one cylinder to inspect the mag side piston and cylinder,,
TO MY SURPRISE i FOUND THE REASON WHY IT WAS NOT RUNNING OR IDLEING WELL

THE TWO SMALL BLACK SQUARE GASKETS WHICH SEAL each side of MANIFOLD TO THE CYLINDERs
YEP ONE SIDE WAS NOT SEALING PROPER ! IT was not installed proper..

So untill the engine was creating a higher vacuum which is at higher RPMS
only one cylinder was getting proper fuel!

So i made two newintake manifold gaskets out of some
heavy autmotive gasket paper i had laying around to replace the old rotten black rubber ones.,,

pulled the cylinder on the mag side I DID NOT PRY THE HEAD APART...
sO THE HEADGASKET WAS NOT SPLIT FROM THE HEAD..sO I COULD SIMPLY RETORQUE IT BACK DOWN AGAIN..

I noticed the Piston and rings HAD LOTS OF CARBON ON THEM ,,
SO i LOOKED AROUND FOR the stuff i like to use on that
its called POWERTUNE its made by the mercury outboard company
its a foam type of carb cleaner..
It totally breaks down gum varnish carbon ect in no time with out being hard on the piston...
I then scraped gently most the carbon i could of the top of the piston and took off each ring
and then gave it good shots of the power tune foam,, then i let it sit for awhile and then clean off the piston and ring grooves! What huge differnce!
The rings worked like a hot dam again not sticky at all yep the rings were nice and free and clean!,, Hoping for a lil better compression any lil bit helps you know....

put the motor back together ...

AND HERES WHAT HAPPENED....

[sledrat]

Now to tune the carb alil and

TRY THIS OLD RATSLED OUT IN THE WHITE STUFF AGAIN !!!

Oh ya and i will GREASE UP THE BOGIES real good too!!!
I Cant forget that!
HA

Later Brotherz

SLEDRAT

KEEPING EM RUNNIN AND TUNED FOLKZ!

[Steely dam]

Nice old sled did take it for a rip yet?
The motor sound decent did you tune the carb yet ?

Dan

[Duckpucker]

That sled is acting like its running out of gas!
Hope you get that old Olympique up and running good again
they were great sleds..

Duckpucker

[sledrat]

HERES PART TWO!

[moosemeat]

Right on sledrat you got it running pretty decent but i notice at idle
though it sounded crispy maybe a lil lean
did you check the plug color after your test ride?


Moose