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December 16, 2017, 08:23:15 PM
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 1   oldski-doosleds Message Board / Vintage ski-doo General Disscusion / Re:Polar Fire Fitment  on: December 15, 2017, 08:39:27 PM 
Started by Bones | Last post by Bones
OH NO, HELP VSDPS doo you have some 503 pistons ?? I need some 
Bones
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 2   oldski-doosleds Message Board / Help Desk (Only) / Re:72 tnt chaincase  on: December 15, 2017, 05:47:47 PM 
Started by pingu | Last post by pingu
Using a 340 chaincase on a 292 build, so sounds possible. Thanks for the details on the bearing housing being longer. As always, great advice here.
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 3   oldski-doosleds Message Board / Vintage ski-doo General Disscusion / Re:Ski Doo Bunny ???  on: December 15, 2017, 04:07:19 PM 
Started by GaWajn | Last post by GaWajn
I am pleased to inform you that Skoodi has been sold.

It originated in Shediac New-Brunswick ... and is going back to Shediac New-Brunswick! The fellow I sold it to has the means to bring this piece back to it's original glory. I look forward to seeing Skoodi in a fresh suit

The timeline for the restoration is for the project to be done sometime this coming summer.

I will try to get pictures of the completed bunny when it's done.
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 4   oldski-doosleds Message Board / Vintage ski-doo General Disscusion / Re:Polar Fire Fitment  on: December 15, 2017, 09:26:24 AM 
Started by Bones | Last post by Green and Gold
The thing I’ve always wondered about ignition swaps is achieving/ setting the correct timing.

Before replacing anything, I envision scribing the correct firing location marks on the cases based on the old ignition, measuring crank position accurately, then installing the donner ignition, scribing new marks on the mag/flywheel, (and this is where the trick seems to be) statically aligning the pick up points to be somewhat close----elongating/relocating stator plate holes as necessary.  Then, with your fingers crossed, hope the puppy starts and run;  as quick as possible grab a  timing light and hope you can align marks before you have to call Dave and get new pistons.

Is it easier than this?

BTW Bones,  if you every confirm the swap works the opposite way, i.e installing 99 stuff on a  73-75 type 396/346 let me know, I’d be happy to take the newer stuff off your hands……
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 5   oldski-doosleds Message Board / Help Desk (Only) / Re:72 tnt chaincase  on: December 14, 2017, 07:20:39 PM 
Started by pingu | Last post by Bones
Pingu....Are you trying to use a 292 case for a 340T or use a 340T case for a 292 ??
You can not use a 292 for a 340 but you can use a 340 case for a 292 
Cdem72 mentions the off set, for the welded steel cases, yes, they had a integral off-set, but the aluminum cases used a plastic spacer for the off-set for the twins, so......The twin chain case has a much longer bearing pocket ( on the lower end). If you try to use a 292 case for the twin with the off-set the pocket is too short.
When using the twin case for a single the axle bearing is in a fair depth and installing the seal is tricky as there is no backing.
I have a twin case on one of our 335 lunger racers, it works fine, the axle seal is actually fairly close to the drive sprocket on the axle 
Bones
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 6   oldski-doosleds Message Board / Help Desk (Only) / Re:72 tnt chaincase  on: December 14, 2017, 08:20:54 AM 
Started by pingu | Last post by cdem72
I think in '72 the 340 is a twin and the 292 is still a single so there will be an offset for the chaincase for allignment or bearing cup holder is slightly longer because of this.
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 7   oldski-doosleds Message Board / Help Desk (Only) / replacement for oil seal 406 3001 00  on: December 14, 2017, 08:18:51 AM 
Started by cdem72 | Last post by cdem72
Can someone tell me the dimensions of 406 3001 00 to match up another top chanicase seal for pre '71 3/4" shaft driven clutch and chaincases? Bombardier has them as obsolete and I need a couple to replace leaking ones. or replacemtn number of any aftermarket, please? Thank you.
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 8   oldski-doosleds Message Board / Vintage ski-doo General Disscusion / Re:photobucket  on: December 14, 2017, 08:13:28 AM 
Started by Joe Olympique | Last post by dando127
I have been using a site called "imgur" with good results so far.  It seems to work really well.

Dan
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 9   oldski-doosleds Message Board / Vintage ski-doo General Disscusion / Re:Polar Fire Fitment  on: December 14, 2017, 06:02:45 AM 
Started by Bones | Last post by Bones

Quote from: John B. on December 14, 2017, 02:46:39 AM   

I have a 1975 245RV motor that uses the 377 ignition, which is the same as the 503 if I'm not mistaken. It was a bolt-on application.

The 75 - 245 is the easier RV engine to convert to a different ignition as it has the bigger mag end crank stub that matches size to many other Rotax engines. The 76 up RV engines have a tiny little mag end taper that is different than other Rotax engines.

As per my original post....You could not plug and play a Polar fire on a 80`s / early 90`s 503 due to crank shaft key way location in relation to piston TDC and location of stator mounting location on the case.
The 503 / RVs / TnT F/As etc have the key way in crank at 12:00 when the mag side piston is at TDC. For the early 503 and TnT F/As the stator mount bolts are at about 12:30 and 06:30.

The ~ 90s up 503 engines have the crank key way at 03:00 when the mag piston is at TDC. (the ~90 to 94 503 crank mag end has a long taper and a polar fire hub will not fit). I believe the ~95 up 503 cranks are the only ones a Polar Fire hub from a TnT F/A will fit.
You use a 95 up 503 crank, a hub from a TnT F/A and the case from a 95 up 503. The stator mount positions on the 95 up case is about 03:30 and 09:30,(everything is rotated 90 degrees), any Polar Fire stator and I believe it would work 
I may never do this conversion ?? Just found it interesting that these engines were made that you could not plug and play the above components, then after 15 years the engines were made such that the old equipment all lined up again.
Bones
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 10   oldski-doosleds Message Board / Vintage ski-doo General Disscusion / Re:Polar Fire Fitment  on: December 14, 2017, 05:39:54 AM 
Started by Bones | Last post by Bones

Quote from: VSDPS on December 13, 2017, 05:09:40 PM   

I'll keep an eye out for 503 pistons, just in case, LOL.

You think I might need some doo you Dave 
Bones
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