98 600 EFI Powder Special Boggin and Backfiring - Snowmobile Forum: Your #1 Snowmobile Forum
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Old 12-30-2009, 09:49 PM   #1 (permalink)
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98 600 EFI Powder Special Boggin and Backfiring

Hi Everyone, I hope maybe some of you have seen this problem and have some suggestions. First a bit about the sled... bone stock, motor has about 800 miles on it, new clutch last ride ... last winter. At just above an idle util about 30-35 mph ( rpm's don't seem to matter ) the sled will bogg and backfire or just flat quit for a second or so throwing you onto the windshield. Last winter everyone was convinced it was the clutch so I saved up and bought a new one and put a new belt. Everything seemed good, but it was one of those WOT days. Now they have it up in McCall and can't even ride it on the trail. I'm not sure if its a fuel issue or maybe coil.... anyone had this problem?

Thanks!

TecCrash

'98 Powder Special 600 EFI
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Old 12-31-2009, 04:07 AM   #2 (permalink)
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It could be as simple as a kill switch being intermitant, Or fuel presure regulator to high (will run at WOT!)
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Old 01-04-2010, 03:01 AM   #3 (permalink)
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I'm pretty sure I'm good on the kill switch, but I plan on figuring out how to check the fuel pressures and the regulator when I get back home. Any idea where I can get the specs on pressures and the dead headed pressure for the regulator?

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TecCrash
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Old 01-04-2010, 03:02 AM   #4 (permalink)
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Also I would think that there is at least one fuel filter in the system, but my Cat dealer can't find it and neither can I on any of the micro fiche sites I have. Any ideas?

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TecCrash
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Old 01-04-2010, 03:50 AM   #5 (permalink)
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Fuel pressure should be 36.2psi,+/- of 5%.
The filters are included as part of parts # 27-28, Fuel pickup, front/rear.
There are no inline fuel filters.
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Old 01-04-2010, 05:57 AM   #6 (permalink)
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Quote:
Originally Posted by TecCrash View Post
Hi Everyone, I hope maybe some of you have seen this problem and have some suggestions. First a bit about the sled... bone stock, motor has about 800 miles on it, new clutch last ride ... last winter. At just above an idle util about 30-35 mph ( rpm's don't seem to matter ) the sled will bogg and backfire or just flat quit for a second or so throwing you onto the windshield. Last winter everyone was convinced it was the clutch so I saved up and bought a new one and put a new belt. Everything seemed good, but it was one of those WOT days. Now they have it up in McCall and can't even ride it on the trail. I'm not sure if its a fuel issue or maybe coil.... anyone had this problem?

Thanks!

TecCrash

'98 Powder Special 600 EFI
When a sled is bogging/cutting out and back firing it is not clutch related. You either have a fuel issue or more than likely a spark issue. Watch my "Diagnosing..." and my "Testing a stator.." video in my signature. It "sounds" like a bad TSS/kill switch, maybe a bad/dirty ground, possible shorted wires somewhere or your stator is starting to puke out. Your stator testing specs are 45 ohms and 450 ohms. Could be bad reeds, sheered timing key, compression issue..ect...but not clutch related.
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