1997 ski doo formula 3 600 triple tinging noise - Snowmobile Forum: Your #1 Snowmobile Forum
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post #1 of 10 (permalink) Old 10-11-2010, 04:20 PM Thread Starter
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1997 ski doo formula 3 600 triple tinging noise

I have a 1997 ski doo formula 3 600 and sometimes when it idols I can hear an ocational noise like a ting and it sometimes stalls. I turn the primary clutch and can hear only the weights in the clutch. I turn it slow and it feels smooth. Could it be I have old low octane fuel? Any help would be greatly apprieciated.
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post #2 of 10 (permalink) Old 10-11-2010, 04:42 PM
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Idle rpm is?

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post #3 of 10 (permalink) Old 10-11-2010, 11:00 PM
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The bearings on the PTO end of the crankshaft are more than likely causing the noise. The phenolic plastic ball separators have probably disentegrated and all the balls are running loose between the inner and outer races. They occasionally all run together and act like a sprague clutch which locks up the bearing causing the engine to stall. I have seen this many times on SkiDoo triples. The fix is a crank rebuild. And check to be sure there is an oiling hole drilled for the pto bearings. It will be obvious if it's there or not when you remove the pto cylinder. Many were not drilled in 1997.
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post #4 of 10 (permalink) Old 10-12-2010, 08:51 AM Thread Starter
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I think the idol rpm is about 1500 but since I never made a note of it that is a guess, I could start it up and warm it up to check the idol since sometimes it doesn't make the noise. What should it be and what does rpm have to do with the noise?
Is there a visual check to see if the bearing is bad or some other way to check for sure?
The guy I got the sled from said the engine was rebuilt but I guess he could have lied to me.
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post #5 of 10 (permalink) Old 10-12-2010, 01:55 PM Thread Starter
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Would the occational backfire make that sound? I had the exhaust off and it back fired from the middle exhaust once for the 5 to 10 seconds I had it running. Could a backfire or multiple backfires kill the engine? What would cause an intermittent backfire?
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post #6 of 10 (permalink) Old 10-13-2010, 01:01 AM
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Pull the clutch and roll the engine over and listen for bearings clacking. That's what I got told to do on my Mach.

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post #7 of 10 (permalink) Old 10-16-2010, 02:02 AM
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If the crank bearings are gone you should be able to feel the play when you pull the clutch up and down. There should be no play.
The noise could also be pinging. When the engine is running lean or the wrong sparkplug is used the gas can pre-ignight in the cylinder. The piston skirt hits the cylinder wall which makes the ping noise.

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post #8 of 10 (permalink) Old 10-18-2010, 04:54 PM Thread Starter
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I sucked out most of the old gas and put in a few litres of 91 octane. I gapped new spark plugs to .018". I checked the compression when the plugs were out and I got 100, 100, and 105 psi. When I was turning over the engine I couldn't feel or hear any noise from the engine. I started it up and it backfired once then ran great with an idle of 1700 rpm.

Question; since the compression is on the low side can I use regular octane gas or should I still use premium?

I will have to assume the noise I heard was pinging due to pre ignition.

I didn't like how I had to bend the ground electrode on the spark plug to get the proper gap. It just looked wrong.
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post #9 of 10 (permalink) Old 10-18-2010, 11:00 PM
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You can use regular gas.
Spark plug gap on the newer CDI igtions are usually around 0.025" - 0.030"

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post #10 of 10 (permalink) Old 10-19-2010, 12:04 AM
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If your pinging was due to preignition you don't want to drop octane in your gas. My 98 Mach manual calls for high octane fuel so that's what is run in it. What quality comp tester did you use? It might be worthwhile to borrow another one and compare numbers. The reason the plugs are gapped so tight is your stator is the same as a twin stator and you are running 3 coils not 2 so spark is not as hot. Donnie over at Dootalk has hi performance coils that let you open the gap up. You can build your own with Evinrude coils but it worked out for me to be a better deal just to buys his than build my own. You can do a search over there in the Mach 1/Z tripples section for info on both.
Mike

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