supercharged111
Member
How many/how big of holes did you drill? I'm getting the itch to do this but need to grab some main jets first.
supercharged111
Member
If you get a taste of 9000 you're never going to want to go back to a single pipe.
Go to TY Home tech pages and Snowmobile tech then Engine
All the instructions are there.
For the last couple decades the only place I get my Secondary Helixs is from Dalton....top quality and consistent angles.
supercharged111
Member
And there it is, I thought it was a bunch of 1" holes. Time to order jets. I ended up weighing the hardware store rivets on a more accurate scale today and here's what I've found:
aluminum rivet with aluminum washer 1.0g
Steel rivet 2.0g
Steel washer 1.3g
So last night I added 2.3g to the inner hole. Slapped it on, went for a rip, sled was right about 8700-8800. You'd think that's perfect but it wasn't very snappy, so off came the 47 degree helix and red spring at 70 degrees, on went the 45 degree helix with green spring wound up to 70, and it's a bit snappier but touching over 9000 again. I'm thinking the reason it felt off at first is because it was taking longer to get on the pipe with the lazier backshift having to slog through the bit where it doesn't want to be but it still hit triple digits at 8700-8800 so there's plenty of chooch there once it's wound up. I'm thinking I'll shoot for 8900 or so since it's cold out, I'll probably lose a little when it warms back up and the trails get sloppy. Plus should help it get on the pipe sooner. Off came the primary again and I swapped the outer 1.0g aluminum rivets with washers for steel rivets without washers, so I now have 3.3g in the inner hole and 2.0g in the outer hole. If 2.0 isn't quite enough I can combine an aluminum rivet with a steel washer to hit a touch over 2g. I'll see what that does tomorrow when the kids are in school. I'm currently waiting on 2.44g, 2.7g, 3.1g, and 3.6g Yamaha rivets to arrive in the mail.
aluminum rivet with aluminum washer 1.0g
Steel rivet 2.0g
Steel washer 1.3g
So last night I added 2.3g to the inner hole. Slapped it on, went for a rip, sled was right about 8700-8800. You'd think that's perfect but it wasn't very snappy, so off came the 47 degree helix and red spring at 70 degrees, on went the 45 degree helix with green spring wound up to 70, and it's a bit snappier but touching over 9000 again. I'm thinking the reason it felt off at first is because it was taking longer to get on the pipe with the lazier backshift having to slog through the bit where it doesn't want to be but it still hit triple digits at 8700-8800 so there's plenty of chooch there once it's wound up. I'm thinking I'll shoot for 8900 or so since it's cold out, I'll probably lose a little when it warms back up and the trails get sloppy. Plus should help it get on the pipe sooner. Off came the primary again and I swapped the outer 1.0g aluminum rivets with washers for steel rivets without washers, so I now have 3.3g in the inner hole and 2.0g in the outer hole. If 2.0 isn't quite enough I can combine an aluminum rivet with a steel washer to hit a touch over 2g. I'll see what that does tomorrow when the kids are in school. I'm currently waiting on 2.44g, 2.7g, 3.1g, and 3.6g Yamaha rivets to arrive in the mail.
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