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FYI, BOP makes a nice setup that works great on the 129.

I think it looks great! I hope it is a huge success for Cat.

Maybe try a different wrap on the secondary? I don’t recall what wrap I had it at, but I lost 5-6 mph on top with the B/O compared to my stock secondary spring at 3-3.

You are topping out at 24/50 speeds.

You are limited by the BOV. At 16.8, it should still run out of gear. I’m surprised the stock BOV holds that high.

21/41 should get you 124ish on the speedo.

Are you still running the stock BOV?

Thanks. What kind of RPM drop would you estimate if I replaced the 4.5 with a 5.9?

What is the process? Remove the weights, drill out the stock rivets, and install heavier rivets with a rivet gun?

Yes you can. I have for 4,000 miles with an XS825 belt. I can’t predict what it will rev with the 8JP.

Perhaps the 240ss tune is faster than max spool 16? I know TD uses a higher base HP for their calculations compared to Hurricane.

My dad has 4,000 miles on his. He absolutely loves it compared to the 137 LTX it replaced.

How is closed loop working out for you guys? Was the juice worth the squeeze ?

No problem with an XS belt. Yes to different weights with a Yamaha belt.

Because the Dalton’s likely perform better. I’m sure I’m leaving some performance on the table by using stock weights. I’d love to try a set of Dalton’s to see the difference. The problem is, I’m cheap. And, right now I have good roller and belt life. I’m afraid I’ll give up roller life with...

I have never had that problem with mine.

I run the 2 bar version of this tune with a BOV on my 2018. Yamaha Blu/Brn/Blu primary spring, stock weights, stock 35 helix, and stock secondary spring. Mine runs 9,100rpm. It is easy on belts and easy on rollers.

IMO, here is the secret to success with these sleds. -address the driveshaft early on -change the top gear bushing once a season or install a DMC top-gear. -weld the chain roller bolts or use red loctite. -address clutch alignment. Some mill them, some remove the washer behind the secondary...

I have a stock muffler tune and my dad has a stock winder. They are very similar in fuel consumption. I am harder on the throttle than he is so I usually take a bit more, but it isn’t much.

I have 2 bar MS16 and it runs high 16’s on the hour meter, with an occasional spike to 17.2.