Can't sustain RPM's over 10K on long pulls??

[journeyman]

I guess I forgot to ask, how many miles are on this machine?

 

[Firecat_Freak]

So I took her out for a quick spin tonight. The rpm's are much higher than before. Not sure about the top speed, i'll have to wait until saturday to run it during the day. I was watching the tach on some straights that I knew went for awhile, and it would start at 10,500, and then go up to 11,000. I'm sure it has something to do with the white secondary spring as it looks like that i supposed to be for an apex mountain. The slider shoes look a bit flat on the secondary as well. Should they be flat, or rounded where they slide on the helix?

Machine has a little over 7,000miles now.

 

[Firecat_Freak]

Is running this machine up to 11k rpm ok, or not? Should I purchase the stock spring: 90508-60012-00 (pink)?

 

[theCATman]

IDK what the rev limiter is set for, but I'm pretty positive 10,400- 10,600 is where it's out of breath.

Revving over that prolly won't hurt the engine, but you're losing power at that point.

Assuming my tach is correct, mine hits & holds 10,200 (where there is room to hold it WFO)

 

[Firecat_Freak]

I'm picking up a new "pink" secondary spring today. Forgot to mention, I was seeing engagement about 3,500. It was previously at 4k. I like the lower engagement.

 

[Firecat_Freak]

So I have installed a new secondary spring, and set it to 3 and 3. I took the sled for a small trip this weekend, and was able to open up the sled on some very long straights on the trail. The trails were a little loose, but i was seeing the tach at 10,500, and then would creep up to 10,800 or so. The best mph i was seeing was 96 on gps. So, not sure what the conditions where doing for me, but i'm wondering if i need to make a spring adjustment on the secondary.

I do know that this sled has the Ulmer airbox mod, so maybe it's making a bit more power. Not sure. Should I make an adjustment to the secondary spring?