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  1. Doc Harley

    Switchable Muffler

    Guy on Facebook made a prototype of something we had years ago. I can't completely wrap my arms around the fact that this wouldn't be marketable, especially for Canadians and US states that the DNR Flags you for being too loud.
  2. Doc Harley

    Valve cover question

    When you are removing cover, for whatever work you're doing. Are you replacing the cover gasket? If you decide to use the old gasket are you reapplying yamabond to cover side when reinstalling?
  3. Doc Harley

    Track question

    9224H - 137" x 14" wide x 1" 2.86 ripzaw II 9010H - 14" Wide Hacksaw 136 x 14 x 1, 2.52" pitch, Two ply, Full clip, This is a 15" wide track we narrow. Assuming the 136" will work with 10t 2.52 drivers, what's going to be the difference? Does one have a sizable advantage over the other? if so...
  4. Doc Harley

    Looking for....

    Any guys/shops in or around North Central Illinois or south central Wis. Capable of doing head studs on a 998t, please LMK. Ty....
  5. Doc Harley

    Primary spring Question

    My primary is trying to tell me something. While I have no streaks of belt slippage, I am seeing the primary turn gray with belt dust and belt temps are manageable, but could always be cooler. I'm assuming I need just a slight touch of additional pressure on belt, throughout the RPM. The ultimax...
  6. Doc Harley

    Suspension tips

    I found myself needing to suck my limiter straps in all the way. The positive effect is a more manageable sled during acceleration. The negative side effect is I'm not strong enough to wrestle it in the trails. Power steering is on my very short list to correct this. Is there anything I can do...
  7. Doc Harley

    TD header, tune & afpr question

    I did a search and didn't see anything. Are there drivability issues that I could have possibly overlooked or don't quite understand in regards to adding a TD header/tune and making adjustments with a TD afpr? TY
  8. Doc Harley

    Hurricane turbo intake upgrade

    Hurricane claims 10hp+ increase. Anyone try it out?
  9. Doc Harley

    Secondary question

    Had my secondary cut down a couple years ago. Then read a discussion about, cutting too much off. I have a guestimate of .020 of gap between washer & sec movable during full shift out. Will this be enough room given thermal expansion?
  10. Doc Harley

    Preseason inspection

    Found this during my routine Inspection. Common problem? Anyone have a fix or just replace? Ty... Inter seal still intact but just one wot pull from a bad day.
  11. Doc Harley

    The Motor oil geek

    Any of you guys ever follow this guy? I believe him to have the most knowledgeable YouTube videos on oil and how it works. He's not a fan of Oil marketing, such as mobile one & claims of a particular oil being the best. Actually most current oil specifications are not the best. They do this for...
  12. Doc Harley

    Blow by

    I've spent some time researching "blow by". And found this to be 100% true in automotive applications. Anything with forced induction is going to experience blow by. The more boost, the more prevalent it becomes. The PVC system on most cars, due to EPA regulations, require the regurgitated air...
  13. Doc Harley

    Boggie question

    Are these four parallel running bogies necessary? Can I remove the forward set? In what way would they affect my sled? Ty....
  14. Doc Harley

    Greasing needle Q?

    Is there a way to repair these or does someone make a one-piece needle? Got these from Amazon and they don't last very long.
  15. Doc Harley

    You need to see this!!!

    First video is factory snub shaft (warm) with knockout kit Please hold your comments while I upload videos, thank you!
  16. Doc Harley

    G-Force Belt question

    Switched over to G-Force, before the second break-in cycle the belt started squealing on take off. Fix deflection, keep riding. After second heat cycle it let out a short squeal while throttling in reverse. Did it one other time. Curious as what that might be? Never did it B4, and I used reverse...
  17. Doc Harley

    40-R4313

    Have two gates belts. Metallic fragments woven into the surface and very pronounced on one belt. Yes, brand new and right out of the sleeve. Terry @ Thunder claims he can't remember seeing anything like it. (His initial reactions) Just a word of caution moving forward, until confirmation can be...
  18. Doc Harley

    She laid over....

    Got out this morning to do 1,000ft runs. After two power trail passes I switched it up to ms-17 made another pass, no problems RPMs 9050. Never looked at Boost. I switched out helixes and lined up again. Halfway through the pull she laid down, and never got back up. She was able to glide in to...
  19. Doc Harley

    Boostane

    So I got this bottle of Boostane I opened two years ago. I understand it degrades over time. Can it still be used to increase octane to some unspecific level. Basically, does it still do something?
  20. Doc Harley

    Useless trivia for 2points

    Does anyone realize that our reverse actuator came from a 90s import, it's a window motor. It is literally a direct replacement. Does anyone know the model & year of the car?


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