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  1. Grizzly Engine & Transmission
    I'm doing a top end rebuild on a 02 Yamaha grizzly but not sure if i have to replace the piston rod as well due to wear. It feels smooth but is obviously scratched and pitted. I'm hoping a new crank is not necessary and appreciate any knowledgeable opinions. I don't know the history of the...
  2. Grizzly Engine & Transmission
    I recently bought a hot rods 700 bottom end to rebuild my grizzly 550 and was gonna put a 10.25 compression piston in it. Turns out the bottom end kit I bought is a 5mm stroker crank, do y'all think I'll have any issues with clearance between the valves and the piston with a stage 1 hot cams...
  3. Grizzly Engine & Transmission
    I have a 2009 Grizzly 450 I currently have a JBS Sheave, cam plate, greaseless weights, modded stock exhaust, jetted, and modded stock air box. I was looking into getting a hc 11:1 piston and a webcams cam. What kind of performance and reliability should I expect? What does the cam and piston...
  4. Grizzly Engine & Transmission
    I just put in a new je 11.1 piston because I had my timming jump bend one valve and wreck the piston. Had the cylinder worked by a local machine shop, put in the new valve and piston and wrings got it running, and it is smoking like crazy. Also is pushing oil out of the crankcase vent into the...
  5. Grizzly Engine & Transmission
    Im rebuilding my 660 topend going to go with an 11.1 piston standard bore. What pistons have you guys all used and had good luck with. Almost all the engine builders recomend the cp and if they recomend anything else they say to use a je. Just want to hear what everybody on hear has had good...
  6. Grizzly Engine & Transmission
    OK so i have tried all of the tricks to cure my 660's smoking habit. sea foam, marvel mystery oil, lucas oil treatment. and it still smokes. i have decided (with members advice) that at a minimum i will need to replace the rings and valve guides. if it turns out that i need to rebore and...
  7. General Discussion
    im going to purchase a high comp piston wiseco 11:1 what octane gas must i run with it and also what is the highest compression piston you can run with 93 octane? thanks guys
  8. Grizzly Engine & Transmission
    just got done installing a hc wiseco piston and it seems to work reallly good. i was thinking of doing exhaust and possibly cam now. how much improvement would i feel by doing those mods?
  9. Industry News
    The AMA Championship winning Monster Energy/Pro Circuit/Kawasaki Race Team has tested and approved the Pro Circuit High Compression Piston Kit. This custom-built performance package is designed and engineered by Pro Circuit and built by JE Pistons, the leader in high performance forged pistons...
  10. General Discussion
    Well the ups man came early today!!! :angel: He came at 11:10 instead of 12:45 :) Well here is a video of whaat you will find in the box that comes to your door. Enjoy :). Wiseco Manufactures High Performance Forged Pistons & Performance Parts for Motorcycles, ATVs, Snowmobiles, Marine, and...
  11. Industry News
    Continuing with the success of the line, the new 2012 Pro Circuit KX450F Piston Kit Read More at
  12. Grizzly Talk
    I'm rebuilding my engine what is the best piston kit available for my 400 grizzly?
  13. Industry News
    CORONA, CA - July 27, 2011 -* The new Pro Circuit KTM250SXF Piston Kit is Read More at
  14. Grizzly Engine & Transmission
    So I have been wanting to do the 488 BBK kit on the 450 for almost a year now. I recently started smoking on start up and figured while I was taking care of why (rings, valve seals etc.) that it would be a good time to just rebuild the top end. Chances are the 450 will be making a trip for the...
  15. General Discussion
    Hey guys i was wondering i see on Yamahas site the copmression ratio for different quads what exactly is compresstion ratio? I know what compression is just not the ratio. Also when you see on ebay a piston is like 42mm what does that mean? and how do you tell the brand of the piston? I know...
  16. Grizzly Engine & Transmission
    wondering what 11:1 wiseco piston upgrade would do for better throttle response, do not know what the stock pistons' ratio is. I found a place that upgrades the cam as well , has anyone gone this route with thier 450?
  17. Grizzly Talk
    i was told i need a .10 over piston cant seem to find one so i guess this cant be right ?
  18. Grizzly Engine & Transmission
    So I am in the process of splitting the case of my Grizzly 450 because the transmission has no reverese / no neutral. So I pulled the cylinder head, cylinder and then removed the piston from the connecting rod. Well I accidently knocked the piston off my bench when reaching for the phone... ( I...
  19. Apparel
    Smith Optics Piston Goggle Tested and written by Gary MSRP $75.00 One of the most important safety items we use when riding our ATVs is eye protection. A good pair of safety glasses may provide some protection from bugs etc on a leisurely ride on blacktop or through a freshly mowed field, but...
1-20 of 20 Results