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  1. Grizzly Tech Tips
    So had a valve issue that cause an overheat issue. Stuck the camera in the cylinder, scored to beat hell. Has anyone bought this kit and installed? Price seems right if its all I need. Was either thus or go to the 686BBK and its considerably more for the 03. The kit for the 04-07 is a lot...
  2. Grizzly Tech Tips
    Hello all! Newbie here, I’m starting a rebuild here soon and I would love the feedback and advice. I haven’t dove this deep into a motor in a good bit. So back track a couple years I bought this lovely machine for $900 not running. Got it running a couple times, not more than a couple minutes...
  3. Official Clutch Forum
    I just finished putting a 686 bbk in my 2006 660 grizzly, also have installed a set of 27" mudzillas, I am lost with what I should do for clutching.. shim mod or clutch kit, secondary spring, any help is greatly appreciated.. also any suggestions on a jet kit for the carb?
  4. Bbk

    Grizzly Tech Tips
    Hey there i have a 2008 grizzly 700 EFI and i am looking to possibly install a bbk 727. Has any one don this to there EFI model yet? or has anyone installed a 10:1:1 piston and a stage 1 cam? If yes can i get some feed back? i am trying to figure out what would be my best bang for my buck as i...
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  5. Grizzly Engine & Transmission
    im getting ready to order parts to rebuild my 660. i do mostly trail riding and its usually aggressive and fast riding. im planing on a 686 bbk. can i run pump gas and 11:1 comp? Im thinking it should be ok with a cam in it. also what cam would be better, raptor hotcams stage 1 or 2? i...
  6. Grizzly Dyno/Tuning
    I found a deal on a Muzzy exhaust and I was wondering if it would be worth replacing my HMF penland slip on for? My grizz is now 734cc with a high comp piston and Stage 2 cam... what do you think?
  7. ATVs For Sale
    2006 Polaris Sportsman 500 EFI HO -- 2005 GRIZZLY 686 BBK CAMO Feel free to call me or pm me. my listing : 2006 Polaris Sportsman 500 EFI HO -- 2005 GRIZZLY 686 BBK CAMO 2006 Polaris sportsman 500 ho efi and 2005 Yamaha grizzly 686 BBK Located in Sarasota, fl. 2006 Polaris Sportsman 500 EFI...
  8. 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...
  9. Grizzly Engine & Transmission
    I have ordered a 686 kit, raptor cam, jet kit, odyssey battery and a new air filter. Soon as i get all the parts in i will start building the bike. I am going to do my best to take pics of it all and post it up once i am done.. I am also going to do a DIY snorkel kit. I hope to be working on...
  10. Grizzly Engine & Transmission
    Okay guys I know a few of you have installed BBK's on your 660 and 700s. I have been talking to Mickey from Four Stroke Tech in PA about his 488 kit for the 450 and I was wondering your thoughts on the investment vs the gains. The 450 is only a 421cc engine and he said the overall gains are...
  11. Grizzly Engine & Transmission
    :banghead:I just got my engine back together after the 675 bbk install. It runs great I had it idleing for 10 min and then started to rev it up when I noticed oil on the ground. It seems like it is coming from where the block and the jug meet. I have a new gasket some sealant and the o-ring in...
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