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post #1 of 11 (permalink) Old 07-28-2011, 07:22 PM Thread Starter
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660 rhino upgrade.

Hey guys i have a 05 660.. sheave, spring, brb cdi, and electric fuel pump.. I have 16g weights ordered for it.. and i am thinking about doing a 686 cylinder.. any thought on how much i am going to gain with adding the big bore to my machine? I do not want to change the exhaust just yet.. I live in the northeast and like to be quite sometimes.. But am looking for more power for the hill climbs..


Whats your thoughts Guys?
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post #2 of 11 (permalink) Old 08-05-2011, 08:05 PM Thread Starter
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anybody? has anyone done the 686cc kit yet? i know there are guys that have out there..
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post #3 of 11 (permalink) Old 11-10-2011, 06:48 PM
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I have an '07 660. I went with a Wiseco 102 mm. (686 cc), hot cam, and turbo. Nothing but problems trying to dial it in. Had only a few hours on it and the piston came apart. Bent valves, ruined cylinder, head, etc. I would not blame any of this on it being a 686. I went back completely stock but would have gone back with the 102 mm if I hadn't of already dumped so much money in it. I think that would be a very dependable set up. Go for it. If I was going to do it again, I would probably go with a JE piston instead of the Wiseco. I would also keep the compression close to stock specs. I am sure there will be guys on here that will tell you to go with more compression and larger cam. After going through two pistons, I am sticking with stock for the dependability.
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post #4 of 11 (permalink) Old 11-10-2011, 06:54 PM Thread Starter
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since this post i have sanded down the stock cylinder and burnt the rod...

currently my engine is apart waiting on a crank


But this is what i have to go back together

686 cp piston.. with 11.1
hot rod hd stock stroke crank
arp head studs
mud buster cam
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post #5 of 11 (permalink) Old 11-10-2011, 07:44 PM
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Should make you a good dependable set up. I should have posted earlier. I have a 102 mm that is a 11:1 Wiseco piston and a Hot Cam Mud Buster I plan on selling. I also have a lower case for an '01 Raptor with a good crank but bad 2nd gear. Good luck with it.
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post #6 of 11 (permalink) Old 11-14-2011, 02:22 PM
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Need 660 or 686

Charger do still have the 102mm motor for sale if so call me 661 33456085 thanks Chris
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post #7 of 11 (permalink) Old 11-14-2011, 04:44 PM
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no one does a more reliable or powerful 686 than Chris at benchmark performance, period.

Hot rod cranks just plain suck, so do wisecos pistons in a RHINO motor, great 2 stroke pistons, but not in a rhino, JE are heavier than CP, oil porting on the CP and casting is far superior. and get the Piston pin upgrade DLC coated.

for big cams, you cannot use the stock valve stem seals, they will get crushed.

stock carb is a tuning nightmare on a 686 as well, they just will not perform very well. at a minumum, get a FCR41 or Mik 45, FCR preferred here.

Benchmark has his own cam grinds as well for many different builds

760-484-0986 For Chris

34 pulls on the dyno at 9000 rpms and I got 67rwhp out of my 686.



Benchmark Performance 686, 67.6 RWHP
http://www.unleashedutv.com/ 602-246-4011
Rigid Industries 480.655.0100
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post #8 of 11 (permalink) Old 11-14-2011, 04:46 PM
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Crispy67. I didn't do a very good job of describing the parts I have. I have a new 102 mm Wisco 11:1 piston and a Hot Cam that I think they call a Mud Buster. The piston is new but the cam has maybe 100 miles or less on it. Just never got it to run right with the turbo.They are over at the shop where I have the bike or I would give you the numbers off of them. The case and crank I have is from a '01 Raptor that had the second gear give it up. I bought the Raptor with the engine in a basket and used the cylinder, etc. off of the top end but did not go into the bottom end. I do not know how much damage the gears inside or if it did anything to it. I don't think the crank was hurt but that is just a guess because I don't know how much it was run after the gear box went south. I don't even know how I would go about shipping it even if someone wanted to buy it. Probably would be better off if someone locally wanted to come a take a look at it and see if they would have a use for it. I might need to split the case and pull the crank out and check it before I tried to sell it to someone. I hate buying used parts and feel others think the same way in lots of cases. I learned that from buying the turbo used. Was promised it was perfect but when I received it by freight, it needed to be overhauled. I used the cam out of it in my '07 660 rhino but it looks identical to the stock one. We measured it as best we could and even called Yamaha's tech dept. and asked for the specs. on it but they would not give them to me. I have gone back stock except for the Raptor cam and can't get it to run right and that has me thinking maybe the Raptor cam was not a good idea even though the books say it is interchangeable. Sorry for the long post and for misleading you in my post. As bad as my luck has been with this project, I may just need to keep all the parts just in case...
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post #9 of 11 (permalink) Old 11-15-2011, 02:16 PM
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I know you like the quiet but to get the power out of it you have to let the engine breath, i put a set of muzzys on my 686 and it made a world of difference in it, with stock exhaust it will not let you get the rpm you need to much back presure. I have a 2011 700 with uni air filter,msd ing/fc,hunterworks machined primary shive,16 gram rollers,greasless fixed plate sliders,hunterworks cam,26" big horns,and muzzy exhaust,and it runs real good. hunterworks machined shive greaseless rollers and sliders gives you good power from low end to top end,it will make a big difference in your rhino
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post #10 of 11 (permalink) Old 03-29-2012, 04:16 PM
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Quote:
Originally Posted by Sneaky snake View Post
I know you like the quiet but to get the power out of it you have to let the engine breath, i put a set of muzzys on my 686 and it made a world of difference in it, with stock exhaust it will not let you get the rpm you need to much back presure. I have a 2011 700 with uni air filter,msd ing/fc,hunterworks machined primary shive,16 gram rollers,greasless fixed plate sliders,hunterworks cam,26" big horns,and muzzy exhaust,and it runs real good. hunterworks machined shive greaseless rollers and sliders gives you good power from low end to top end,it will make a big difference in your rhino
Hey i am new at this i need to no wich CDI box is the best for my 07 rhino
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