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rebuild 660 or start looking for a used engine??

This is a discussion on rebuild 660 or start looking for a used engine?? within the General Rhino Discussion forums, part of the General Rhino category; my 660 recently seized up on while crusing it, it did not throw a rod and everything on the case looks good, but when i ...


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Old 04-10-2012, 02:46 PM
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rebuild 660 or start looking for a used engine??

my 660 recently seized up on while crusing it, it did not throw a rod and everything on the case looks good, but when i go to crank it it just clicks, its frozen. I took it to a shop in phoenix and they said be prepared to spend up to 5k to rebuild it, 5k really? at that cost i'd rather save my money and go with a rotax or sr1 kit, i saw a weller 686 on craigs for 3k, i find it pretty hard to believe that a rebuild can cost that much, i bought the thing for 6k. should i look elsewhere to rebuild the motor, should i look for a used motor or?? any help??
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Old 04-10-2012, 03:38 PM
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....knowing why it seized is more important to figure out it its all blown up inside..........sounds fishy, they mostly go kabooom....the truth is a piston and bore is about 150 bucks,oil pump and two chains is about 100 bucks, gaskets are 125 for the set,rebuilding the crank is about 200 with a better rod....but there are tons of upgrades you can do while its apart which most people would recommend doing..
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Old 04-10-2012, 03:57 PM
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it didnt go kaboom, sounded more like a clit, clit, bang and then stopped, wouldnt even turn over after that. it was running like a dream before that, no knocks or anything. im gonna need to start taking it apart, got a repair manual and well lets hope i dont have any left over parts when i put it back together, im thinking about going with a 686 kit
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Old 04-10-2012, 04:03 PM
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First Name: cameron
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save your bore, don't bother boring it 2mm over, you aint gunna notice it, what you will notice is if you up the compression and port and cam it....but if you left it totally stock and just bore it to a 686 with the stock ratio you won't be saying oh boy its soo much faster!....save the bore and go with a ten over piston with a point more in compression then you'll notice a change...
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698cc 4mm crank 100.5 bore, Pro-flow/camshaw intake and head porting&flow bench head design and exhaust,duner cam,stock valves,welded cases,Camshaw engine tricks and mods,custom air intake system and breather kit,greaseless clutch(DOSDAYONA custom race curve)48 HSR mikuni carb, oem throttle cable mod, owner built cage and bed delete, 40" LED,alternator kit,camshaw spindles and gusseted oem rack,HD heim joint steering links,Jaz seats,5 point belts,gauges,STU blasters&whipsnakes,714-833-6171
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Old 04-11-2012, 03:28 AM
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my RHINO did the same thing. Water Pump shaft broke and overheated and the crank seized up.

I got a new crank kit for around $300 and all other parts needed for top end, etc etc. probably like $600 in parts. my buddy did it for me for a few hundred. Took a while to get it but it was worth it for me in the end. $1000 vs $2500 for another engine.

like said all depends what broke inside of the engine.
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Old 04-11-2012, 02:27 PM
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i went more into it today and i manually turned it from the cooling fan bolt on the right side of the engine and it turned freely, i went to crank it and it turned over but didnt fire, every time id stop cranking it it would seize up again, did this happen to you??
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Old 04-11-2012, 02:38 PM
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Yes, we could turn the crank with a big ratchet, it would turn and seize up right after. Repeat and it would turn again but stop as soon as it turned a bit. after a while we could not turn it over no more. Sounds like the same to me
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Old 04-11-2012, 02:46 PM
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well i just hope i get the same luck as you, beats rolling the dice on someones elses problem engine, im going to start tearing it down and hope for the best, im going to start saving and go with a rotax in the next year or so, but for now the 660 is plenty fun for me.
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Old 04-12-2012, 02:31 PM
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ok so it looks like i need a bottom end rebuild, anyone know a ball park number of what im looking to spend, i have 2k and i hope thats enough, other ways im going to have to sell as is and save up for a new machine.
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Old 04-12-2012, 03:52 PM
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if its all in good shape and just needs rebuilding you can do a good job for 2k....
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Old 04-12-2012, 06:59 PM
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If you have someone who knows what they are doing, much less than 2000 bucks.

Wiseco Complete Bottom End Rebuild Kit - Dirt Bike Motocross 2005 Yamaha Rhino 660 4x4 - Motorcycle Superstore

I got mine in canada for around $300.

I also bought separately new rings, timing chain, etc etc. whatever my mechanic said I needed as he had it torn down and was still around $1000 with that he charged me.

have about 500 miles on it now and still runnign strong. I have around 12,500 kilometers on it in all.
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Old 04-12-2012, 07:05 PM
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AZ

im boping its at least 1500, it just sucks that i dont know anyone that can help me out with it, i know shops will do a heck of a job but the prices are too high for a college student, hopefully i can find someone that will help me out, i am pulling the motor tomorrow and see whats all that i need. how is that kit running? seems to be priced right.
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Old 04-12-2012, 07:10 PM
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Multi-weight oil failure.
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Old 04-13-2012, 03:04 AM
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It's working good for me, but it might not be the same thing in your case. Gonna have to tear it down, see what it is.

If you don't have the manual, download it and print it.
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Old 04-13-2012, 06:38 AM
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You just don't know the cause yet, if it toasted the crank that might mean u need a new crank, if the water pump busted or broke u might need a new one of those, if the bolts on the middle drive backed out because they werent tacked onto the plates like I do then it could have chunked the middle drive gears,two of those........it could have cracked or split the middle drive boss or tower that mounts the middle drive to the case, I like to gusset them and weld them while its all apart-a great security blanket..........
So there are a few senarios that could have happened, but all these issues can be remedeed when you go to put it all back together.......also the crank could have twisted because the crank pin wasn't welded, also the piston could have cracked and you might have caught it right in time before it did some major damage.........
Either way if you need some help I have 7 motors and tons of parts, and i don't think you'd be happy with a rotax conversion as the cost just to get one in your car and working properly is over what your rhino is currently worth, I was looking into it and it was over 10 grand to do the conversion on the average....cameron..
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698cc 4mm crank 100.5 bore, Pro-flow/camshaw intake and head porting&flow bench head design and exhaust,duner cam,stock valves,welded cases,Camshaw engine tricks and mods,custom air intake system and breather kit,greaseless clutch(DOSDAYONA custom race curve)48 HSR mikuni carb, oem throttle cable mod, owner built cage and bed delete, 40" LED,alternator kit,camshaw spindles and gusseted oem rack,HD heim joint steering links,Jaz seats,5 point belts,gauges,STU blasters&whipsnakes,714-833-6171

Last edited by camshaw; 04-13-2012 at 06:54 AM.
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