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~~~ 660 Specialist ~~~
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Discussion Starter · #1 ·
Ok so here we go. Well in 08 I had the top end redone with a fresh hone and new rings and std KW valves and a stg 1 hotcam. Heres my ?, I wanna add some more power but still wanna be a trail quad and also dnt wanna have to upgrade from my stock carbs. I was thinkin maybe a 686 with a slight port and a stg 2 cam and springs. The only problem I have with tht is I know about the whole weak stock rod deal and dnt wanna blow my engine. I know u can never really tell if its gonna happen or not so I guess my ? is, should I take the chance or just get a slight port and stg 2 cam and springs and call it a day?? Im not dissapointed with the power just from the big 3 but would like a lil more without sacrificing my woods capabilities or the fact I dnt wanna buy new carbs :D.....thanks for any help
 

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Stock bore 11:1 with a stage 2 with a stock unported head is as far as I went with the stock rod. I ran that for a year or so without incident and when I had Barker do the head for me I wanted to be safe running at wot throttle all the time so I went to an aftermarket rod/crank.

I really liked the 11:1/stage 2 setup even on an unported head. For a trail quad it was all I really needed and was still fun in the sand. With no airbox and a good single pipe I was pumping a good bit of fuel but the stock carbs sufficed without need for modification. I view such a setup as the next logical step in your progression, citing that replacing the bottom end doesn't factor into your plans.

I can't guarantee you that the stock rod won't be an issue with such a setup but I ran mine that way and have had 3 friends running similar setups since then on their stock rods all without incident. No one else can make the decision for you, or tell you it's ok. It's something you're going to have to decide for yourself and live with the consequences, should there be any.
 

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~~~ 660 Specialist ~~~
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Discussion Starter · #3 ·
Yea I really dnt wanna get into the bottom end caus I have no idea wat im doin down there and dnt have the funds for tht kinda labor lol. Heres another ? for ya, would just the stg 2 and some port work and leave the stock piston be better on the rod and still give me some more power? Or do I need to up the comp a lil to make the cam perform right?
 

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Discussion Starter · #4 ·
Also since Ive had the cyclinder honed already will it already be too big for the stock bore 11:1?
 

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If you are going to worry about the rod failing every time you start it up, stop your thought process now and simply enjoy what you have.

I wouldn't pair a stage 2 HC with a stock piston. Honing doesn't take away much material, at least as long as it's done correctly and the cylinder doesn't look like an oval when you start. Forged pistons typically have larger piston to cylinder wall clearance specs than cast pistons so you may be fine with an aftermarket forged piston. Check your specs, you may find yourself needing to jump to a 100.5 or larger piston and a bore to get the cylinder back into round.

Good rule of thumb is to measure the cylinder first, THEN buy the piston, unless you plan on simply going much bigger on the bore.
 

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Discussion Starter · #6 ·
sounds good thanks..... i think i just might go with the cp 11:1 stock bore and the stg 2..... if the rod breaks guess it'll be time for a rebuild lol
 

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Crank is not to bad to replace. The worst part seems just all the gasket cleaning to me. I hate that part. It is just alot of bolts and a flywheel puller. It is not bad if you have a impact and I see you already did the one way so I'm sure you know how to remove the flywheel. I picked up a stock crank with carillo rod on here for 150. It was not bad figuring that a rod is at least $100 then you have to find someone to put the rod. I have never had a rod break on me but the motor in my 04 had the rod break before I got it. It was all stock with a hot rod stock stroke crank. No exhaust and stock everything. So there was no big power number on it when this one broke so its just luck i guess.
 

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Discussion Starter · #8 ·
yea i was thinking a falicon knife rod.... but im still a lil unsure bout takin out crank?.... is there a write up?
 

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Discussion Starter · #9 ·
an yes i have done the one way so tht i can handle.... just from tht point on lol
 

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Its just a bunch of bolts and make sure to use lots of locktite when putting it back together. Its a fun job and you can say you rebuilt it. Nothing like fireing up a motor you just assembled and riding it.......until oil pours out the sprocket seal:rofl:. I don't know if the seals dry out or what but all the ones I have held fine and always leak whe putting them back together...
 

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Have a Clymer on hand and start wrenching. The best write up and $30 is right there for everything on the raptor you can't beat it. I picked one up last year and it is a huge time saver.
 

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Discussion Starter · #12 ·
yea my sprocket seal already leaks a lil bit lol.... i think ima get me a manual and start saving for a crank.... ive just been convinced I can do it.... i mean i've done everything else myself.... bout the only thing I haven done is split cases lol.....
 

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Have a Clymer on hand and start wrenching. The best write up and $30 is right there for everything on the raptor you can't beat it. I picked one up last year and it is a huge time saver.
+1 on the Clymer, best $30 I have spent right there. I had only done some very basic stuff on bikes and quads when I needed to do a crank on my bike. I was really worried about it, but the Clymer's and everyone on here made the worry all seem for nothing once I got into it and working on it. I'm pretty confident that once you get started, you will feel the same way as well.
 

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sounds good thanks..... i think i just might go with the cp 11:1 stock bore and the stg 2..... if the rod breaks guess it'll be time for a rebuild lol
If the rod breaks, you will be looking at more then a rebuild, most likely cases and cylinder replacement................:)
 

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If the rod breaks, you will be looking at more then a rebuild, most likely cases and cylinder replacement................:)
Plus you've got Willy here in case you decide you've got too much optimism in your life! LOL!
 

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Discussion Starter · #16 ·
Just dnt let hime show those pics again lol.....Im still havin nightmares. Im pretty confident I can handle it with the right manual....Ive already been as far as replacing the one way cant be too much further than tht lol....thanks again guys
 

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Yeah, I don't want to see those pics again either, haha. Pick you up that Clymers and you will be good to go. Let us know when you get started.
 

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Discussion Starter · #18 ·
will do for sure.... prolly wnt start till it gets cold here caus i do wanna be able to ride more this fall....
 
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