Broken crankcase, can I fix it myself?

R&R of the motor is a pain in the arss if you ask me . I plan on doing it my self again this winter . for you it would be a great time to do some mod's

Had a feeling it would be a pain, but is it doable for an a average Joe though? And what can I upgrade once I have the thing open? It'll be a perfect time to do so. Thanks.

install stoker crank . may want to replace oil pump , cam chain

Like, replace those with aftermarket or OEM? And how about a big bore kit? Also, what special tools would I need?

Can install a big bore later. That does not require pulling the motor and splitting the cases. The crankshaft does. Hot Rods +3mm. Do a search on this site. You may need to notch the piston skirt for the connecting rod. Cataway has some pictures of how he notched his piston for clearance.

This is the cheapest I found the stroker crank.

TRX700XX Hot Rods Complete Bottom End Kit

Yea, you’re right. Are there any other options out there for the stroker? I don’t mind spending more for a better bottom end kit. I just don’t know which ones are good.
What do you mean about notching the piston skirt? I’ve tried looking for cataway’s thread but couldn’t find it.

Kubi07 said:

Yea, you’re right. Are there any other options out there for the stroker? I don’t mind spending more for a better bottom end kit. I just don’t know which ones are good.
What do you mean about notching the piston skirt? I’ve tried looking for cataway’s thread but couldn’t find it.

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http://www.club700xx.com/vb/8-motor...al-intake-exhaust/18841-stroker-big-bore.html

Thank you M_Quick. Upon reading that thread another question came up. Would I need a fuel programmer if I install the stroker? The ATV right now is all stock except for the K&N air filter. So I don’t have an exhaust or fuel programmer or know how well to use one.

Kubi07 said:

Thank you M_Quick. Upon reading that thread another question came up. Would I need a fuel programmer if I install the stroker? The ATV right now is all stock except for the K&N air filter. So I don’t have an exhaust or fuel programmer or know how well to use one.

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I would have to say yes. And if you purchased the controller through EHS racing, just let Eric know your list of mods, and he probably would pre program the controller for you with the proper map needed.

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I’m thinking I should might as well buy the EHS big 3 then. How can I get in contact with Eric to let him know?

Kubi07 said:

I’m thinking I should might as well buy the EHS big 3 then. How can I get in contact with Eric to let him know?

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Goto his website click on contact information and call him directly. That way you can talk him into a free t shirt or something with your order.

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Lol okay, sounds good. Now that I know what to upgrade, let’s go back to my original question. Is it possible for me to tear everything open and put it back together with no problems? I don’t really have much experience when it comes to stuff like that. It I have been thoroughly looking at the service manual and it seems doable. What do you think?

Depends on your knowledge, and or expertise. I've tore down many auto engines in the past, and I've done a lot of work on the quads I've owned. I have never split a case, and have herd it's a pita! If you have the proper work space, & tools, including but not limited to a parts washer, then I'd say you should be okay. There may be a few specialty tools needed, for pulling crank bearings and what not. I had a heck of a time getting the cylinder head cover separated! I tried and tried and then my wife came out, and pointed at a spot and it came right apart with one easy tap! lol.

Well that's not comforting to hear. If I do tear it apart, is there anything I need to know in terms of what I need to adjust. I know I need to adjust the valves and the cam chain right?

I am grateful I have a overhead lift to get the motor back in the frame . oh I feel you can take it apart ,but after you get in to it you may ask your self , why did I do it .

If your engine case is cracked like you said, then you have nothing to loose by taking it apart. I'm interested in knowing what came apart to crack the case.

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Yea, you have a point. I'll take pics when I get into it. Might take a while since I'm kinda busy. Just taking apart everything else right now to get the engine out.
And I also wonder what happened. When I drained the oil, coolant came out first followed by oil and some metal shavings.

Kubi07 said:

Yea, you have a point. I'll take pics when I get into it. Might take a while since I'm kinda busy. Just taking apart everything else right now to get the engine out.
And I also wonder what happened. When I drained the oil, coolant came out first followed by oil and some metal shavings.

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sounds like piston came apart.

Just came across this on ebay...although I'm thinking it's a little much since a few of us on here bought the whole machine for around $2,500. At any rate, here's another option in case you'd want:

https://www.ebay.com/itm/122845383176?ul_noapp=true