You would need to have a machinist put in the sleeve. They will have to remove the original steel sleeve, and bore out the aluminum "block" or jug to fit the larger steel sleeve. Then, they heat up the jug to expand it and cool down the steel sleeve to shrink it, and stuff it in there before it returns to normal temp so that it will end up with a very tight fit. Sounds hard, but any machinist can do it.

The head doesn't necessarily need to be machined just for a big bore kit. Some people would perhaps want to shave it a little to raise compression, but it's not a must. However, while you have your head off, have a machinist check the valves to make sure they seat good. You might want them to redo the valve seats and possibly replace the valves and springs with fresh new ones if it's necessary.

The one extra item you will probably want to modify is your cam. You wouldn't want just any machinist to do this if they're not familiar with these particular engines. Typically if your stock cam is in decent shape, you can ship it to a company and they'll either regrind it or they'll give you credit for the core and ship you one that's already modified. Let them know what all your doing to the motor (size of big bore kit, compression ratio, and what your goal is) and they should know what you need. Basically, they'll build it up with metal and regrind it so that the valves open higher and/or for a longer duration. In this case, I would probably call LA Sleeve since that is the manufacturer of this particular big bore kit. They also grind cams and would probably know exactly what you need.

A new clutch is another item that is not necessarily a must for a big bore kit. Generally it's a good idea to upgrade the stock clucth springs if you increase the power output quite a bit from the stock motor simply because the stock clutch is designed for the stock engine. However, it's fairly easy to replace the clutch after you've put the engine back together and in the quad. If money is an issue, put it all back together and test it first. if the clutch slips, replace it. If it doesn't, use it until it needs to be replaced.

 

Just want to ask a question while everyone is on this topic with racing mods, i got a lt 230, and got it all rebuilt and is starting to come together. Anyways i was looking at making my airfilter an open element air filter. If i am not mistaken are most guys when they do this jsut taking off the airbox and air intake tube and mounting hte air filter directly to the carb or jsut off of it with a short tube(correct me if i am wrong) I have a K & N filter and jsut wanted to knwo what you guys think about it. I won;t be gwtting the quad bogged in mud. So please help me out and hopefulyl i can get this quad finished up!!
Cheers
Paul

 

as for yer open filter question. my 230 has a uni pod filter mounted directly to the carb. and it works great. but if u have a k&n make sure its a really small one cause i mounted one up and it wouldnt fit right cause it was to big to clear the frame rail. i suggest buyin a uni pod filter for like 10 bucks

 

Loudchevy, do you have a pic of your air filter setup? Did you notice a gain with it? Any drawbacks? Thanks!

 

thanks man, i'll look into one, where did you get yours, and also if you got them can you send me a couple pics of your setup!!
Cheers
Paul

 

Loudchevy, I found the UNI pod filters... What size did you get? Also did you rejet your carb?? Thanks!

 

Tag:Where did you find yours?
Loudchevy: Also waht pipe are you using and what jet settings??

Thanks boyz and help is wicked?!

Cheers
Paul