well thanks to a friend..he's gonna let me try out some springs and stuff to see which one i liked the best. i have a AAEN torquer, .020 over, KN filter...thats about it for performance mods so any suggestions are great[img]i/expressions/face-icon-small-cool.gif[/img]

but anyway..im gonna tear it apart this weekend and take it down to nicholas cycle to see if i can't get a trail port done to the sport. just postin here to see if there was anything i needed to know before i tore into it? any tricks? or things to watch for? also..afterwards...what kind of jetting changes are required?

thanks for the help

 

If you get the port job spend just a little more and get the head milled. The port job will really wake up the 400.

 

well...i have had it .020 over....im guessin its not too much more to have it done?

 

Is it .20 over for the bore or the milled head. There is a difference. The bore will do nothing in performance but getting the head milled will raise your compression.

 

to be honest with you..i really don't know. i'm guessing it was just .020 over becuase it was just a top end job. i just sent it in to nicholas and told them to fix it...this was long before i found this site and knew anything about my quad.

 

So then if they bored the cylinder you should get the head milled .20 under. It should not cost that much more. It cost me about $35 to do mine.

 

I jsut stripped down my tblazer 250 which has about the same body as yours and it took me about 2 hours. Just loosened bolts and worked my way to the cyclinder. I here you guys talking about head milling. Can anyone tell me what exactly head milling really is and if i should do it to mine, and if it will add hp.

 

This is some really sound advice here yama. Get a girdle!!! I had my trail mod break both sides of the cases and broke my cylinder. Get you a aaen girdle. Well worth the money and really cheap insurance.

 

yes,in your case a trail porting will do best and trail heads,the engine
still dependable without girdle in trail mods version.
when become time to clutch,you can use sleds primary spring to end up
the the shift you like to,remember to fine jetting the thing,the pwk
is the best lower cost to run carb available for the 400,so let take a look to it in the first mods to buy.

 

I would totally have to disagree. I already know of someone else that I ride with on ocassion that has had a cylinder break that has a Ritter trail mod. Why not get a girdle to be on the safe side. Cost of cylinder new (350.00) then have the new cylinder ported (200-250 )and probably a new piston (75-100) since he's gonna probably be at a .040 over THEN pay for a girdle kit. Why not just get a girdle now. I know that Rick reccomends getting a girdle for a trail mod. I guess you didn't happen to see the pics of my blown up motor when I posted "Better support your trail mod". Total cost if he does break a cylinder 625.00. Then the cost of a girdle installed (150.00). Why pay the extra 625.00?