Sparks Racing 465 National Kit?

[timewass]

Their site says this engine is for someone who wants a very strong, but reliable engine. How reliable do you think a 465 is? That's a very large bore compared to the stock or even the 440 which is very large. Is there even much aluminum left after putting in the 465 sleve?

[NacsRacing400]

It is a 440 sleeve, then they stroke it to get the cc's up to 465. I dont know how reliable it would be but i think it would be about as reliable as a 440.

[mopar 400]

Last weekend I actually rode one of Sparks 465 National kits. I was out at Pismo and a guy out there had his engine done over a year ago, and has had no problems at all. Sparks Engines are some of the best in the country. They are fast as shi@.

[Claas900]

..Hey NacsRacing400 are you sure its stroked??Sparks uses a thick sleve the hole way down,a 440 is a 88.5 bore,or close to an even 89,but i thought he used a 92mm bore to get a 456 out of it,i thought it was all bore??But I could be wrong??And timewass if it built by Sparks go for it,He's one of the best,you'll pay for it,but you get what you pay for..Thanks

[FullBore52]

nope, sparks doesnt stroke their's. Its a 92mm piston in their own sleeve.

It's a 88mm bore which is the same as a 426, with 6 mm stroke that comes out to 463.79 something cc's(that is what TC did for 465stroker). There are also 460 kits that are just a straite bore and 460 kits that take a 69mm piston (which is what you get in your 440 kits) and strokes the crank 4mm. That is what LRD's is. i am pretty sure that sparks is a stroker.

i want to retract my statment a 92 mm piston does take the cc's up to 465 exactly. So i have no idea if spark's is a stroker or not.

[FullBore52]

Sparks is NOT a stroker. 465 Pure Power (http://www.sparksracing.com/Sparks_Center/400X/Sparks_465_pure_power.htm)

Search for TrX465 on this board as well and read his sig. He has the sparks 465. Notice that page does not include stroking..

[timewass]

Thanks guys. I have a friend who has the 465 national and wants to sell me the engine because he wants to go back to a 440 for MXing.

[Nausty]

So is that the cc limit for 4 strokes? I figured the 2 stroke cc limit would be 250 or 310 and they race banshee's? What about raptors? I heard the sparks 465 kit is pretty reliable. Why does he want to move down to a 440?

[timewass]

He says that the 465 is a powerhouse, but it just doesn't get up and spining (rev) as fast as he would like it to. He said the 440 is smaller and can rev fast enough.

[trx400ex]

nausty for 2 strokes the limti is 265 for 4 strokes the limit is 440..this is only for certain classes, banshees generally race in the open class