Bigbore 250F

[GASSERMAN]

Just wanted to know about the 280 and 305 bigbore kits, anyone using either one?, how do you like it, compared to stock, bottom, middle, and top end for the different ones and what exhaust are you using with it?

Thanks

[Mike in Fresno]

Ive got a TR 300 kit on my 07 250XCFW. Works great, takes a little rev off the top and pulls way better off the bottom. Stock header and stock 06 can with spark arrestor. Jets and gaskets come with the kit and it ran good right off.

[dunn2500]

i'll stay out of this one rickk...lol

though i am considering beefing up my 250f ktm just dont know which way to go yet

[odonnks]

Have a HT kitted 320 XCF that really pulls hard.

Very reliable and a huge difference around lower RPMs.

[Mike in Fresno]

it seems that most of the kits, TR and HT, are quality and run well. Its just all about how much money you want to spend. The TR 300 kit is low cost and only requires a sleeve in the cyl. Cost for the whole thing including sleeve being put in is around $700.

[twenty34]

i'll stay out of this one rickk...lol

though i am considering beefing up my 250f ktm just dont know which way to go yet

I hear the engine drag is even worse this year with the BB.?

I guess I grew a bit tired of always having the rev this piss out of my bikes, including the 350. But there's no engine drag for sure.?

[twenty34]

Just wanted to know about the 280 and 305 bigbore kits, anyone using either one?, how do you like it, compared to stock, bottom, middle, and top end for the different ones and what exhaust are you using with it?

Thanks

Stock exhaust is best with these. Easy to install, no issues, but the results are stellar. You will loose a bit on the top, but you make up for it in spades low-mid. You'll never miss any loss on top if that helps.

I remember asking the same question, but I'm glad I took the plunge.

For the record, I'd take it over a 350!

Best money ever spent!...Not just saying that either.

http://www.ktmcyclehutt.com/ktm-parts/ktm-parts.php?sku=SXS09280000&category=Engine+Parts&fitment=bigbikes

[dunn2500]

thats what i love about the 350, is virtually no engine braking......and with 100 more cc and efi its pretty easy to get some low end back.........just couldnt afford this time around.......prolly around december i'll get one......for now i got a 250f and its great with a surprising amount of power for a little bike........i may do the sxs factory race kit if i can get a deal on one....with the already pretty heavy engine breaking the ktms have, i am not real keen on adding more even though a bb is more power for a lot less money

[VilleKTM]

I myself feel the engine braking being one of the charms of a 4-stroke bike. One just has to learn to use it for an advantage, young Skywalker ..

[Pete Payne]

When doing a big bore on a 250 f , no matter what brand it is , it is best to add cams and buy playing with the opening and closing times of the int. and exh. cams you can get rid of the engine braking and add some good over-rev.

I know it adds to the cost and takes away from the simplicity of just adding a bigger piston . But if you want to unlock the real potential . Adding cams and tweaking them yield big pluses.

[Timbuck2]

I've been riding a 250-F for about 3 years now and don't even notice the engine braking until I get on a 2-stroke. I think it is great and saves on rear brakes.

[twenty34]

if you ride it like a 2-stroke, you'll never notice engine braking. ?

[VilleKTM]

I've been riding a 250-F for about 3 years now and don't even notice the engine braking until I get on a 2-stroke. I think it is great and saves on rear brakes.

?:thumbsup:

[Mike in Fresno]

along those lines of the cams, I was told to use the SXF intake on my XCFW and the SXF CDI. I have the CDI, next time maybe the cam too.

[dunn2500]

i used to like the engine braking when i first started riding as my cornering/braking was weak and i used it to stop.....i wasnt going very fast so all the negatives hadnt reared their head.........now it creates a lot of hop into rough corners and upsets the chassis in corners/ruts with the up and down motion........the faster i get the less i like it, i have gotten more efficient with the brakes and my corner speed has improved..........the brakes are more than sufficient to stop the bike, if you use them correctly you dont need the motor........a level chassis through the corners is much easier to navigate/control

[penguin327]

Be careful with the 305 kit. It requires a bit of case maching and you also end up with dangerously thin cylinder because of the ammount of overbore. And since the piston is quite a bit heavier than stock, if you dont rebalance the crank you will have some vibration. The best bang for the buck is the 300 kit (actually a 290), makes the 250 even more fun.

[GGKTM]

My engine is out getting a TR320 kit. Should be back home and running in 2 weeks. I'll post a full review. Really looking forward to it!