Which Power Mod would you pick if you could only pick one

[Crapflinger]

for a '15 250l.

if you could only do one or the other, would you choose to get the big bore kit (with ejk +stock exhaust), or the (any of them) exhaust kit (with ejk)?

Edited November 7, 2018 by Crapflinger

[KLeptoLee]

Big bore or 300 swap and ejk will net more power than a pipe an ejk

[kyss meg bak]

While I haven't put a lot of time into research, seems to me there has been some questions on longevity of the Big Bore kits. So I'd either stroke it using Honda parts or do a 300 swap. If this is too much, then I'd suggest the exhaust and tuner.

 

Others with more experience with the big bore kits might shed more light on their long term reliability.

[slotracer577]

Bigger bore. Longer stroke really only moves power down in rpm while a bigger bore adds power. Power is proportional to piston area.

[Crapflinger]

if anyone has objective evidence of durability issues with the bill blue big bore kits specifically I'd love to see that. my buddy has the 351 kit on his KLX from bill blue and it's been rock solid for like 5 years.

[Crapflinger]

@gnath9 you don't accept PMs anymore so....hopefully you're around and you get a notification. read through the 305 owners thread (at least until posi blew his engine and the thread devolved into if you could put the cbr300r engine in or the cbx500 or whatever). that thread hasn't really been updated with anything 305 related any time recently. just wondering what your current 305 status is. what have you had to do related to it since you've had it for a billion years now.