squeezing a little bit more power of a CB250 engine

**Takunrsx** · 04-10-2016, 08:42 AM

hi, i have a lifan 250-4, been riding it four a couple of years, and now that im gonna re build the engine, i was wondering if you guys have any suggestion for squeezing a little bit more power out of it.

the engine is a 2 parallel cylinders 233cc....its a copy of the honda rebel

for starters, i was thinking on boring it out a litte bit....any other suggestion guys?

**humanbeing** · 04-10-2016, 11:15 AM

Machinist suggested [GY6 150cc (KBF) /+0.5mm] http://www.chyangwa.net/thread-17478487-1-1.html 13#
Other option: AN150 http://www.chyangwa.net/forum.php?mo...uthorid=295682 11#
----
<Ironic epic> Mailed barrel to the machinist above ie. http://item.taobao.com/item.htm?id=21364656584 BUT doesn't check 1st: it's "weird" 14mm pin ...
Re-mail to machinist AGAIN +0.1mm (for Suzi EN125 +0.5mm piston & rings)
Drunk during reassembly (500ml of http://en.wikipedia.org/wiki/Erguotou) ... Apply too much gasket maker, oil path blocked ...
http://translate.google.com/translat...398&edit-text=

**Takunrsx** · 04-10-2016, 11:57 PM

is that the only choice? i was thinking on putting 2 pistons from the bajaj 135 and leave the bike at 280cc, and just for the sake of longevity, im adding an oil cooler as well, is nothing else to do?

**humanbeing** · 04-11-2016, 12:54 AM

http://www.shrirampistons.com/pdf/pr...-Catalogul.pdf
DISCOVER 135cc DTS-i 21.3
http://www.mingyang-group.2u.com.tw/...on&%20ring.pdf
CA250 22
Seems OK in theory ... Ask ur machinist for exact answer ...