DavidGibson.uk Posted July 14, 2019 Report Posted July 14, 2019 I've road registered aprilia rs250 fitted with white knuckle racing 465cc bog cylinder engine that mike built. Makes 90rwhp 50 torque Been ultra reliable and very quick. Ive built bike 10 years ago now looking for bit more power . What could I expect swap top end for ported 10mil super serval 72mm cylinder or any other ideas much appreciated. Quote
Fearnot Posted July 15, 2019 Report Posted July 15, 2019 Blue - 10mm Super Serval: 39m PWK - BB Shearer - Pump gas I love the Aprilia RS-250's do you have any pic's of your's online? 1 Quote
DavidGibson.uk Posted July 15, 2019 Author Report Posted July 15, 2019 7 hours ago, locogato11283 said: You have a Cub or Serval now? Yamaha rz250 10mil stroked bottom end, white knuckle racing 68mil conversion on original banshee cylinder, 465c. Quote
DavidGibson.uk Posted July 15, 2019 Author Report Posted July 15, 2019 6 hours ago, Fearnot said: Blue - 10mm Super Serval: 39m PWK - BB Shearer - Pump gas I love the Aprilia RS-250's do you have any pic's of your's online? I tried posting picture on this site, picture to large for your system. That dyno graph represent ported cylinder or out the box ? Quote
Fearnot Posted July 15, 2019 Report Posted July 15, 2019 15 minutes ago, DavidGibson.uk said: I tried posting picture on this site, picture to large for your system. That dyno graph represent ported cylinder or out the box ? Redline ported, Graph was from this thread. 1 Quote
DavidGibson.uk Posted July 18, 2019 Author Report Posted July 18, 2019 I've sent email to Redline Are there any other engine tuning companies that could supply ? Quote
Fearnot Posted July 18, 2019 Report Posted July 18, 2019 57 minutes ago, DavidGibson.uk said: I've sent email to Redline Are there any other engine tuning companies that could supply ? I've never heard a complaint about FAST or HJR. There are rumors of some legendary engine builder named Cain but I've never spoken to him. Quote
locogato11283 Posted July 18, 2019 Report Posted July 18, 2019 I've never heard a complaint about FAST or HJR. There are rumors of some legendary engine builder named Cain but I've never spoken to him.Hahaha. Dude is nuts. Quote
specialblend07 Posted July 18, 2019 Report Posted July 18, 2019 6 hours ago, DavidGibson.uk said: I've sent email to Redline Are there any other engine tuning companies that could supply ? K&T Performance. They also deal with a LOT of overseas customers. https://www.ktperformance.com/ If you have Facebook https://www.facebook.com/KTPerformance/ Redline is good as well. 1 Quote
pp13bnos Posted July 18, 2019 Report Posted July 18, 2019 7 hours ago, DavidGibson.uk said: I've sent email to Redline Are there any other engine tuning companies that could supply ? Your best bet is to call him. The guy is busy to say the least. 1 1 Quote
DavidGibson.uk Posted July 21, 2019 Author Report Posted July 21, 2019 (edited) On 7/15/2019 at 1:14 AM, Fearnot said: Blue - 10mm Super Serval: 39m PWK - BB Shearer - Pump gas I love the Aprilia RS-250's do you have any pic's of your's online? Edited July 21, 2019 by DavidGibson.uk Quote
Fearnot Posted July 22, 2019 Report Posted July 22, 2019 45 minutes ago, DavidGibson.uk said: Love it, you probably have one of the handful in existence of RS250 engine swaps and it must be crazy. CPI is working on a new powervalved cheetah design with a 73mm bore. You could possibly end up with the engine that The Two-Stroke Shop could only dream of delivering and your new power delivery with a PV system. 521 Super Serval 535 Cheetah with PV's You might end up liking the Cheetah better on road because you'll have so much more up top. Only issue you might end up being a guinea pig until builders have the new engine worked out. 1 Quote
DavidGibson.uk Posted July 22, 2019 Author Report Posted July 22, 2019 12 hours ago, Fearnot said: Love it, you probably have one of the handful in existence of RS250 engine swaps and it must be crazy. CPI is working on a new powervalved cheetah design with a 73mm bore. You could possibly end up with the engine that The Two-Stroke Shop could only dream of delivering and your new power delivery with a PV system. 521 Super Serval 535 Cheetah with PV's You might end up liking the Cheetah better on road because you'll have so much more up top. Only issue you might end up being a guinea pig until builders have the new engine worked out. This season the aprilia banshee has been my go to ride , the turn of speed from 40 mph to 130 mph is amazing . Probably say I'm cheetah shy after last attempt Very pleased with the set up as is, but was curious if serval 521 was tried and tested for more. Quote
Fearnot Posted July 22, 2019 Report Posted July 22, 2019 The servals when they came out there were some issues but everything seems to be ironed out with them. There are a few guys on here with redline servals and are very happy with them. Quote
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