HSR48 Mikuni on XRL


5 replies to this topic
  • crmc33

Posted May 24, 2007 - 11:56 AM

#1

Little bit Off Topic but heres some pics of my 675 track day bike with its latest addition, lenthened inlet tract with HSR48 flatslide. Runs so well without the pumper I dont really think it needs it. Will give it a go at some stage.:ride:
No loss in midrange power but a healthy 10% increase form last year, now upto 55HP (rear wheel)
Needs a better ignition to let it rev... Anyone got any ideas? :)

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  • mgs781

Posted May 24, 2007 - 12:01 PM

#2

Little bit Off Topic but heres some pics of my 675 track day bike with its latest addition, lenthened inlet tract with HSR48 flatslide. Runs so well without the pumper I dont really think it needs it. Will give it a go at some stage.:ride:
No loss in midrange power but a healthy 10% increase form last year, now upto 55HP (rear wheel)
Needs a better ignition to let it rev... Anyone got any ideas? :)

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Beautiful, more picture please. Very professional, how fast does it go?

I had mine at 99.1 mph on the way to work.

http://www.thumperta...achmentid=13913

MGS

  • XR650L_Dave

Posted May 24, 2007 - 01:57 PM

#3

Yeah, for more oomph get an XR600R CDI on there, its supposed to have a much more aggressive advance curve.

You just need to put on a 600R stator and ditch the Estart, or make 250V 400-600Hz from +12V.

Dave

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  • crmc33

Posted May 24, 2007 - 02:28 PM

#4

Theres no electric start or kick! Push start only.
Im seriously thinking about buying a performance XR600 CDI from Ricks' in the Us for $60.
My question is if I put on a XR600 stator and regulator, will I also need a XR flywheel or would my XRL flywheel work. The flywheels are stupidly expensive to buy new.

More pics and data at http://motopike.com/Supermono.html.
Dyno curve shown is for the engine before the latest mods (XBR500 head and HSR48).

How quick is it? It need a bit more extra top end power ideally but makes up for it through the corners. The hardest bit of riding it hard is the engine compression under braking. It gets a little bit squirrely at the back!
Im aiming for 60HP. This shoudl be enough to pull 130-135 with the right gearing at fast tracks.

The best bit of the bike is the sound ;o). Its currently only just race legal at 105db. I didnt build it to make it the fastest supermono on the planet. Just something different to take on track days. Life is too easy on GSXR/YZF/ZXR's

If anyone needs any tuning info just send me a pm. Ive owned the bike for ten years (built from scratch) so I know it inside out! :)

  • CTXr650L

Posted May 24, 2007 - 05:52 PM

#5

Now that is amazingly cool :) :bonk: just out of curiosity, what sort of compression are you running?:ride:

  • crmc33

Posted May 25, 2007 - 01:03 AM

#6

The compression is around 11.5:1 approx.
(102.4mm piston with XBR500 small dome head). Ive not gone any higher for ease of starting.





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