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Recap, The last dyno I did ended with 102 hp and 76 tq. Not bad, but i was expecting more. As soon as i got the bike home from the dyno i pulled the plugs and did a compression check. 170 psi front and rear. That told me the motor was hurt. I should have had 190+ psi. The culprit ended up being extreme valve float at upper rpms causing the valves to leak. I made 102/76 with 4 leaking valves. Ok, After that I got in touch with Aaron Wilson at Hammer Performance. This guy knows his stuff. I sent Hammer my top end for a complete redo. 3 months later i got my stuff back. They had to order custom pistons from CP is why it took them so long. Im still waiting on cams from Zippers, so theres not much i can do assembly wise until they show up. Wont be long though. Heres a few pics of the new stuff.

30 degree Full Dome pistons made specifically for this application
51073391743_566e457d52.jpg

51073393543_35e225170f.jpg


Headwork. Much better valvertrain than before. i can rev .600 lift cams to 8500 rpms with this setup
51074087601_b810d65919.jpg

51004908130_172d866eae.jpg


Upgraded the primary too
51073261658_40484a3f81.jpg
 
So now, compared to last dyno, ill have bigger valves, bigger cams, much higher compression 11.9:1 is what the new build makes, ported TB 52mm up from 49mm, A billet primary that shaved 4.5 lbs off the rotating assembly. 120hp is still the goal.
 
I hate you.

Dont forget to mention the work you had done on the crank at Dark Horse. Mikes motor sounds insane and revs so quick and smooth.

My 1170 is going to be 12 gearing also.
 
Last edited:
Ok. Here is the full roll call

New 2008 XB9 crank, Knife edged, plugged, welded, and balanced.
Completely blue printed and rebuilt engine cases
Zippers iron lined aluminum 3.8125 bore cylinders
Custom CP 11.9:1 compression 30 degree Full Dome pistons
Hammer Performance Crush Head work--1.9 intake, 1.615 exhaust valves, comp cams conical valve springs, titanium retainers, 7mm stems
Red Shift 605/591 cams custom made for this build
S&S precision lifters
S&S case studs
Force Big Bore exhaust
52mm ported TB with custom machined Velocity Stack
Evo Industries billet primary with diamond terminator clutch and aluminum front engine sprocket
custom lightened stator rotor
Evo Industries Trans pulley
Boca Bearing ceramic wheel and idler pully bearings
 
I’m hoping for 120hp and 90ish tq at 8400 rpms. I’ll post pics as I build the motor and get dyno results. We are getting close ladies and gentlemen.
 
Last edited:
Zippers just called. Cams are ready and shipping today. Lots to do, but I’m gonna try to have the motor built by the end of the weekend.
 
Heat cycles done, 50 mile trip done, and now I gotta do a 500 mile break in. Fired up first hit. Running very well for not having a solid tune yet. No leaks of any kind. She’s making all the rite noises. I’ll try to get some videos uploaded soon. Stay tuned
 
mike lowary said:
Heat cycles done, 50 mile trip done, and now I gotta do a 500 mile break in. Fired up first hit. Running very well for not having a solid tune yet. No leaks of any kind. She’s making all the rite noises. I’ll try to get some videos uploaded soon. Stay tuned
Click to expand...

That's awesome man!
 
mike lowary said:
Heat cycles done, 50 mile trip done, and now I gotta do a 500 mile break in. Fired up first hit. Running very well for not having a solid tune yet. No leaks of any kind. She’s making all the rite noises. I’ll try to get some videos uploaded soon. Stay tuned
Click to expand...

I dont know what the big deal is. My bike came stock with a 1203 and I'm gonna make it a 1275. Must be some XB9 thing. :black_eyed:
 

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