In the interest of finding more power........

[Sheetmetalfab]

2 test rides in the hills.

First one the intake was getting plugged pretty fast (sac deep and fluffy).

Second i moved the fuel tank back and down to the tunnel. Sealed the intake and added Pre filter. Clutch started slipping under high load. (Cheap azz used bike)

Ready for another test run now.

Even mounted the gauge for the temp readout.


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[Sheetmetalfab]

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[El Gringo]

Nice work, I bet it sounds awesome when it gets Reving. Used to ride with a guy on an Apex, that was a tank but sounded awesome. I will be interested to hear how you like it once you get a few of the bugs worked out. Great to see some different things being built.

 

[Sheetmetalfab]

Geared this thing down 3 teeth on the jackshaft sprocket.

Replaced all the bearings.



Adjusted the suspension until it makes a nice balanced wheelie.



I definitely think I have a winner here, serious arm stretch factor.

Aro ski on the front.



Cuts a decent slice and dice through the trees.

Comfy seat concepts seat from a yz450f.

 

[Sheetmetalfab]

Yz450f pegs and brackets.

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[Northwestguy]

Your tools are hogging your kneeling pad. Nice Knipex pliars......

 

[Sheetmetalfab]

Your tools are hogging your kneeling pad. Nice Knipex pliars......

2” closed cell duct insulation.
Feels like heaven on the knees.

Seems like every project is a tool explosion then shovel them up and organize into the box (es)

 

[barefooter]

Great to see guys pushing the boundaries. This may get me to actually build that v-twin Suzuki......

My big issue was where to put that hog of a gas tank. How does it work with the fuel cell on the frame of the skid?

 

[Sheetmetalfab]

Great to see guys pushing the boundaries. This may get me to actually build that v-twin Suzuki......

My big issue was where to put that hog of a gas tank. How does it work with the fuel cell on the frame of the skid?

The fuel (and weight) lowered and moved back made a huge difference in handling.

I also looked at vtwin bikes and they all make such pitiful power and have short rev ranges to work with. (The motors weigh a lot more than an i4)
I steered away.

I think a gixxer 750 might be a good choice.

All about what’s available used/ wrecked and or reasonable.

 

[kraut]

More power

The fuel (and weight) lowered and moved back made a huge difference in handling.

I also looked at vtwin bikes and they all make such pitiful power and have short rev ranges to work with. (The motors weigh a lot more than an i4)
I steered away.

I think a gixxer 750 might be a good choice.

All about what’s available used/ wrecked and or reasonable.

Right now I am contemplating on building a moto x bike with a Gsxr 750 efi .Just like a hill climber but throw a snow kit under it. Less work to convert.

 

[Sheetmetalfab]

Getting ready for the new season.

Brockstar racing built forks. (48mm WP ktm open cartridge)

Decent riser and bars.

Raised the height of the whole bike 2”

Brought the drivers 5/8” forward.

Lowered the seat 1.5”.

Lowered the subframe 1”

Timbersled convex track (hopefully on its way soon)

Steering angle is 5 degrees steeper than last year. (Rotated the whole engine assembly)

 

[Sheetmetalfab]

Tucked the exhaust in tight.

Different silencer.

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[Sheetmetalfab]

Cut and welded in a beveled top of the chain-case cover.

Much skinnier in the ankle area.

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[Sheetmetalfab]

Notch the frame and weld in pipe slices to increase turning angle.

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[Answ3r]

Did you weight you creation ?

I recall you saying the old doo 800 CVT build had too much giro... How's this one ?

Keep up the good work !!!

 

[Sheetmetalfab]

Did you weight you creation ?

I recall you saying the old doo 800 CVT build had too much giro... How's this one ?

Keep up the good work !!!

I haven’t weighed it complete yet.

Just the parts i was swapping out.

 

[Answ3r]

I would assume your taking off a lot more weight on a sport bike than on a MX bike with the twin front brakes, fairings, lights, etc.

 

[El Gringo]

That looks like an awesome build, great to see all the tweaks you are making. I'm sure it will be a blast to ride and sound amazing at 14,000 rpm. Can't wait to hear a ride report, in my experience the convex tracks make a big difference in handling. Thanks for sharing.

 

[jrusher]

Notch the frame and weld in pipe slices to increase turning angle.

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Nice build and work!
I found a Kawi ninja 650 engine that i was thinking of stuffing in a mx bike frame. Its super compact parallel twin. 48 ft/pounds torque at 7000 rpm. So considerable gain over the 450 mx engine. Has decent torque down low

 

[Sheetmetalfab]

Nice build and work!
I found a Kawi ninja 650 engine that i was thinking of stuffing in a mx bike frame. Its super compact parallel twin. 48 ft/pounds torque at 7000 rpm. So considerable gain over the 450 mx engine. Has decent torque down low

Keep in mind that the 650 twin motor weighs more than the 600 i4 (all brands) but the 600 i4 has almost double the power with a longer rev range.

The 600’s (race motors) have the lightweight internal parts that reduce gyro effect.

Personally I wouldn’t waste time with a twin or vtwin 650. (Consumer only motors with mellow power)