87 Honda CBR600, AHRMA vintage racer project

[Buffalo Bill]

Ok, wow! Just learned AHRMA has OK'd a new Next Gen Superbike Middleweight class!
The 87-90 CBR600 is in!
I've restored my rescued 87 CBR600, almost sold it before somebody on FB, AHRMA Swap Meet told me the good news!
Now all I need to do is the strip downs, bolt ons, safety wirings and it's track worthy.
Anybody know if the F2 rear wheel can be fitted to the F1?
Thanks!


Some naked pics from 2019:

[Buffalo Bill]

This project post is gonna take a while to get going. This will be my winter project.
Have a list of stuff to buy:

Race prep budget
* Race tires:
Bridgestone S20 EVO_$105 rear, $98 front, = $203
Pirelli Diablo Russo II_$121 rear, $103 front, = $224
Michelin RS_$134 rear, $117 front, = $251
Michelin Power Cup EVO_ $180 rear, $145 front, = $325
Fork springs: $117
* Steering damper $33
* Rear shock: $000?
* Shifter upgrade: $140
* Ignition advance: $110
Pegs: $40
Panel-headlight: $21
Panel-tail section: $206
Panel: oil pan:

Total cost_$385 - $1000.+

The work list will include a valve job.
The tailpiece/seat will be a little work, but did that to my GSXF Katana.
The bike only weighs 435 lb topped off and street legal.
It'll be EZ to get that down to 400 lb track ready.
Amazing bike.

[GregT]

I put the shifter upgrade into the one I built recently. Not sure at all if it's worth it but the customer provided it.I don't remember any problems when we raced these things back in the day.
Seeing the box is properly undercut is probably a better spend of the money.

Once the squish clearance is correctly set, you don't need the ignition advancer. Stock is good on a correctly built engine.

[Buffalo Bill]

Seeing the box is properly undercut is probably a better spend of the money.

Greg, please explain this detail: undercutting the box.
Thanks a bunch for the tips!

[Nessism]

https://www.aperaceparts.com/transmissions.html

[Buffalo Bill]

https://www.aperaceparts.com/transmissions.html

Thanks a bunch Ed!

[RichDesmond]

On the undercut, since it's not cheap to do I'd do some research on Honda or vintage race forums to see if it's needed. Some bikes are fine without it, others really need it.

If you do decide to do it, these are the guys I've used in the past:

https://www.murdochracing.com/parts.htm

[Buffalo Bill]

Thanks Rich!
Currently my experience with shifting the CBR is: no problem with upshifting to 2nd below 7,000 rpm. Above that RPM it demands taking more time and care, but does not pop out if done carefully.
A lot of the missed shifts I blame on not being familiar with the particular demands of 1980s CBR transmissions, and mostly from moving back and forth between my Suzuki GS, GSXR 5 speeds and the Honda 6 speed transmission.
I so rarely have to shift down to 1st on the track, it's not relevant.
I used to find false neutrals quite a bit on my GS1100G the first couple years I owned it. Never happens now, that's skill development, and better boots.

[GregT]

Greg, please explain this detail: undercutting the box.
Thanks a bunch for the tips!

I've done it myself for many years. Whether it's required is decided by examination of the dogs. Rounded off tips can be built up by welding - TIG of course.
It is dependent on how much of a hamfoot the previous owners were....

Worst I've had to sort was a Hayabusa engine from a roadrace sidecar. Bent selector fork rails meant a lot of buildup and grinding work.

[Buffalo Bill]

I've done it myself for many years. Whether it's required is decided by examination of the dogs. Rounded off tips can be built up by welding - TIG of course.
It is dependent on how much of a hamfoot the previous owners were....

Worst I've had to sort was a Hayabusa engine from a roadrace sidecar. Bent selector fork rails meant a lot of buildup and grinding work.

Greg DIY is very cool, not many new gear cogs available for old bikes.

[Buffalo Bill]

Ok, been doing some research for parts sources.
Tires: Michelin RS
Valves: Vesrah valves shown on ebay
Shock: Hagon M61052, spring load adjustable
Fork springs: Racetech, 0.90 highest rate available (installed already)
Body parts: https://www.airtech-streamlining.com...00F1198790.htm
Panel-headlight (CBR F2)
Panel-tail section
Panel: oil pan:
Head gasket: Athena, UK ebay ( purchased already )
* Shifter upgrade: ( CBR600, hurricane, jet, carb, tune, tuning, Data by EC997a Eddy Current Dynamometer )
* Ignition advance:

[Buffalo Bill]

New windshield made from Lexan 1/32 in.

[Buffalo Bill]

Hey if I had the gold coin:
Keihin FCR 33 carb rack, Only $1400.

[RichDesmond]

Hey if I had the gold coin:
Keihin FCR 33 carb rack, Only $1400.

Ooooooh, sexy!!!!

[Buffalo Bill]

Not so sexy butt, I started shaping the race seat: