Topic: Blackfin CB750 F1 BLASTER

[Blackfin5]

Have had the new pipe on for a couple weeks.  Fitment in head exhaust ports is outstanding.  Tucks in tightly with room to remove stock oil filter and drain plug.  Sounds a little deeper than the gpmoto pipe especially at higher RPMs.  4-2-1.

[Blackfin5]

Hey Don....I found a GL front for sale on the forum.  Will my stock CB750F front hub and axle work?  Or must I also get a GL hub and axle.  I would hate to have to rebuild and relace another hub.

[SOHC4 Cafe Racer Fan]

Excellent find.  The stock hub is identical between the 750 and GL1000, but I believe that the GL axle is slightly wider.  You will also want to retain the GL1000 speedo drive.  FYI, the rim on the GL is the same size as the 750 but it is aluminum and not steel for less weight (if only all of the CBs used aluminum rims stock).

[Blackfin5]

Thanks, Don.   Very good to know.  Probably need the GL spacer too.  I'll have to source the axle.  Will use a digital speedo.

[Blackfin5]

Now that the Danielle 550 is shaken down, being ridden regularly, and will be my main ride for summer, it's time to start Phase 2 of the Blaster project (and I have to keep up with Cal for bragging right's sake).

I already have my chit in for a Gordon frame kit.  I'm planning on cutting the frame to get the head and cylinder out.  Going with Wiseco 836 pistons, a Megacycle cam, and go with either a Stage III or IV for the head if Mr. Rieck has availability.  I still do not comprehend or appreciate the distinction between a III and IV.  I will keep the stock bottom end in tact and sitting in the frame.  I'll weld on the frame kit after the head/cylinder is removed.  Not quite sure if I'll get CR29s for this phase or run the stock carbs with some slider work.

My plan then is to run the 836 Blaster til a major failure, and then do a frame up build hosting a balanced, lights out 915cc engine (ala Tweakin).

I'll start posting pics as soon as I cut into the frame.  In the meantime, the next couple weeks I plan to ride the cr*ap out of the Blaster.

Cheers!

[SOHC4 Cafe Racer Fan]

Now that the Danielle 550 is shaken down, being ridden regularly, and will be my main ride for summer, it's time to start Phase 2 of the Blaster project (and I have to keep up with Cal for bragging right's sake).

I already have my chit in for a Gordon frame kit.  I'm planning on cutting the frame to get the head and cylinder out.  Going with Wiseco 836 pistons, a Megacycle cam, and go with either a Stage III or IV for the head if Mr. Rieck has availability.  I still do not comprehend or appreciate the distinction between a III and IV.  I will keep the stock bottom end in tact and sitting in the frame.  I'll weld on the frame kit after the head/cylinder is removed.  Not quite sure if I'll get CR29s for this phase or run the stock carbs with some slider work.

My plan then is to run the 836 Blaster til a major failure, and then do a frame up build hosting a balanced, lights out 915cc engine (ala Tweakin).

I'll start posting pics as soon as I cut into the frame.  In the meantime, the next couple weeks I plan to ride the cr*ap out of the Blaster.

Cheers!

Kevin,

The Stage IV is the Stage III plus the CB750 Kibblewhite 5mm valve conversion kit (34mm intake/28mm exhaust valves, guides, seals, springs, Ti retainers, spring bases and lash caps).  It is the Full Monty, the Entire Enchilada, the Dog's Balls, etc.  "It is so choice.  If you have the means, I highly recommend picking one up."  (Ferris Bueller)  Since you are so equipped, do not deny yourself squeezing some additional and reliable performance out of your motor. 

Doctor Dave is pulling over 80 bhp out of his F.  This is the spec I am going to run on my 836 Bionic Mongrel build.

Don

[Blackfin5]

Ahh, Cal, that's just a new fangled fad like m-units.  And hopefully, by the time the 836 blows up and I go for the 915, these kids will have come up with something new and improved.

Happy Easter!!

[Blackfin5]

LMAO...he emails me with a copy of your invoices.  Busted.

[SOHC4 Cafe Racer Fan]

Kevin,

FYI -- I am pretty pleased with the performance of my 750 (Nine Lives) - 836 Wiseco kit, Stage 2 head, M3 Racing heavy duty cam chain tensioner, hot street cam, CR29s. 

I think that with your spec motor AND the ported head, the CR29s would be a good choice.  I've had no starting or bogging issues, and much improved power/torque.

[MRieck]

Kevin,

FYI -- I am pretty pleased with the performance of my 750 (Nine Lives) - 836 Wiseco kit, Stage 2 head, M3 Racing heavy duty cam chain tensioner, hot street cam, CR29s. 

I think that with your spec motor AND the ported head, the CR29s would be a good choice.  I've had no starting or bogging issues, and much improved power/torque.

That's a good combination.

[SOHC4 Cafe Racer Fan]

Kevin,

FYI -- I am pretty pleased with the performance of my 750 (Nine Lives) - 836 Wiseco kit, Stage 2 head, M3 Racing heavy duty cam chain tensioner, hot street cam, CR29s. 

I think that with your spec motor AND the ported head, the CR29s would be a good choice.  I've had no starting or bogging issues, and much improved power/torque.

That's a good combination.

I'm more excited about my Bionic Mongrel motor:  Back-cut trans, HD primary and cam chains, HD tensioners, Mike Reick Stage IV port/valve job, balanced crank/rotor, 836 Wiseco kit, CX7 cam, and likely RS34s.  This is pretty much identical to the Doctor Dave Hiller motor.  I cannot wait to experience the Mike Reick difference!  That head is a work of industrial art.

[Blackfin5]

Don, a Bionic type build is very tempting, but I'm going for a quick turn around by not splitting the cases this time and leaving the block in the frame.  Thinking a Stage III with CR29s and a 125(?)-60 cam.  I can feed in a new timing chain too.

Save the IV for the 915 with Carrilos and b/l crank.

[SOHC4 Cafe Racer Fan]

Save the IV for the 915 with Carrilos and b/l crank.

Hold the phone. Which build is that for?  Awesomeness!!

[Blackfin5]

For when after the Blaster 836 top end fails.  I figure, hopefully, at least 2 years or more down the road.

[SOHC4 Cafe Racer Fan]

I suppose if you like to pin the throttle wide open all the time.    The 915 sounds mighty Tige like.

[Blackfin5]

Tige's 915 is the inspiration but that plan is on the back burner till way down the road.  The only 915 concern is proper cooling for here in SoCal even with an oil cooler.

For the 836, I'm just wondering whether a JMR Stage IV is worth it without lightening/balancing the crank, and if keeping stock studs and rods, since I am not splitting the cases.

In the meantime Don, I was finally able to cut in front of you on this 78 550.
Cheers!

[SOHC4 Cafe Racer Fan]

That 78 is beautiful. Great score!

Your 836 will be fine without a cooler as long as you don't camp in gridlock traffic for extended periods. Mine does just fine without a cooler.

I am going to run a Seatrab in my Bionic Mongrel build given the level of investment in the motor.

I think you'll be fine with the Stage III but I would use HD studs and a MLS head gasket.

[Blackfin5]

Do you think there is a downside in swapping out the studs one at a time with the cases still together?

BTW...the cooling concern is with the future 915, not the upcoming 836 although I am planning on a cooler.

[Blackfin5]

Just on the 550 I needed to soak bottom stud threads with PB blaster and use torch on the underside/indide of the case to break the studs free.

You advise Cal, and I will follow (to a reasonable extent)!

[SOHC4 Cafe Racer Fan]

That 915 is going to be a beast, Kevin. 

I picked up one of the smaller Setrab oil cooler's from a local dealer in Long Beach.