Topic: Purple Rain Bill's CB750/900 Turbo 1972

[Bill/BentON Racing]

Looks like Jimi had Purple covered first and since it turned out to be a 1972 and already was called Purple Haze
It Stays!
It needed a little TLC!

So a little paint,elbow grease etc.

The Wilbur and Bill all we had tach! Thanks again Wilbur!!

GSXR Elec tach

What we hope the comp sees!!!

Keihin carb with choke!

Rajay Turbo

Got rid of those hideous blue grips!

I like it!!!!!!!!

Getting there.

Now what I know so far
Honda 1972 CB750K frame
1973 engine
RC 900cc kit
RC Ported/Polished head
MTC Rods
Mild cam
Rajay Turbo Kit
Keihin Carb
Dyna S ignition
Hi/perf coils,not sure whose
K&N filter
Pingel petcock
Drag bars
CB400Hawk F/end complete
Weighs 435 wet
CB750/900/1100F Tail section
Custom seat
CB500/550 swingarm 4" over
Laydown shocks Honda
WM6 Rear rim,H/D spokes stainless steel
Bridgestone Battlax Radial 150/60/18 low profile tire
Mr.Turbo boost gauge(liquid filled)
Magura clutch controls
Magura throttle assy
CB750K '77 fuel tank
Custom alum chainguard
Ltwt mirror
Allen bolts replacing screws
More coming,it will run in the 10's....and maybe high 9's one day!
Sam Green,you gotta come back to ride it!!!!!!
Frank,we'll be in touch,I'll need lot's mo help!!
Thanks to all who inspired or helped in anyway.
One chapter closes ,another opens!
Grasshopper off to work on 750's!!!!!!!!!!!!!!!!!!!! Bill
Not Purple Haze,Calendar Girl's Friday pass,but has Frank,whose always available!!!!

Went to get a tag...PRPLHZ available? NO? What? How 'bout PRPLRN? Available,K,I'll take it!! So back to PURPLE RAIN,tag on the way,and now have a registration that says 1972 CB750K with correct #'s!
Pays to know the ladies @ tag office! Bill

[dragracer]

Need a hotter spark with that turbo. MSD or Dyna SP4000. Damn, did i say use Dyna???

[NitroHunter]

Bill is that yours?
Nice looking ride!
Is that a B-25 unit? It spools plenty quick, and flows enough cfm to put you into the 9's, good luck.
I had a Dyna III for a long time before I got the Mallory mag. The Dyna throws a great spark with a big plug gap with those orange coils.
You didn't say what rods are in this motor, so repeat after me: I NEED AN AIR SHIFTER. DON'T SCRIMP ON THE FUEL. DON'T RATTLE THE MOTOR.
You know this already, so I can tell you from first-hand experience that yes those old RC Eng catalogs were correct, stock rods are the weakest link in these motors when your turbo tune-up gets stout (or stupid), they tend to become little 'S' shaped garage ornaments.
You didn't say which fuel pump you have, and you might want to ditch that wimpy low-flow fuel filter... once that boost goes up so does the fuel volume required, and a pingle petcock won't cut it when you start making the hp to run deep into the 10's or running over 140mph. It takes manifold psi to get the flow numbers you need for that arm-streatching power!
Lean gets MEAN in a hurry, it has a way of creating 100% leak down. 
At least it did with mine.     
You might check the wastegate valve seat seal too, those old square units are well, old.
AND WTF is up with those white leathers??? 007 James Bond is a member here??? 

[Tintop]

subscribed, this looks like more fun coming from the bat cave.

[NitroHunter]

Holy Turbo Batman, more boost!

[jweeks]

Now if we only could get you to look at the tach!

                                              Hondamatic

[Bill/BentON Racing]

Nitro,mine now!!! Forgot,has MTC rods!Yes to airshifter and any and all advice.Pretty newb with turbo's!So OK to offer advice,PM me,whatever,I appreciate the interest and help.Yes Jon will be looking next time! Stay tuned! Bill

[BLUE71TURBO]

 What fuel pump is being used ?  What size carburetor is being used ?  A Mikuni hsr 42 mm would be the best choice imo.   

[Bill/BentON Racing]

   .Things to find out! I'm on it! Want to ride this afternoon.Sold Roto-Faze mag/dist to Greggo! Pretty neat piece,would have probably kept if I didn't have a RC dist set-up!Bill

[madmtnmotors]

I definitely prefer Purple Haze over Purple Rain. Looking forward to following its progress!

[MRieck]

Need a hotter spark with that turbo. MSD or Dyna SP4000. Damn, did i say use Dyna???

One of the best mods I've found to help in that area is to run a seperate relay from the the starter solenoid to the coils....you get a full 12 volts to the coils. It does make a difference...I have done it to my FJ and CB. Easy to do too.

[Leino]

Excuse me, while I kiss the sky 
Nice bike Bill!

[MRieck]

Bill is that yours?
Nice looking ride!
Is that a B-25 unit? It spools plenty quick, and flows enough cfm to put you into the 9's, good luck.
I had a Dyna III for a long time before I got the Mallory mag. The Dyna throws a great spark with a big plug gap with those orange coils.
You didn't say what rods are in this motor, so repeat after me: I NEED AN AIR SHIFTER. DON'T SCRIMP ON THE FUEL. DON'T RATTLE THE MOTOR.
You know this already, so I can tell you from first-hand experience that yes those old RC Eng catalogs were correct, stock rods are the weakest link in these motors when your turbo tune-up gets stout (or stupid), they tend to become little 'S' shaped garage ornaments.
You didn't say which fuel pump you have, and you might want to ditch that wimpy low-flow fuel filter... once that boost goes up so does the fuel volume required, and a pingle petcock won't cut it when you start making the hp to run deep into the 10's or running over 140mph. It takes manifold psi to get the flow numbers you need for that arm-streatching power!
Lean gets MEAN in a hurry, it has a way of creating 100% leak down. 
At least it did with mine.     
You might check the wastegate valve seat seal too, those old square units are well, old.
AND WTF is up with those white leathers??? 007 James Bond is a member here??? 

[dragracer]

With todays ignition systems, a mag is obsolete and cumbersome to say the least. Often times one set up incorrectly will make you want to stop racing. Big Jim picked the very best system for the money when he put that MSD MC4 on his turbo. Lots of features to make a turbo live a long time.  There are other high end systems but the MSD is the best bang for the buck. Bill might want to look into one of these if he plans to race the bike. It'll save parts and maybe even his life.

[Leino]

I've been thinking of going for the MSD but with my current income not sure when... The other one I'm thinking about is Ignitech.

[Bill/BentON Racing]

I agree,MC-4 first choice,but theres a Dyna 2000 sitting there supposedly all ready to go! Might try it?
I can't race 3 bikes,probably going to race Samauto and Purple Haze!!! Make Calendar Girl regular street ride(air shifter to Turbo) and tether kill,make Samauto pts bike and $$ seeker and Turbo for fun passes...something like that! Bill
Remounted tach w/proper bracket,been installing allenheads and new hardware,Rode it to fuel up,felt good,f wheel out of round or bent,probably match f to r from Buchannons along w/H/D stainless spokes.Plenty to do ,but I'm glad I was able to pull the trigger on this one!!! Bill

[MondayLSR]

Very cool!  I want to see some dyno numbers!

[dragracer]

We need a "LIKE" button on this forum!!!!

[Bill/BentON Racing]

  Turbo model # 377 B25! Bill

[Bill/BentON Racing]

Dyno Run huh? Might be a while for me......but in 1993 @ Cabbage Patch in Daytona,it put down 102 RWHP @ 155mph!!!!! 20 years ago! WOW!!!!! Bill

[Bill/BentON Racing]

Went to tag office,PRPLHZ not available,but PRPLRN was so back to Purple Rain! Tag on the way!!!
been working on it ,more later tonight. Bill

[Sam Green Racing]

way too cool Billy. 

Sam.

[scunny]

somewhere in my stash of photos is a purple turbo 750 from about 1974ish, all psychadelic paint, will post when I find it.
carry on the good work

[Sam Green Racing]

Went to tag office,PRPLHZ not available,but PRPLRN was so back to Purple Rain! Tag on the way!!!
been working on it ,more later tonight. Bill

I wanted a personalized registration but in the UK they are very expensive so I came up with a cheap way out by having my name changed by deed poll. My new name is Melonine Rexem to go with my registration plate which is ML09RXM.  Simples.

[MRieck]

Went to tag office,PRPLHZ not available,but PRPLRN was so back to Purple Rain! Tag on the way!!!
been working on it ,more later tonight. Bill

You have to much spare time on your hands Bill