What in the world is this?

[FastCletus]

The headline said 1980 Cb 750/900???
I looked at bike found out it was 750 (by 748 cc on engine)
Bought forks for 1980 Cb 750, Forks too small ( I have 37mm forks)
researched it and thought I had an 81 CB 750 F My bike has 2 front rotors not one. So I thought correct.
Just found out from Title research off of engine and frame # and paper says 1979.  
Is there a such thing as a 79 CB 750 F with 37 mm forks and dual front rotors, and rear disc???

Going to be a bitch buying parts for  a bike I don't know what model it is?

[Half-Caf]

My '80 750f has dual discs and rear disc. However, the forks are 35mm -I believe this is the fork size for all 750's.
Now I do have a 900 also, and I know at least the c model comes with 37mm forks stock.
So, I would venture to say you have a cb750 with a 900 front end.

[Piute]

FastCletus wrote

The headline said 1980 Cb 750/900???
I looked at bike found out it was 750 (by 748 cc on engine)
Bought forks for 1980 Cb 750, Forks too small ( I have 37mm forks)
researched it and thought I had an 81 CB 750 F My bike has 2 front rotors not one. So I thought correct.
Just found out from Title research off of engine and frame # and paper says 1979.  
Is there a such thing as a 79 CB 750 F with 37 mm forks and dual front rotors, and rear disc???

Going to be a bitch buying parts for  a bike I don't know what model it is?

  Some of the guy do do miracles about reading other minds ,do to the the Questions are ask,then there's "O" I already tryed that(2wks later),or It's not all original after you've hunted down the parts,


                                                 Welcome to are Lil group just like Fam.

[TOOLS1]

I have to go with fractional adolescent bovine on this. CB 750 with CB 900 forks. However does yours have two, or four studs on each leg, for the axle clamp?
TOOLS  

[FastCletus]

2 stud bolts on each fork 

Jimmy Clement

On May 5, 2012, at 2:16 PM, "TOOLS1 [via Honda CB750'S]" <[hidden email]> wrote:

I have to go with fractional adolescent bovine on this. CB 750 with CB 900 forks. However does yours have two, or four studs on each leg, for the axle clamp?
TOOLS  

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[TOOLS1]

Not a Gold Wing then. Probably a 900.
TOOLS

[FastCletus]

Tools, I think you are right.  
The forks are also air assisted.  The question now is what year they are?  I need to replace the fork oil, and not sure what weight to put in and how much per fork.  Internet says 80 has 9.8 oz and 81 has 9.5 oz.  Dumb question but is that per fork?  Do you use ATF or 5 w fork oil?

[sgtslag]

Yes, it is per fork.  Dexron III/IV/V ATF and fork oil have viscosity stability in common:  they both maintain their viscosity, very accurately, no matter the temperature, within their operating range.  You can use Dexron III/IV/V ATF, or whatever fork oil weight you choose (5-20, typically).  The ATF allegedly clocks in at 8 weight, by the way.  The higher the viscosity (the higher the number), the stiffer the fork response to bumps.

Honda used Dexron ATF because it was readily available, inexpensive (~$4/quart, today's prices), and it works.  If you go with fork oil, expect to pay around $12+/quart, buying it in specialty (MC) shops.

No matter what hydraulic fluid you put into your forks, expect to replace it every two years.  It does wear out, with use/abuse.  It is easy to do, and it helps with traction (the forks, and the shocks, help keep the rubber in contact with the road, tracking bumps, to keep the shiny side up...) -- comfort is a pleasant side-effect.  Cheers!

[TOOLS1]

Ditto what Sarg said. There is not much difference between 9.5, and 9.8. I would go with the 9.8. The .3 is not going to hurt anything.
TOOLS

[Cabreco]

I found this on another forum. Maybe this will help

HONDA
Year Make Tube Length OD ID
 75-79 GL1000 24" 37 29
 73-80 CB750 K L A C 23" 35 26
 75-79 CB750 F Supersport 23" 35 26
 69-72 CB750 K1-K2 23" 35 26
 79-80 CB650 C 23" 35 26
 75-78 CB550 F Supersport 23" 35 26
 74-78 CB550 K 23" 35 26
 78-80 CX500 C-D 23" 33 24
 75-76 CB500 K T 23" 35 26
 71-74 CB500 K1 K2 w/rods 23" 35 26
 72-74 CL-CB450 K5-6-7 w/rods 23" 35 26
 1971 CB450 K3-K4 w/disc 23" 35 26
 69-70 CB450 K2-K3-4 5speed 21" 35 26
 68-71 CL450 K2-3-4 21" 35 26
 65-68 CB450 K 4 speed 22" 33 25
 78-80 CB400 F-T-Hawk 1-11 23" 33 24
 75-77 CB400 F 23" 33 24
 79-80 CM400 A-T-E 23" 33 24
 74-77 CB360 CL-CJ 22" 33 24
 72 1/2-74 CB350-CL350 K4-F-G 22" 33 24
 68-72 CB350-CL350 K2-3 22" 33 25.4
 73-74 SL350 K2-3 23" 35 26
 70-72 SL350 K1-2 22" 33 25.4
 Thru 67 CL305 CL77 21" 35 26
 Thru 69 CB305 CB77 22" 33 25.4
 1978 XL250 25" 35 26
 75-76 MR250 23" 35 26
 Thru 67 CB250 CB72 22" 33 25.4
 Thru 69 CL250 CL72 22" 35 26
 74-76 CB200 CL200 19" 31 24
 74-75 CB175 19" 31 24
 65-73 CB175 - CL175 19" 31 24
 70-71 SL175 19" 31 24
 THRU 67 CB160 19" 31 24
 1975 Elisnore 125 25" 31 24
 


KAWASAKI
Year Make Tube Length OD ID
 77-80 KZ1000 A,B,C,Z1,LTD 24" 36 26
 73-77 KZ900 Z1,A,B,C - H2 A,B 23" 36 26
 78-79 KZ750 B3-B4 24" 36 26
 72-77 KZ750 B2,B1-H2 A,B,C 23" 36 26
 77-79 KZ650 B1,2 C1,2,3,D2 23" 36 26
 67-69 W1650 W2 21" 34 26
 72-76 KH500 A,B, H1 D,E,F 23" 36 26
 69-71 H1500 23" 34 26
 74-78 KZ400 A,D S2,3 4 stroke 23" 33 24
 74-77 KH400 A,S3,S3A, 2 stroke 23" 34 26
 73-75 S2350 23" 34 26
 1972 S2350 Mack 11 23" 34 26
 67-71 A7350 21" 32 25
 1970 350 Big Horn 23" 34 26
 1975 S1250 23" 34 26
 1966 A1250 21" 32 25.4
 

SUZUKI
Year Make Tube Length OD ID
 78-80 GS1000 ET,SN,EN,N,EC,C 24" 37 28
 1979 GS1000 LN 28" 37 28
 79-80 GS850 GLT 28" 37 28
 79-80 GS850 GT, GN 24" 37 28
 1979 GS750 LN 28" 37 28
 77-79 GS750 EN,N,E,EC,C,B 23" 35 26
 75-77 GT750 B,A,M 25" 35 26
 1974 GT750 L 23" 35 26
 72-73 GT750 J,K 25" 35 26
 79-80 GS550 LT,LN 28" 37 28
 77-80 GS550 T,ET,E,EN,N,EC,C,B 23" 35 26
 75-77 GT550 B,A,M 25" 35 26
 1974 GT550, GT550 L 25" 35 26
 72-73 GT550 J,K 23" 35 26
 75-76 RE500 A,B Rotary 23" 35 26
 76-77 GT500 A,B 25" 35 26
 68-77 GT500 R,J,K,M 23" 34 26
 1974 GT500 L 23" 34 26
 1980 GS450 LT,ST,S 23" 33 24
 1979 GS425 LN,EN,N 23" 33 24
 77-78 GS400 C,XC,B,XB 23" 33 24
 74-75 TM400 L,M 23" 34 26
 72-73 TM400 J,K 23" 34 26
 73-77 TS400 K,L,M,B 23" 34 26
 1972 TS400 J 23" 34 26
 74-77 GT380 L,M,A,B 22" 33 24
 72-73 GT380 J,K 22" 33 25.4
 1972 GT350 J 23" 34 26
 69-71 GT350 23" 34 26
 72-78 GT250 J,K,L,M,A,B,C 22" 33 25.4
 68-71 GT250 23" 34 26
 73-78 TS250 23" 34 26
 71-72 TS250 23" 34 26
 68-71 GT185 R 23" 34 26
 

YAMAHA
Year Make Tube Length OD ID
 78-79 XS1100 SF 27.25" 37 28
 79 XS1100 F,E
78-79 XS750 F,E
78-79 XS750 SF,SE 27" 36 28
 1977 XS750 D,2D 23" 36 26
 73-76 TX750 XS750 23" 36 26
 78-79 XS650 E,SE,F,2F,SF 23" 35 26
 75-77 XS650 B,C,D,2D 23" 34 24
 72-74 TX650 XS650 23" 34 24
 68-71 XS650 23" 34 26
 78-79 SR500 F,E 23" 35 26
 1979 XS500 Special 23" 35 26
 75-78 XS500 E,D,C,B TX500 23" 34 24
 73-74 TX500 A 23" 34 24
 77-79 XS400 F,2F,E,2E,D 24" 33 24
 76-77 RD400 D,C 23" 34 26
 1979 RD400 F 23" 35 26
 76-77 XS360 D,2D,C 23" 33 24
 69-75 RD350 R5350 23" 34 26
 67-68 YR350 YR1,2,3 21" 34 26
 66-69 YM305 YM1,2 23" 32 25.4
 73-75 RD250 A,B 21" 34 26
 Thru 68 YD250 YDS3 23" 32 25.4
 69-70 DS250 DS6,7 RC250 23" 34 26

[Peteroo]

Ok, a new guy here but a very similar question. I picked up a basket case  1980 cb750. think its a 750F from a  RC04 stamped on the frame, but it has a 900 engine in it. My question is it has 39mm fork tubes on it with dual discs and two bolt axle caps and it looks like the rotors are about 11inches. Anyone have ideas on what this could be from? im thinking a cb1000c???

[cdaiscool]

Pictures?

[Peteroo]