1974 cb350 front end swap

[rupaulpierce]

no real reason here other than opportunity... both options are available locally.

1981 cm400 tubes (same fork tube diameter)

1984 cb650sc front end (Larger diameter tubes, dual disc, same steering stem bearing size)

is the brake set up on either of these options worth the effort?

 

[VonYinzer]

Re: 1974 b350 front end swap

I'm assuming you mean "Cb350".

The 650 forks would be an upgrade with the dual disk and beefier tubes. You'll need the front wheel as well. Before you swap you'll need to determine the length of the forks to make sure they're not too long. Cb350 forks are pretty short. Also, what is the difference in rake between the 350 and 650? How much of that number is frame and how much is triple tree?

 

[rupaulpierce]

Re: 1974 b350 front end swap

I'm assuming you mean "Cb350".

The 650 forks would be an upgrade with the dual disk and beefier tubes. You'll need the front wheel as well. Before you swap you'll need to determine the length of the forks to make sure they're not too long. Cb350 forks are pretty short. Also, what is the difference in rake between the 350 and 650? How much of that number is frame and how much is triple tree?

all questions i'm going to need to answer

 

[rupaulpierce]

Found this info google cached in another forum, just putting it out there:

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

 

[rupaulpierce]

Not gonna work, the 84 cb650sc has a model specific triple tree. People are suggesting using cb750/900 triples with the cb650sc 37mm tubes/wheel/dual brake, but those triples have a different stem bearing.

 

[grcamna5]

Not gonna work, the 84 cb650sc has a model specific triple tree. People are suggesting using cb750/900 triples with the cb650sc 37mm tubes/wheel/dual brake, but those triples have a different stem bearing.

Thanks for posting that list of different fork diameters rupaulpierce

 

[rupaulpierce]

Thanks for posting that list of different fork diameters rupaulpierce

this is LENGTHS and diameters, the outer diameter list is on this forum and widely available elsewhere. took me a while to dig up this list of lengths.

 

[clem]

That 650 has a leading front axle also.

 

[runmikeyrun]

I picked up the front end from a cb500t and the forks are 2mm larger and 1" longer. I need to use the 500's triple tree but all balls makes a bearing set that allows that triple tree to fit into the 350 frame. Might be an easier swap for you.

If you are interested in the dual front disc the info is out there. It used to be on a website but that site is down, search for cb750 dual disc conversion. I'm still on the fence if the extra weight it really worth it. You can use the hub from the 500t and you'll have to use those discs as well, because among other reasons the 350 hub/disc is 4 bolts and the 500/750 are 6.