Cam re-profiling

[Trip981]

Evening all,

I’m hoping for some recommendations.

I’d like a pair of sf 6c cams re-profiling to 5c spec and coated. Does anyone know of a company or individual in the Uk that can do this?

Many thanks Steve

 

[corsaro]

you could try Newman cams they quoted for repair of my alpino cam

 

[IAG]

Thread 'Laverda 750 camshaft'

Dec 12, 2025

1 set : 5-1 cams
In good condition
Price: 125 Euro.

Br
Peder Heise

• sfc vintage
• Replies: 1
• Forum: For Sale

 

[Jota Rob]

Would also recommend Newman. They did some Vincent followers for me about 20 years ago. No drama then.

 

[Ernesto]

I’d like a pair of sf 6c cams re-profiling to 5c spec and coated.

Could that even be possible? I can see that the shape of the cams
could be modified to match the 5C shape.
But they have different timings.
5C:
In 42/74
Ex 64/52
6C:
In 62/88
Ex 87/67
Like I understand this you'd have to cut the camshafts and
weld them together in a different position to get 5Cs.

Ernesto

 

[Trip981]

Could that even be possible? I can see that the shape of the cams
could be modified to match the 5C shape.
But they have different timings.
5C:
In 42/74
Ex 64/52
6C:
In 62/88
Ex 87/67
Like I understand this you'd have to cut the camshafts and
weld them together in a different position to get 5Cs.

Ernesto

I thought standard SF 5/1 cams were In 42/74 and Ex 64/52 and 5C cams were In 52/78 and Ex 78/47?

5C

 

[Ernesto]

Yes, you're right.
Picked the wrong line.
But that doesn't match the 6C timing, too.

 

[RGS1000RGS]

Joy Cams reprofiled a cam from a standard cam to a Yoshimura cam profile that I'd supplied for him to copy. It took a while for it to be done, as they are usually busy as they do a lot of work for racing teams, but their work is spot on.

https://www.motorcyclewebsite.com/item/joy-engineering-camshaft-specialist/

 

[Paul Marx]

It might be cheaper to buy a 5C.
Paul

 

[piranha-bro2]

The 6/C is 'broader' than the 5/C so you could theoretically have the 6 reduced to a 5 profile, but then it would need to be nitrided for hardening (definitely not coated!). I tend to agree with Paul that buying a 5/C might be more expedient - and sell the 6/C if you'll never use it.

5/C not to be confused with the SF1 5/1.

 

[sfcpiet]

Could that even be possible? I can see that the shape of the cams
could be modified to match the 5C shape.
But they have different timings.
5C:
In 42/74
Ex 64/52
6C:
In 62/88
Ex 87/67
Like I understand this you'd have to cut the camshafts and
weld them together in a different position to get 5Cs.

Ernesto

Nothing that a layer of weld can't fix.

I once had a rusty old "S" cam for a 100 repaired with laser welding, to fill the deep rust pits mainly, one lobe was half-gone. Weld was rated at 65HRC, plenty hard to cope without further heat treatment. Re-profiled the lobes myself, not so dramatic on a single, worked just fine!

piet

 

[Tippie]

Agree it would be better to source a 5C and sell the 6C to someone to use on the track, a shame to "wreck" it.