RH6 Head

P

pierodn

Joined

Nov 10, 2012

Messages

3,154

• Jan 7, 2016

• #1

Hi All.
What Commando 750 mounted the RH6 Head that has the 32 ports?
Thank you.
Ciao
Piero

 

acotrel

Joined

Jun 30, 2012

Messages

14,890

• Jan 7, 2016

• #2

If that was the Combat, it might be the reason for reduced mid-range torque rather than the cam ?

 

P

pete.v

Joined

Oct 31, 2009

Messages

5,193

• Jan 7, 2016

• #3

The RH6 came out in 73 and offered a semi high compression option. They seem to be a bit rare and desirable.

RH3 was on the Combat. Stay away.

 

S

Stephen Hill

Joined

Oct 28, 2009

Messages

1,459

• Jan 7, 2016

• #4

This might help: http://atlanticgreen.com/nhth.htm

Stephen Hill

 

ILLF8ED

Joined

Dec 30, 2003

Messages

3,701

• Jan 7, 2016

• #5

This was my '73 750 MkV. It has the RH6 head. That year two heads were used, RH5 and RH6. This is not a combat as it used the standard Commando camshaft, but the RH6 head was rated something like 9.5:1 compression.

 

lcrken

VIP MEMBER

Joined

Mar 15, 2009

Messages

5,063

• Jan 7, 2016

• #6

RH5 was specified as 9.0 CR, and RH6 as 9.5.

Ken

 

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Paddy_SP

Joined

Oct 26, 2015

Messages

221

• Jan 7, 2016

• #7

My Norton sprint-hillclimber had an RH6 head - it went like hell!