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B6ES or B7HS spark plug for 1955 G2 350 Bullet
Posted: Mon Jun 17, 2019 2:27 pm
by Cov Lad
The previous owner was running this bike on a B6ES. I bought a new plug from hitchcocks - they gave me a B7HS for this bike. I'm not sure what to go with out of the two? Can anyone please advise?
Re: B6ES or B7HS spark plug for 1955 G2 350 Bullet
Posted: Mon Jun 17, 2019 2:40 pm
by Rushour
Redditch 350 Bullets all had short reach plugs so our hosts are correct, I am surprised the long reach plug did not damage the valves or piston - lucky escape there.
Re: B6ES or B7HS spark plug for 1955 G2 350 Bullet
Posted: Mon Jun 17, 2019 3:09 pm
by Cov Lad
The previous owner was adamant that a long reach was correct for the bike, it has not really run that well since I bought it. I am really confused now. I have put the short reach in but no response kicking it over with tappets adjusted.
Re: B6ES or B7HS spark plug for 1955 G2 350 Bullet
Posted: Mon Jun 17, 2019 3:31 pm
by Cov Lad
As the barrel has had a plug thread insert it now takes a long reach plug.
Re: B6ES or B7HS spark plug for 1955 G2 350 Bullet
Posted: Mon Jun 17, 2019 4:08 pm
by Rushour
Something very dodgy going on here - if its a short reach plug - you replace the insert with a 1/2" one - not 3/4" ( long reach ) - basic engineering,
Re: B6ES or B7HS spark plug for 1955 G2 350 Bullet
Posted: Mon Jun 17, 2019 5:23 pm
by Beezabryan
Alloy head = 3/4" reach plug
Iron head = 1/2" reach plug
So Cov Lad what do you have?
Re: B6ES or B7HS spark plug for 1955 G2 350 Bullet
Posted: Mon Jun 17, 2019 7:15 pm
by Cov Lad
I'm pretty sure that the barrel is iron and the head alloy.
Re: B6ES or B7HS spark plug for 1955 G2 350 Bullet
Posted: Tue Jun 18, 2019 8:26 am
by Rushour
To the best of my knowledge - I have never seen a 350 cc Bullet - either iron or alloy - that took a long reach plug .
Re: B6ES or B7HS spark plug for 1955 G2 350 Bullet
Posted: Tue Jun 18, 2019 9:34 am
by Presto
All 350 Bullets take a short reach 1/2 inch plug. Using other than 1/2 reach could easily create problems.
(Only exceptions will be 'user' modified heads to take a different reach plug).
See page 94 in host's catalogue for confirmation.