The Old Lawnmower Club
Collection, Preservation and Display of Old Lawn Mowers
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30 degree valve seat cutter

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Mowing Wurzel Sat, 09/09/2023

When I leave an engine, knowing I'm not going to start it for a while,  I always squirt oil in the plug hole and close the valves.

Sadly not all people do this.

I need to purchase a valve seat cutter for doing BSA F & G engines; trouble is most kits don't seem to have a 30 degree cutter.

 

valve seats

Forums

wristpin Mon, 11/09/2023

The Neway set sold under a B&S number contained 45 and 30 degree cutters as the old 5 Hp 13series side valve lumps had a 30 degree inlet, so older BS dealers have probably got one. I presume that you know for certain that those valves are 30 degrees ?

Mowing Wurzel Mon, 11/09/2023

Thank you,  I'll investigate  Neway tools,  yes certainly 30 degree seat as advised in the manual and when I put angle measure on a new valve.

I note cutter diameter needs to be just over 30mm.

Will let you know how I get on.

 

valve seats

wristpin Tue, 12/09/2023

30 degree (31) cutter and valve from my set .


 


 

45 (46) degree  cutter

  

45 and 30 degree valves

Three angle valve valve seats.

The valve seat will often involve three angles. Starting with 30 degrees, then 45 degrees , the contact area, then 60 degrees under the contact area.

 

 

 

 

 

Mowing Wurzel Tue, 12/09/2023

Thank you,

If I cannot purchase a valve seat cutter

I may have to book a day off work and take my cylinder  barrels  to an Engine Recon. Co.  Then after several weeks collect.

Sadly Engine Reconditioners do not open on the weekends!

Plus I Cannot find any UK distributors for Neway. 

I started this job in May, (or was it earlier????) and have not made much progress due to work, house chores, gardening, motor car maintenance, plus a few short holidays!

barrel

wristpin Wed, 13/09/2023

Neway used to be distributed in the UK by Sykes Pickavant , but it appears no longer so. Sealey appears  to offer similar kits.  Rather than go to a general engine reconditioner it may be worth seeking out a vintage motorcycle engine shop.

Mowing Wurzel Mon, 25/09/2023

I bought a second hand Pikavant valve cutter set off the internet, very pleased with it.

Just had a test go at one of the exhaust seats.  Very pleased, a few more turns as there is a grey spot, then lap in with paste.

barrel2