Engine exchange

[Potash123 26]

My old Hayterette engine has give up the ghost. I have a Sovereign self drive with a 375 B & S engine. Will the engines inter-change. What thread are these B & S engines as in the ancillary parts, who supplies them ? Many thanks. 

[nigel 1,877]

Should drop strait on mate

[Potash123 26]

Thanks Nigel. Does anyone know about the threads please.

[nigel 1,877]

Use the same bolts ian

[Potash123 26]

Hi Nigel. I am trying to establish the threads used by B & S in general. I have boxes of new BSA, Enfield, AJS and Metric bolts, but nothing seems to fit these mowers. I appreciate the replies.

[wurzel 117]

Briggs and stratton use AF threads

[nigel 1,877]

Yep like wurzel says AF

[Anglo Traction 1,016]

Yep AF imperial spanner sizes and UNC UNF Thread forms

[Potash123 26]

Thanks lads. Well I got the Hayterette up on my bench today. I undid the bolt holding the blade disc and it freed up well ( Lucky me ). Engine out of the ally body and stored. Took the engine out of the Sovereign, removed the drive pully and it slotted in a treat. Could not believe how well it went. As the new engine is so good I am going to bare metal respray the body and respray the motor. the wheels will go in the dishwasher when the wife is out ( they are plastic rims ). Just need to sort out the modern lever to shut the engine down on the handlebars via the cable. Any advice would help on that one.  Sorry can't do photos. Hope to give this a new lease of life.

Then I am going to restore a Hayter 21 just for fun. Regards Potash.