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10E 250 conversion

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10E 250 conversion

Post  FBKev on Fri Aug 10, 2018 3:37 pm

When I got the Falcon 81 along with the Captain, the previous owner also supplied two 31a barrels & one head (now have a 32a head as well) one is rebored with a new +60" piston and the other needs to go to Villiers services to see if it will take one their +100" pistons (pitting/water damage around the TDC area) I know these engines shared the bottom end, and they both had the same S25/2 carb so is just a matter of using the 31a jetting? has anyone here done this? is there anything I should look out for. One more thing (going to do the falcon 1st) can the barrel be removed with the engine in situ?
TIA Kev.
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FBKev

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31A from 9E

Post  piston 197 on Fri Aug 10, 2018 4:01 pm

Yes you should be able to do the barrel swap with the engine in situ, the tank will have to come off, but that is about all.
The 9E/10E uses a 120 main jet and the 31A uses a 130 other than that there should be no changes necessary.
The 31A barrel has a flange the same thickness as the 9E/10E as both use 5 1/4" long conrod, so just check they are 31A and not 32A which is 1/4" longer as it uses the 5 1/2" long conrod, if the barrel is indeed a 31A it will be the same length as the 197cc barrel and it will be a straight swap
JH
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Re: 10E 250 conversion

Post  FBKev on Fri Aug 10, 2018 4:38 pm

Yes JH definitely a 31a short rod barrel. Bob the previous owner is into historic karting know's his Villiers inside out.
Kev
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Re: 10E 250 conversion

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