[RE_Chief]

I have a couple of motors that I could donate to a Bullet frame, a '58 Trailblazer and a '64 Mk1 Interceptor. 

I am wondering which would be the better motor for the Bullet frame.  Obviously the 700 would be a little more in keeping but I wonder if there are an issues with putting the bigger motor in.  The Mk1 has the bracket that was meant to strengthen the frame.  Apart from the cross-rings, 'R' cams, and bigger bore size, are there any other intrinsic differences between the motors?

What if I made it electric start as well?

Regards Charles

[Blltrdr]

I think you could go with either motor. 

I pretty sure you will need to use the Bullet trans with the twin.

You should be able to do a search on this site and find some info. Do recall a few of these builds on the forum.

[Bullet Whisperer]

I think you could go with either motor. 

I pretty sure you will need to use the Bullet trans with the twin.

In standard form, the twins have a longer gearbox mainshaft because the clutch is over to the left by about 9/16" more than on the Bullets, due to the twin engines being wider than them 
 B.W.

[Mr.Mazza]

I did some research on this and found very little work needed to the frame, a top bracket needs welded in, and maybe wider swingarm.

[RE_Chief]

Just sourced an Interceptor Mk 2 motor.  Now I am wondering whether this might be a better option to go in the Bullet frame?  Hmmm, too many choices.  What do others think?

Regards Charles

[High On Octane]

I honestly don't think it matters much.  You can hardly the differences between the frames and only a true collector could tell the difference.

[da punds]

Hi is it an indian/early frame, or a post 56 cradle type ?. I ask because of clearance around the top of the engine, when I was messing around in the workshop a few weeks back there doesn't appear to be enough clearance for the Interceptor engines in the Indian/early frames so this would suit a Trailblazer better. If on the other hand it is a late Reditch frame, I would be careful as the shorter wheelbase could make the bike very twitchy, you could use a later Interceptor swing arm which is longer to steady things. The extra brackets on the rear of the gearbox are supposed to fit all frames so this shouldn't be a problem. Just my thoughts, it should be a straightforward build using over the counter parts.