Now I'm rebuilding one

**F5 Dave** · 9th July 2012, 09:53

its a 2 stroke, keep that manifold short. I think you will find it fast enough, but there is one better way that involves some serious machining & a single reedblock mounted vertically.

Either way if you can get the crank safe to pull some revs it will be a weapon.

**F5 Dave** · 9th July 2012, 09:55

Originally Posted by Ocean1

Make a split manifold symmetrical about a horizontal centreline, (top and bottom carb ports).

Run a single 24mm carb on one port, nothing at all on the other.

You'll need a special size main jet and a very very skinny needle.

various restrictor classes have engineered an air 'leak'. I think on a 2 stroke you are inviting more seizures than one might wish on an enemy.

**jasonu** · 9th July 2012, 10:46

Originally Posted by Drew

To catch anyone who wasn't watching my last thread toward the end, after discovering my failure with the DT AJ kindly donated his GT125 to me. Which I shot up to Himatangi and picked up yesterday. Cheers AJ, you're an absolute star!

Thoughts?

Can you hold your breath the whole time while driving over the Himatangi bridge??? I can

**jasonu** · 9th July 2012, 10:55

Originally Posted by F5 Dave

various restrictor classes have engineered an air 'leak'. I think on a 2 stroke you are inviting more seizures than one might wish on an enemy.

Big mouth. I was hopeing someone would try it and post up the results...

**TZ350** · 9th July 2012, 12:12

Originally Posted by Drew

keeping enough gas in the bowl.

I don't think the fuel will be a problem.

Originally Posted by Drew

if there's a pulse timing clash

Not sure about that one myself, it could help or hinder, maybe both but at different rpm.

**F5 Dave** · 9th July 2012, 13:13

Originally Posted by Drew

. . and keeping enough gas in the bowl.

Actually I'm with him on this one. Can be a problem with some smaller carbs.

**ief** · 9th July 2012, 13:27

Some yamaha banshee's riders use a single carb for 2 180 degree firing cylinders and they win bottom end and loose top end.

**Drew** · 9th July 2012, 17:09

Well, the motor is mounted, hardest bit was getting it high enough so that the chain wouldn't foul the swing arm. Who the fuck thought that the out put shaft sitting in front of the input shaft is a good idea? Shame on whoever didn't understand that the chain now needs to be slacker than it could have been!

Fills the hole a shot load better than the dt did though, looks quite neat. Post pics later.

Just pipes to make and we're away laughing! That's inlet and exhaust pipes. Got a book on two strokes from Bryce to figure out what the fuck I'm doing on the zorst front.

Oh yeah, I also took some time out of my day and mounted a 17 inch rear wheel. Anyone got a standard rear brake caliper for what I think is an Fxr?

**Ocean1** · 9th July 2012, 17:45

Originally Posted by F5 Dave

various restrictor classes have engineered an air 'leak'. I think on a 2 stroke you are inviting more seizures than one might wish on an enemy.

Yeah.

Probably better to run carbs on both ports, but no fuel to one...

There will be a way to get the right twice the fuel through one carb, but you're right, the place to discover that is on a flow bench.

**Bert** · 9th July 2012, 18:24

Originally Posted by F5 Dave

its a 2 stroke, keep that manifold short. I think you will find it fast enough, but there is one better way that involves some serious machining & a single reedblock mounted vert......

I had a long think about that last time you posted this idea. A vortex reed block might be the answer. It could enable two reeds per intake and solid core between them. Would you have to seel off between intakes or leave them to ballance? Might be slightly easier to make???

Or just sleeve it down to 100cc watercool it and not have the issue!

**Drew** · 9th July 2012, 18:33

The motor is piston and reed ported, so would be shit loads of fucking around for either of those ideas.

**crazy man** · 9th July 2012, 18:49

a\

Originally Posted by Bert

I had a long think about that last time you posted this idea. A vortex reed block might be the answer. It could enable two reeds per intake and solid core between them. Would you have to seel off between intakes or leave them to ballance? Might be slightly easier to make???

Or just sleeve it down to 100cc watercool it and not have the issue!

only l can have a hundy twin