The Bucket Foundry

[Frits Overmars]

Pull start total weight is the same as YZ 250 kick start leaver on it's own.

Man, you need a better camera. It seems that new Samsung Note 7 smartphones can be had for little money
How about starting effort? Does it need more jerks than kicks?

[Hemi Makutu]

Me too, I've been pondering over a modern triple myself. Every time I get enthusiastic I remember all the unfinished projects
But In saying that I do have an interested party that want's one (as well as me) so the design process continues. First it was going to be a 1050cc three using my own cylinders off the 700 twin gyro engine, but then it got down graded to a 700 twin (with a balance shaft). BUT now it's down graded again to 480 three. I'm building a 160cc (58 x 58 ) cylinder to suit this bottom end bolted in the YZ250 frame, with just standard, modern, port arrangement (two versions, one a bridged port and one a single with eye ports). So three times 160 cylinders but in a line? Firing the two outside cylinders together and the middle one 180 degrees later, (better for mechanical balance) or turn it into a V?
I'm keen on the three in line as it will be easier to make, center cylinder pointing backwards, water cooled cases, possible EFI too.
But this is all just dream land at the moment.
You know I do have these patterns here for a rotary valve 700 tandem twin engine (ex gyro engine ), can't help day dreaming about that as a street bike. Thin and lite, goobs of power
Might be 153cc, not 160cc opps.

A cast block Kawasaki KR 750 triple:
http://kawasakitriples.myfastforum.o...bout10413.html

Ok not new, & not even reed valve, let alone power valve, but a bit of thought seems to have been
put into aligning the transfers for decent area, which was one of the H2 750 roadbike/H2R F750 racebike shortfalls.

Incidentally, having read the head casting posts, I note that a German bloke is making new-cast replacements
for the crack-prone H2, with current tech combustion chamber design reportedly worth +!0% power as a bolt on.

[Flettner]

How about starting effort? Does it need more jerks than kicks?

Haven't started it yet but the pull start works well, it will start. I wouldn't want to be trying to start it with a weak ignition though. I think everything is in place to hammer it out this weekend and get some sort of (running round the yard) result.

Got a Robin engine starter, got it home and realized it turned the engine backwards. Bugger, but with some careful redesigning and flipping some parts over it works fine now, there is always a way.

[Hemi Makutu]

Seems those pull-starts for bikes are 'the new black'..

http://www.bikebound.com/2016/10/17/gatto-nero/

[mr bucketracer]

A cast block Kawasaki KR 750 triple:
http://kawasakitriples.myfastforum.o...bout10413.html

Ok not new, & not even reed valve, let alone power valve, but a bit of thought seems to have been
put into aligning the transfers for decent area, which was one of the H2 750 roadbike/H2R F750 racebike shortfalls.

Incidentally, having read the head casting posts, I note that a German bloke is making new-cast replacements
for the crack-prone H2, with current tech combustion chamber design reportedly worth +!0% power as a bolt on.

thats a nice peice of work !

[Hemi Makutu]

This bloke makes some nice stuff, but seems a tad pricey: https://sso-bikes.de/shop

( & suppose you could cover those Kawasaki engine rattles by that bloody Ducati dry clutch racket)

[Hemi Makutu]

This article from ' Flight' ~ 60 years ago, discusses merits of injection tech on a large SV aero-engine.

http://www.flightglobal.com/pdfarchi...0-%201630.html

( & aren't those lovely 'organic' look exhaust manifolds a real work of the engineer's art!)

[ken seeber]

After a lot of distractions, am able to now get back into it. Have to flare (well more of a long taper, bit of a compromise I know Frits) the pipes a bit in the straight exit length, then do the cones. The final system will be 3 vertical ups, with the tailpipes bent so they are horizontal, all facing in the same direction. This means the actual chamber sections can just be straight. During the wait for the laser cut blanks, can get back into the dyno restoration.

[husaberg]

After a lot of distractions, am able to now get back into it. Have to flare (well more of a long taper, bit of a compromise I know Frits) the pipes a bit in the straight exit length, then do the cones. The final system will be 3 vertical ups, with the tailpipes bent so they are horizontal, all facing in the same direction. This means the actual chamber sections can just be straight. During the wait for the laser cut blanks, can get back into the dyno restoration.

The El Toros.

[ken seeber]

Close Hooser, but not close enough. Your little bull has only 2 horns, unless......

[Frits Overmars]

Close Hooser, but not close enough. Your little bull has only 2 horns, unless......

After 68 years I finally realize where the english expression horny comes from

[ken seeber]

After 68 years I finally realize where the english expression horny comes from

Hahaha, very good Frits. It just shows that you young fellers still have a bit to learn. Give it a couple more years and you’ll be there.

[Flettner]

It lives again. I've been around the yard on it now, timing is retarded and it's as rich as hell but it goes under it's own steam. Tick, done, throw it in the corner. Next project.

[Hemi Makutu]

Splendid effort F, stay on it!

(& by "timing is retarded..." do you mean ignition, or valve?)

[Grumph]

It lives again. I've been around the yard on it now, timing is retarded and it's as rich as hell but it goes under it's own steam. Tick, done, throw it in the corner. Next project.

Well done. Now give it to someone to develop....and get on with the next project.