RT-2MX/YZ360A Hybrid

[Freakshow]

YZB went back to steel pins and have seen some A with the steel too but most are the ally.

I have a GYT piston port barrell and from what i can tell the hole thing is cast around a steel insert which includes all the ports, transfers and so on, so you cant just sleeve it, unless it was bore to take a steel inside steel simple liner. 

ITS basically a complete barrell but with ally fins cast over it..... its only yammy can i have seen like it ( but then i dont get out much )

[Iain Cameron]

My RT1MX is a iron cylinder 2mm over . Its the only RT\DT 1 mx part I own . Iain

[firko]

YZB went back to steel pins and have seen some A with the steel too but most are the ally.

What do you mean by steel pins Freaky?

[Tahitian_Red]

He means the stem. 

That thingy that the steering head bearings go on. 

[farmpro]

The steering stems on the YZA's here in the US were aluminum and bent fairly easily by most fast pro's.They were usually replaced by steel ones from DT/RT2MX's or MX250/360's or SC500's.They were press fit.

[firko]

What do you mean by steel pins Freaky?

Yeah, it makes sense now.. from time to time I have a bit of trouble with Freak Speak

[Freakshow]

NO probs.

[OverTheHill]

Yeah, steering stems--God i remember my Elsinore CR250M ended up bending the steering stem from landing hard on jumps. Put a dogs leg in it after a lot of use so turned it half a turn & it slowly did it again so made a stem out of an old Yamy Landscout fork leg. Practiced my thread cutting till i got it right [didn't really know what i was doing but]. Think that was the one that i was trying suspension tricks on & moved the shocks forward plus had shorter ordinary oil girlings forward of that again to assist the piss poor damping of the main ones--did work ok as a stop gap measure till gas girlings came along. They lasted ok in the vertical position but didn't like being cantered forward too far or gave up pretty quick. Where i worked we were the NZ agent for Girlings & had truck loads of them. Got a pair on one of my relics that i put yamy gas valves in so i could change the oil & experiment & just gassed up with the compressor via a needle to 120psi [not ideal i know but nothing exploded--yet]. Anyway, where was i--lost.

[Tahitian_Red]

Here are some pics of the YZ-A stem for comparison





The top clamp is different also (smaller hole)

[Tahitian_Red]

I weighed the triple clamps I was going to use vs. the YZ-A set and there is over a 1 pound savings.  Adding up the weight savings with the items I have, my RT2MX Hybrid should be in the 210-212lb range. 

Not sub-200 like Barry Watkins' effort, but pretty good for starting with a 238lb pig.  I'm foregoing the Ti axles and engine internals lightening to hold costs down.

[firko]

I'm aiming at the magic 200lb make with my RT2MX Jay but I'm at an advantage with the Chro-mo Hindall frame. I'm using mag Profab triple clamps, Can-Am back wheel, alloy YZ125-A tank, alloy seat base and little things like 'some' ti bolts, titanium Jones handlebars and hollow Chro-mo axles and swingarm pivot that came with the frame. I've changed the plans for my other almost identical Hindall and it'll get the hybrid DT2MX engine with YZ-A top end.
                                                                   

[Tahitian_Red]

Firko,

It should be a very cool bike!  I'll post a Harry Hindall article I have.  He looks like he could step out of the pages and be some cool dude walking down the street today.  Is he still alive?

On a side note what ever happened with the McCook Racing website?

[firko]

Firko,
It should be a very cool bike!  I'll post a Harry Hindall article I have.  He looks like he could step out of the pages and be some cool dude walking down the street today.  Is he still alive?
On a side note what ever happened with the McCook Racing website?

McCook only recently pulled the website after a year or two of inactivity. He's dropped out of the sport because of business taking up much of his time...he runs a big multi national electrical components company...and most of all, a racing back injury prevernting him from riding any more. He and I are still good mates, in fact he's going to stay at Casa del Firko over Christmas/New Year while down here for the holidays. He's selling up a lot of his stuff but is keeping his street trackers and café racers. The YZ125-A tank for my Hindall is from his stash.

Harry Hindall was indeed a cool dude with his beatnik goatee and polo neck sweaters. I'm a bit of a student of aftermarket frame maker welding and I reckon Harry's bronze welding to be the best I've seen except for Mark Jannink from Mojo frames in England http://www.mojomotorbikes.co.uk/home.html who's in a class of his own. Harry Hindall took his own life at a shooting range in New Mexico back in '02 or so.

[jerry]

Hey Marcos you should chase up old mate Ji for some up to the minute Titanium info. J

[yamaico]

I'm aiming at the magic 200lb make with my RT2MX Jay but I'm at an advantage with the Chro-mo Hindall frame. I'm using mag Profab triple clamps, Can-Am back wheel, alloy YZ125-A tank, alloy seat base and little things like 'some' ti bolts, titanium Jones handlebars and hollow Chro-mo axles and swingarm pivot that came with the frame. I've changed the plans for my other almost identical Hindall and it'll get the hybrid DT2MX engine with YZ-A top end.
                                                                   

Hey Mark,
Where those YZA tanks alloy? I always thought they were steel for some reason,
Pete.