RT-2MX/YZ360A Hybrid

[Tahitian_Red]

I've been slowly accumulating YZ parts here and there for an RT-2MX/YZ360A Hybrid project (Firko would be proud ;-).  I picked this up the other day.



My black DT-2MX tank will be on eBay soon.

[huskibul]

    Wow ! great original patina ! hard to find like that these days   

[firko]

(Firko would be proud ;-).

Old Firko is indeed proud, for more reasons than the just hybrid. It's great to see the health speedhump hasn't dampened your enthusiasm mate. How are you feeling Jay?

[Tahitian_Red]

Bill,

You're tempting me to spend some of my RT hybrid money!  That would look nice on my MX100. ;-)

Firko,

I'm feeling great!  I've past every test so far, but still have a stress test coming up in the next two weeks.  The blood thinner is what will really hold me back for a year or so.  Building new ones and selling old ones is all I have right now.

[Tahitian_Red]

These are the forks I have for the project:



The cases are unstamped and already have the YZ clutch actuator:

[oldyzman]

Bill, That aluminium YZ125A tank is great value! Not a dent to be seen.
Brett

[Tahitian_Red]

Got YZ360 front and rear wheels today.  Still need to put the finishing touches on the RT-1, but the excitement of the chase (RT2MX/YZ360 Hybrid) is getting me fired up! 

Would love to find a Boyd and Stellings swingarm next.

[OverTheHill]

those forks always worried me when new as didn't appear very thick in the alloy sliders. [must be made off good stuff]Think i measured them back then compared to say any old trail yam or RT2mx & psyched me out even more. In saying that--never saw any break. Probably easily dented by stones fired by [50hp SC500's] if not protected. Good luck with the project. Takes me back to a BSA B50mx if that's what it was called, that a mate rode at our annual Woodville mx back in the day. By the end of the day the forks were bent forward but the worst problem was the alloy sliders were curved forward as well to the point that they stuck down on landing from a jump--just soft alloy i suppose but just shouldn't happen & in hind sight maybe should have turned them half a turn after every race that day. Thanks.

[Tahitian_Red]

I'm starting to re-think this project, maybe the MX250a/360a frame is a better starting point?  They seem to be more similar to the YZa frames (with the pipe passing through the split frame rails).  Will an RT2MX motor bolt into an MX frame?

[OverTheHill]

Morning all, new forum seems to work ok. RT2MX [or YZA/B type] won't bolt straight into an MX frame sorry. MX is the start of the later shape [stronger in my opinion] type motor which probably carried right through in various guises till [i dunno] "77ish. In saying that it could be 'made to fit', new motor appears a bit longer & might find the S/arm is shorter to keep a similar wheel base. Never liked my MX250A after it spat me off & jumped on me haha--DT2mx never did that!! Not sure now but the MX might be missing the underneath mount but has two in the front instead of one. Anyway--good luck.

[Tahitian_Red]

Thanks OTH!

Will the MX cylinders fit the older RTMX/YZ lower ends?

[firko]

Will the MX cylinders fit the older RTMX/YZ lower ends?

Will an RT2MX motor bolt into an MX frame?

A big no to both. I think the DT2MX frame is closer to the YZ than the later MX frame, but it's still comparing oranges to lemons. The same family but different enough to know the difference. Everything that Over the Hill Morley says. I reckon using the best suspension on the DT2MX frame would be a better option and without the engine mount welding dramas. I just picked up a great deal.....YZ125-A and YZ360-B TANKS in immaculate, original condition from a mate in Pennsylvania as a swap for a bed to sleep on when he comes here late in the year. How could I argue with that ?

[Tahitian_Red]

Wow two great YZ tanks!  Is Casa de Firko a four star resort?

 

OK, looks like it's back to plan A (cheaper that way besides).  If you get any leads on a B&S RTMX swingarm, here in the US please let me know.

[Rossvickicampbell]

and I am sure Firko you don't need the YZ B tank 

[Iain Cameron]

Red do you honestly think anyone would pass on a B & S alloy s\arm for a early DT\RT . If you get one I'll give my first born for it . Iain