500 Two-Stroke Tech

Matty,

I put YZ125 fiber reed petals on my RD500 cages last week.
It feet perfectly without putting a 0.2mm sheet metal because fiber petals are not plate (small bending like steel petals).
So they are perfectly closed.

Franck

Hi,
A friend is very interesting by Banshee reed petals to put on his RD 350 31K cages (whish are installed on a 500RD).
Holes are they at the same position on both?

Franck

I think you will have poor torque and HP at middle range with cylinders without valves. It will be a very hard ride bike ! I think it could be interesting to put an extra exhaust chamber like RG500 or mainly like 125 CR honda 1984 (chambers between cylinder and pipe). With that, it could be more rid...

Hi, see photos with comments. Mains modifications for each upper pipe: - 4 cuts and 4 welds (2 diameters, the rear sheet metal pipe fix and 1 spring fix) - 3 silencers holes welded (to close them) and relocated. It's needed to have a good orientation of the silencer end tube. This mod is only for la...

Be patient....I'm writing the upper jolly pipe mod howto for "in the tail version". I will post it on Friday evening (French time). Be carefull, it's for a mod with tail, seat and fairing from a R1 . So probably it could be necessary to adjust cones cutted before welding if you have anothe...

Updated with TZR 250 2MA / TZR-TDR-DTR 125.
I measured TZR reeds I bought for my 2nd engine tuning.

Franck

Hi Matt,

See new photos:

http://s265.photobucket.com/albums/ii22 ... ipe%20mod/

I will make a small howto from my Jolly pipes conversion next week.

Cheers,

Franck

I've just bought 2 sets of YZ 125 55Y on Ebay for 28$, shipping cost included ! a good deal...
then I could prepare 2 cages + 1 other with each petal cutted on 2 others. So just 1 set is missing me now.
Franck

Gus,
Thanks for reeds informations. I will try to find these reeds in yamaha dealer.
VMA500,
I already have this reed photo with differents reed cages dimensions, but infortunately not really readable.

Franck

Hi, I think this information was already posted but I didn't find it. My conclusions: Carbon petals --> too stiff Boyssen fiber petals --> a big shit 250 TZR 2MA / 125 TZDR/TZR --> width petal too thin. 350 Banchee --> petal too short 250 TZR 3MA --> I think it's possible with light mod. 250 TZR 3XV...

Bill,
You could also have a big market in Europe with this price, because of the money ratio between Dollar and Euro (near 1,47)
So if you could sell that for 850-900 euros with shipping cost included, it will be a great deal !

But you arrived to late for my bike !

Franck

Luther,
Very nice adaptator mod !
I think I will also do it in Delrin instead of aluminium.
Do you have a drawing of it? I could be interesting by.
Franck

Hi,

See link to my photos albums:
http://s265.photobucket.com/albums/ii229/solex27/

Then you click on albums links on the left under solex27.
I tried to sort photos.

Regards

Franck

Steve,
I will post a Photobucket.com link with lot of photos taken since the beginning of the project . Wait a couple of days !
Franck

Your adaptator is not fixed? It can slide on carbs?

I planed to fix adaptators (built in aluminium) to carbs with flexible collars.