Pre 1975 reed valved CR125M

[JohnnyO]

My GEM reed had 4 bolt holes like std and as I've said it bolted straight on and was very close to the length of the std manifold so the carby fitted properly also. No machining was required although I did match it to the inlet port.
My reed block was vertically split but it was shaped like a W not a V and had 12 reed petals. I did away with that setup because the cage was bulky and too restrictive. I fitted a 6 petal horizontally split yamaha reed cage inside the GEM housing and it worked brilliantly.
I would say your GEM reed was not for a Honda because it was nothing like mine and I had 2 the same for CR250M's.

[LWC82PE]

I have the GEM catalogue. There were several fitments

CR250 74 and earlier #5342 (V12 reeds) - only requires piston mod
CR250 & MR250 75 and later #5372 (V12 reeds) - only requires piston mod

MT250 & Odyessy #5348 (V12 reeds) - some machining/mods to exterior of inlet port is necessary. Installation of boost ports is recommended

CR125 75 and earler using stock carby #5340 - no mods required
CR125 75 and earlier using 30-34mm mikuni #5346 - no mods required
CR125 76 and later using stock carb or 30-34 mikuni #5338 - requires some re-shaping and slight modification to inlet port

Boost ports recommended on earlier models but GP 75 and 76  cylinders only require minor mods in this area

MR175 stock carby #5352 (V4 reeds) - no mods required
MR175 with 30-34 mikuni #5353 (V4 reeds)- no mods required

Boost ports recommended for max performance

MT125 with stock carb #5354 - no mods required but some slight grinding of the cases needed. Boost ports recommended.

[KB171]

Standard CR250 barrel & what i believe is the Gem setup  that was avalible at the time, Did they work unmodified ??

[JohnnyO]

That's the one KB, thanks for the pics.
They work ok std but I cut the centre out of my housing  and used a Yamaha reed cage.

[FourstrokeForever]

Yep, that's similar to what was on my Elsinore KB. I should of mentioned that my GEM had the twin reed block with 3 petals on each side of the V. In total 12 petals. Maybe the GEM reeds I had were not meant for the CR??? I id buy the setup 2nd hand so maybe it was modified before I got it.....
Fitting the 6 petal reeds from a later model bike would be the go for sure. As Johnny said, I would think the 12 petal set up is restrictive in comparison to a horizontal set up.

[Lozza]

The Mossberger is a 4 bolt to the cylinder and 4 bolt to the cage takes 'another' Honda cage and stuffer that is the best set up. Hmm have a drawing of the Mossberger housing  who does casting...............

The GEM reed cage is far from restrictive has lots of tip area which is exactly what V force did.

[TT5 Matt]

i finally know what bike/models the after market reed setup fits that i got from the wreckers now so anyone want to buy as it wont fit what i brought it for without alot of work in adapting it to fit my rms125,thanks KB171 for posting the pics of it

[tony27]

Lozza you got a drawing to reed up the H2 ? > Thats a thought I am playing with .

There is a place in the states who does reed valve conversions for H2s, will see if I can find the details after work tonight

[Lozza]

Lozza you got a drawing to reed up the H2 ? > Thats a thought I am playing with .

Would be very easy if you have access to a CNC machines .....   John Aylor or JaMoo is what he goes by on many forums who makes the reed conversions. Need to do the cylinder as well to get the most from it.

[tony27]

Lozza you got a drawing to reed up the H2 ? > Thats a thought I am playing with .

Here you go Walter
http://www.3cyl.com/mraxl/aylor/

[Tim754]

Pre 75 Hodaka 125 Super Combat MX, Great smooth power from it's stock read valve set up, standard ( OK close ratio) shitfull gearbox.....