OzVMX Forum

Marque Remarks => Yamaha => Topic started by: Paul552 on December 07, 2012, 09:16:29 pm

Title: V force reeds
Post by: Paul552 on December 07, 2012, 09:16:29 pm

Got my yz going today :) so cool!!!!

The intake while not leaking it is cracked a bit.

Question is can you fit a vforce reed block on a old yz 125d


Is there a interchangeable model?
Anyone tried it??

Title: Re: V force reeds
Post by: oldyzman on December 07, 2012, 09:53:06 pm

I have no idea, considering i have an E, i am interested to see the answeres, Also to expand on the question - What would the benefits be, would this enable you to change the inlet port timing..
Brett

Title: Re: V force reeds
Post by: holeshot buddy on December 07, 2012, 10:01:44 pm

yeah i think it is a cr125 from memory 8)

Title: Re: V force reeds
Post by: Paul552 on December 07, 2012, 10:03:57 pm

Quote from: holeshot buddy on December 07, 2012, 10:01:44 pm

yeah i think it is a cr125 from memory 8)

Year model??

Title: Re: V force reeds
Post by: Lozza on December 07, 2012, 10:42:34 pm

Quote from: oldyzman on December 07, 2012, 09:53:06 pm

I have no idea, considering i have an E, i am interested to see the answeres, Also to expand on the question - What would the benefits be, would this enable you to change the inlet port timing..
Brett

The reed does the timing not the port

Title: Re: V force reeds
Post by: holeshot buddy on December 09, 2012, 12:01:12 am

i think 2000 0r later maybe check it out ;D

Title: Re: V force reeds
Post by: SON on December 09, 2012, 06:08:45 am

The Piston and the port does the timing, the reed allows excessive ports to continue to operate efficiently.
Back in 1975, I put a GEM Reed Kit into a green tank 125 Elsinore that was ported beyond belief with a 36mm carb, Yes it was fast, No I couldn't ride it.

Title: Re: V force reeds
Post by: Lozza on December 10, 2012, 05:51:50 pm

Quote from: SON on December 09, 2012, 06:08:45 am

The Piston and the port does the timing, the reed allows excessive ports to continue to operate efficiently.

???
If this were remotely correct a case inducted reed engine would never work. Cylinder reed engines inlet ports are continuously open. Reed petal is open in accordance with engine demand, opens and closes later with increasing rpm.

AFAIK all the CR125(same as RS/NSR) bolt pattern is the same except for 2 years when they went to a 5 sp (03-04???)

Title: Re: V force reeds
Post by: SON on December 15, 2012, 02:45:24 pm

Remotely correct it is , the reed is only preventing induction blow back allowing transfer to continue
Substitute a rotary valve for the reed and think about it,
just a basic pump not chicken and egg stuff,
file a few miilimetres off the top of a piston,
what happpens? nothing to do with the reeds??

Title: Re: V force reeds
Post by: Viper666 on December 15, 2012, 09:59:38 pm

YZ80 or 85 but I can't remember which year.

What I did was measure the intake port, width & hieght & bolt hole centres & they sent me one that fitted.

Title: Re: V force reeds
Post by: Lozza on December 16, 2012, 12:32:00 pm

Quote from: SON on December 15, 2012, 02:45:24 pm

Remotely correct it is , the reed is only preventing induction blow back allowing transfer to continue
Substitute a rotary valve for the reed and think about it,
just a basic pump not chicken and egg stuff,
file a few miilimetres off the top of a piston,
what happpens? nothing to do with the reeds??

I don't need to think about anything, the reed is open when the piston is rising the transfers are not open and certainly to "flowing"

Title: Re: V force reeds
Post by: SON on December 16, 2012, 01:26:03 pm

yes that part is obvious