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Author Topic: boysen reeds!  (Read 13523 times)

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Offline VMX Andrew

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boysen reeds!
« on: February 22, 2008, 09:12:02 pm »
hi chaps...just bought myself some new boysen reeds off evil bay for the CR500 and was wondering if anyone has used them and found some so [called power gains] or are they just another rip off power rubberband ;D  v8 vegetable jucie ;D type of gain....  ::)
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Offline Lozza

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Re: boysen reeds!
« Reply #1 on: February 22, 2008, 09:21:48 pm »
How far do you live from Hoony?



 ;D ;D ;D ;D


Sorry Hoony couldn't let that one go past
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Offline TonyB

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Re: boysen reeds!
« Reply #2 on: February 24, 2008, 08:13:47 pm »
Andrew I tried some and found they were crap,,, no wait super crap !! then I fitted V force and the bike is hauling ass now..Sorry to offer negative feedback, but they make the bottom end blubbery and very difficult to tune. Mine were fitted to a Yammie 465, but maybe they will work better on the CR??
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Re: boysen reeds!
« Reply #3 on: February 24, 2008, 09:15:36 pm »
anything (pre81) I've ever fitted with Boyesens definately had a noticable gain. I can't comment on other brands or big bores as my experience with them is limited to 250cc and under and Boyesen's only :-\
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Offline Lozza

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Re: boysen reeds!
« Reply #4 on: February 24, 2008, 10:09:23 pm »
Pro Series carbon fibre are wait for it as good as most carbon reeds the dual stage ones ever so slight improvement on stainless.Top petal is very flexible and flaps around uncontrollably when revs rise.Thier RAD valve isn't in the same league as V-Force
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Offline mboddy

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Re: boysen reeds!
« Reply #5 on: February 25, 2008, 07:04:58 am »
Quote from: TonyB on February 24, 2008, 08:13:47 pm
Mine were fitted to a Yammie 465

If you are not using them do you mind sending them to me so that I can try them in my IT250d please.

Quote from: TonyB on February 24, 2008, 08:13:47 pm
then I fitted V force and the bike is hauling ass now.

How do I find out which V-Force fits our old Yammies?
Can you tell me the model number you used in yours?

Thanks, Mark.

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Offline TonyB

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Re: boysen reeds!
« Reply #6 on: February 25, 2008, 11:24:33 am »
Mark, PM me with the dimensions of your reeds ie. length width etc, I looked on the yamaha parts site and the prefix to the part numbers is different but the rest of the part number is the same as my 81 IT465 reed and reed assy. It may fit but its probably easier to measure first. If they are the same then maybe the V force reeds I bought will fit your bike. Any Yamaha experts wanna give their opinion as to wether the IT465H (1981) reed block will fit or is the same as the IT250D (1977) block or reeds. If it fits they are yours no probs,  Mark I could post them but you will only know if they are gonna fit once you remove them.
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'Life's Journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways,totally worn out, shouting,  ' Holy sh!t... What a Ride!! ' '

Offline Hoony

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Re: boysen reeds!
« Reply #7 on: February 25, 2008, 05:15:42 pm »
Quote from: Lozza on February 22, 2008, 09:21:48 pm
How far do you live from Hoony?
 ;D ;D ;D ;D
Sorry Hoony couldn't let that one go past

should i post a pic of the "Loz-Valve" ?
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Offline Lozza

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Re: boysen reeds!
« Reply #8 on: February 25, 2008, 05:31:26 pm »
Even a bus load of QC's wouldn't even attempt to wriggle out of the iron clad "commerial confidience" clause you signed Hoony ;D ;D ;D ;D ;D
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Offline Hoony

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Re: boysen reeds!
« Reply #9 on: February 25, 2008, 06:37:34 pm »
(in a Maxwell Smart voice) would you believe 2 lowly solicitors and a flunky clerk?

can i wriggle out of naming my second born after you at least.
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Long time Honda Fan, but all bike nut in general, Big Bore 2 stroke fan.    http://www.youtube.com/watch?v=XJoKP6MawYI
1985 Honda CR500RF "Big Red"
1986 Honda CR250RG
2005 KTM 300EXC "The GruntMeister" ( I love that engine)

Offline mboddy

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Re: boysen reeds!
« Reply #10 on: February 25, 2008, 08:41:59 pm »
The IT250D reed block has distance between bolt hole centres of 71mm and 53mm.
This is also the same as an IT175J block that I have.
But the IT175J is broader at the base and so does not quite fit.

A Boyesen Catalog lists the 640 reeds for all IT250s and IT465s, IT425s, IT490s and some YZs.
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1980 Yamaha IT125G, 1979 Yamaha IT175F, 1984 Yamaha IT200L, 1977 Yamaha IT250D and IT400D

Offline Freakshow

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Re: boysen reeds!
« Reply #11 on: February 25, 2008, 09:03:12 pm »
the loz valve - wasnt that the icecream lid conversion ?
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Offline TonyB

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Re: boysen reeds!
« Reply #12 on: February 25, 2008, 09:15:56 pm »
Mboddy send me your adress and I'll post them to you, you can PM your address if you want
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'Life's Journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways,totally worn out, shouting,  ' Holy sh!t... What a Ride!! ' '

Offline LWC82PE

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Re: boysen reeds!
« Reply #13 on: February 25, 2008, 10:16:27 pm »
pitty us suzuki guys cant fit a V force. im still desperatley searching for a 6 petal DG reed valve for a RM/PE or a R & R Racing hi flow reed valve for a RM/PE. i will pay mega bucks if any one has one to sell! either of these reed valves are pretty much the only aftermarket part i can not find and its one of the last parts i want to find. pretty much every part i thought would be hard to find has fallen into my lap but not these reed valves
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Offline Lozza

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Re: boysen reeds!
« Reply #14 on: February 25, 2008, 10:58:57 pm »
Didn't see any ice cream lids Freaky.
No I wouldn't even believe a 12yr old debating champ who has watched every episode of Perry Mason, suppose it's better than the youngun being named  CR, Mugen or H*nda  Hoony ;D ;D ;D
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