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Author Topic: yz465h. no torque like i remember!  (Read 12031 times)

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Offline vandy010

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Re: yz465h. no torque like i remember!
« Reply #15 on: May 07, 2009, 12:48:28 am »
i had some trouble a while back with a needle jet that was "spun" slightly off line.
i must've had the carby off 10 times before i found it as it was only ever so slightly miss~aligned.
it would idle well but missed and blubered when reved.
CD6 on a 465 hey? very cool Tony 8)
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Offline YZ250H

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Re: yz465h. no torque like i remember!
« Reply #16 on: May 07, 2009, 04:55:31 pm »
Not with you on that one Mick ::). What's with the spinning of the needle ??

Don't worry I already have you on the list for a ride on it - if I can get it going properly.  It's no beauty Queen, but is Mechanically very good.  I will ride it as is for a while until I have the other restos I want to do done (250, 50, 125) then she will get the cosmetic makeover - not a lot to do - a bit of paint here and there, replate a few things and tidy up the tank.

Looks like the 250 is going to have to miss the trailer to CD6 as she won't be quite finished (thanks very much XYZ in USA  >:( >:( >:( - has anyone had any luck with this absolute idiot ?  I swear all I want to do is give him a few hundred US dollars and I still can't get him to talk to me.  All he has to do is put the stuff in a box and go to the post office - how hard can it be ?)  No side covers or decals.  No manifold either.  So close, yet so far off  :'( :'(.
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Looking for YZ250C parts NOS if possible

"My inability to use emoticins in the right context is really getting me down :)
Quote from: GMC on May 03, 2014, 10:35:22 am
The only triple jumps he would have been doing are the hop, skip & jump.

Offline oldyzman

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Re: yz465h. no torque like i remember!
« Reply #17 on: May 07, 2009, 08:54:29 pm »
Just one other thing that i recently found to be an issuie on my yz250F where the inner magneto rotates it was rubbing on the wires from the stator coils and had wore a hole in them, I couldn't see this until i pulled off the rotor to do a bottom end rebuild all good now...
OLDYZMAN
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Offline vandy010

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Re: yz465h. no torque like i remember!
« Reply #18 on: May 08, 2009, 12:36:16 am »
Quote from: YZ250H on May 07, 2009, 04:55:31 pm
Not with you on that one Mick ::). What's with the spinning of the needle ?

perhaps i didn't make myself clear enough Tony,
the "needle jet" not the needle.
basically it had rotated slightly and didn't work properly.
bugger.
a 465 hey... i'll have some bikes on the the ready too mate and you're more than welcome.
i should be there friday arvo~ish... :)
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Offline Marc.com

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Re: yz465h. no torque like i remember!
« Reply #19 on: May 08, 2009, 03:54:42 pm »
Quote from: YZ250H on May 06, 2009, 08:20:34 pm
DOH! forgot one critical thing.  When I turn the fuel off and run it out it goes well again very briefly when running out.

hmm yes that is a critical thing, when you cleaned the carb are you sure you got the float in and the float valve all back in the same way, sounds like they are leaking and she is over fueling, thats why when you drain the float bowl just before it runs out of gas it comes right. Judging by this being a deteriorating thing the floats may also be leaking or filling with fuel.
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Offline YZ250H

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Re: yz465h. no torque like i remember!
« Reply #20 on: May 09, 2009, 11:39:57 am »
That's not a bad thought Marc.  I have a YZ250H carb here.  I think they are the same.  I left my frickin' manual at home unfortunately :-\ so I'm not sure.  I'll put them side by side.  It will idle all day on the pilot - would that still indicate the floats filling up.  Worth a try anyway

Anyway - fitted the new air filter.  Put the needle back on the top clip (where it was originally when I got it) and got the following numbers for jets.

Slide - number 3 looks to be not worn at all
Needle - 6F18
Needle jet Q-2 (also has number 247 on it)
Main Jet 400

I was lazy and didn't measure the pilot 'cause I couldn't find a small screw driver and I think the pilot is about right  ::)

What do you all reckon - should I bother putting the carb back together or go straight for a change of jets?.
If I had my manual here I would have more of an idea if they are right  >:( - anyone got one handy?
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Looking for YZ250C parts NOS if possible

"My inability to use emoticins in the right context is really getting me down :)
Quote from: GMC on May 03, 2014, 10:35:22 am
The only triple jumps he would have been doing are the hop, skip & jump.

Offline KB171

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Re: yz465h. no torque like i remember!
« Reply #21 on: May 09, 2009, 12:18:21 pm »
Gday Tony ,   Clymer manual, for YZ465g
VM38ss
ID 3r500
Main 400
Needie jet Q.2
Pilet 50
Jet needle 6f16
Clip pos 2
float height 1.06 in    27 mm.
hope thats of some help, cheers KB.
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Offline YZ250H

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Re: yz465h. no torque like i remember!
« Reply #22 on: May 09, 2009, 01:47:55 pm »
You are a legend KB - is the 465G the same as the 465H ?
Looks like I've got most of the numbers right.
Hope the lotto tonight is the same  ;)

I will put the carb back together and fire her up to see what happened.

I probably should do that so we can work out what the problem was anyway.
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Looking for YZ250C parts NOS if possible

"My inability to use emoticins in the right context is really getting me down :)
Quote from: GMC on May 03, 2014, 10:35:22 am
The only triple jumps he would have been doing are the hop, skip & jump.

Offline Marc.com

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Re: yz465h. no torque like i remember!
« Reply #23 on: May 09, 2009, 02:19:49 pm »
yeah it will idle all day because it can run a little rich at idle, but if it blubbers as soon as you snap the throttle that gives some indication that it is rich at idle.

swap to the 250 carb, with 400 main, it will be near enough to test it and it will eliminate the carb as the problem....my money is that it will go like hell with the 250 carb on it.
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Offline KB171

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Re: yz465h. no torque like i remember!
« Reply #24 on: May 09, 2009, 04:15:10 pm »
 Heres the whole page ,might be of use,cheers
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lms6201

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Re: yz465h. no torque like i remember!
« Reply #25 on: May 09, 2009, 06:13:56 pm »
i,m having similar drama with mine ,i suspect it,s the reeds , boisen,s ,probably fatigued   , will  try stock reeds i think 
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Offline oldyzman

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Re: yz465h. no torque like i remember!
« Reply #26 on: May 09, 2009, 09:12:47 pm »
does anyone know why the air jet is not mentioned in the specs (the one that sits on thew inside of the bell)
OLDYZMAN
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lms6201

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Re: yz465h. no torque like i remember!
« Reply #27 on: May 09, 2009, 10:47:59 pm »
it,s in the text of the manual , not in the chart
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Offline oldyzman

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Re: yz465h. no torque like i remember!
« Reply #28 on: May 09, 2009, 11:25:41 pm »
Gday IMS6201,
Can you tell me what is says in the manual for a yz250F 1979 about the air jet...
Brett
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lms6201

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Re: yz465h. no torque like i remember!
« Reply #29 on: May 10, 2009, 05:59:40 am »
1.5 turns on pilot screw , 400 main, q/8 , 6f16 , 50 , clip pos 4 , ( pos 1 is the top )
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