Vintage Dirt Bike Q & A

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 Post subject: Bead/Rim lock
PostPosted: Mon Jul 07, 2008 10:02 am 
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Joined: Sat Dec 01, 2007 3:03 pm
Posts: 265
I am putting a cr250m rear wheel on my mt250 and wanted to know if it was supposed to have a bead lock on it mine does not but there are several holes in the rim so maybe someone took it off? Also where can you buy innertubes with the correct schrader valve so I dont have to drill out the hole to fit a modern schrader valve in.


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 Post subject: Re: Bead/Rim lock
PostPosted: Mon Jul 07, 2008 10:06 am 
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Joined: Sat Dec 01, 2007 3:03 pm
Posts: 265
ok I found the bead stoppers at bike bandit for 26 bucks I would still like to know where to get the correct innertubes.


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 Post subject: Re: Bead/Rim lock
PostPosted: Mon Jul 07, 2008 12:42 pm 
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Joined: Fri Jul 14, 2006 8:12 am
Posts: 323
Location: Wuppertal/Germany
a schrader valve has 7.7 mm OD and the hole in the rim is normaly about 8,3mm.
what do you have?

_________________
80 CR250Ra
80 CR250Ra
78 CR250R
80 CR80
82 Bultaco Sherpa 340
78 Bultaco Pursang 250 MK12
76 Bultaco Frontera 370 MK10
76 Bultaco Alpina 250
73 Bultaco Lobito 125 MK6
76 Suzuki RM125A
90 Kawasaki KX250


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 Post subject: Re: Bead/Rim lock
PostPosted: Tue Jul 08, 2008 2:20 am 
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Joined: Sat Dec 01, 2007 3:03 pm
Posts: 265
I thought I read on here a while back that the 73 74 cr250 had a smaller hole that didnt work with todays valves and that someone still sold the corect tubes. I may be wrong I dont have my rim at the moment but can measure it tommorow.


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 Post subject: Re: Bead/Rim lock
PostPosted: Tue Jul 08, 2008 6:41 am 
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Joined: Wed Mar 26, 2008 7:08 am
Posts: 7
Location: Myrtle Beach, S.C.
Woosh,
Different subject... Did you get the Mikuni from Elsinores.com ? And did the manifold fit better than the stock one that you had? Still want to order one but want to use the original manifold if it fits.
It's a money thang.
Thanks,
Jeff

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Jeff Smith
'78 Husqvarna CR250
'74 Honda CR250
'73 Bultaco Pursang 350
'78 Honda Z50 ( kids baby )


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 Post subject: Re: Bead/Rim lock
PostPosted: Tue Jul 08, 2008 10:20 am 
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Joined: Sat Dec 01, 2007 3:03 pm
Posts: 265
I did get a carb and manifold form vintage elsinores. It fits the cylinder real good but I had to remove the airbox and am going to put a pod filter on it. I am also gonna have to relocate the battery. This is on an mt250 not sure how similar the cr250 frame is to the mt250. The stock carb on the mt250 was a 28mm I think so I had to get the manifold as there was no way to get the new carb in the old manifold.


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 Post subject: Re: Bead/Rim lock
PostPosted: Wed Jul 09, 2008 10:05 am 
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Joined: Sat Dec 23, 2006 10:00 pm
Posts: 313
Location: CA
Woosh,

You can get the correct look valve at http://www.denniskirk.com. I use Kendas with the TR-6 valve which is the same
type of valve as the OE tube. Current bikes use a TR-4 valve.

dogger

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1973 CR250M
1979 CR250R
1993 CR250R
2008 CR500R
2009 CR250R


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 Post subject: Re: Bead/Rim lock
PostPosted: Wed Jul 09, 2008 12:57 pm 
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Joined: Fri Jul 14, 2006 8:12 am
Posts: 323
Location: Wuppertal/Germany
canĀ“t find a difference between the two valves except the fitting to the tube????

_________________
80 CR250Ra
80 CR250Ra
78 CR250R
80 CR80
82 Bultaco Sherpa 340
78 Bultaco Pursang 250 MK12
76 Bultaco Frontera 370 MK10
76 Bultaco Alpina 250
73 Bultaco Lobito 125 MK6
76 Suzuki RM125A
90 Kawasaki KX250


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 Post subject: Re: Bead/Rim lock
PostPosted: Wed Jul 09, 2008 2:59 pm 
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Joined: Sat Dec 23, 2006 10:00 pm
Posts: 313
Location: CA
TR-4 valve stem is 25mm, TR-6 is 30mm to accommodate the deeper dishing in the old style rims. Honda also specifies
a nut be threaded on the rim lock between the rim lock flange and the rim for the same reason.

dogger

_________________
1973 CR250M
1979 CR250R
1993 CR250R
2008 CR500R
2009 CR250R


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 Post subject: Re: Bead/Rim lock
PostPosted: Sat Jul 12, 2008 11:14 am 
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Joined: Sat Dec 01, 2007 3:03 pm
Posts: 265
Sorry one last question does the mr250 front rim use the tr-6 or the tr-4 innertube?


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 Post subject: Re: Bead/Rim lock
PostPosted: Sat Jul 12, 2008 4:36 pm 
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Joined: Sat Dec 23, 2006 10:00 pm
Posts: 313
Location: CA
You can use either one. The TR-6 valved tube is what came on the bike originally.

dogger

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1973 CR250M
1979 CR250R
1993 CR250R
2008 CR500R
2009 CR250R


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