Honda tappet spanner size

[Robby]

Now that I have a bike that requires relatively regular valve adjustment, I need to get a good approximation of the right tool.

Bike is a 1980 CB250RSA, with screw and locknut adjustment on rocker arms. The locknut is 8 or 9mm, so I have rings spanners that fit it. The problem is the tappet itself, it's about a 2mm square fitting, and I can't find any spanners that small. I may try a very small socket, but I soubt I have anything that small.

What do you guys use to hold the tiny stem when adjusting the valve clearance?

[neil.]

On my YBR I could hold it with my fingers (you could also try a pair of long nose pliers but it's fiddly). I eventually bought the tool for a few quid. Dunno if it will fit your engine though but it is also a square hole of a couple mm in size. Can give you the part number if you want to order it from a Yammy dealer?
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CBT February 2008 | A2 June 2008 | Yamaha YBR125 (written off) | Honda CBF125 (current)

[stinkwheel]

I use my fingers.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[yen_powell]

Go to a proper tool shop, one where the people serving are all over 50 and wear brown coats with a ruler sticking out of their top pockets. They will sell you a little 4/5mm open ended spannerthat looks like it is made for Action Man (or whatever size it is, I'll look when I get in tonight). That's what I use on my Honda, along with a 10mm ring spanner for the locknut.
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Blackmail is a nasty word........but not as nasty as phlegm!
XT1200Z and a DR350 in bits

[tatters]

Strange size imperial box spanner has worked for me in the past, like a screw driver with a socket fitted permintaly to the end
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

[DrDonnyBrago]

Me and Bacon used a pair of pliers with tape on the ends to do his CB250 valves, piece of piss tbh. IIRC though there may have been a tool suggested in the manual...

Pliers work fine though with tape to prevent damage to the tappet.

[The Shaggy D.A.]

I used a long thin spanner that I nicked from my dad's toolbox. I think it was a spoke nipple tool for bicycles.

You might find an ignition spanner that fits :-

https://www.diytools.co.uk/diy/Images/DB_Detail/_26147_139473.jpg
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Chances are quite high you are not in my Monkeysphere, and I don't care about you. Don't take it personally.
Currently : Royal Enfield 350 Meteor
Previously : CB100N > CB250RS > XJ900F > GT550 > GPZ750R/1000RX > AJS M16 > R100RT > Bullet 500 > CB500 > LS650P > Bullet Electra X & YBR125 > Bullet 350 "Superstar" & YBR125 Custom > Royal Enfield Classic 500 Despatch Limited Edition (28 of 200) & CB Two-Fifty Nighthawk > ER5

[Bru]

A Honda dealer should be able to get one for you. Mine cost about £3, a couple of years ago. It has a proper Honda part number - any competent person at the service desk should find the details for you.

[Howling TerrorOutOfOffice]

Fingers for 3 of them. Needlenose for the stubborn one. Its an 8mm locknut. Will butcher a screwdriver next time. i.e 2mm slot with a 45 degree bend.

Pic for illustration purposeshttps://i104.photobucket.com/albums/m174/howlingterror_2006/IMG_0246001-1.jpg

Pat
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Diabolical homemade music Bandcamp and Soundcloud
Singer songwriter, Artist and allround good bloke Listen to Andrew Susan Johnston here
The Harry Turner Project

[Robby]

I've done a bit more googling and it seems that it's a 4mm stud, so I've ordered a 3.2/4mm combination spanner that should do it.

The problem is that it's one of those jobs that needs too many hands, seeing as the exhaust rockers have a spring forcing them down onto the valve. Should be able to get the clearances sorted properly now.

[Howling TerrorOutOfOffice]

A photo in the Haynes shows a 1/8th (3.1750mm) on the adjuster nut. It isn't a good fit.

Pat
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Diabolical homemade music Bandcamp and Soundcloud
Singer songwriter, Artist and allround good bloke Listen to Andrew Susan Johnston here
The Harry Turner Project

[Pete.]

I've always used pliers.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good