What size nut for rear axel of 1986 helix

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What size nut for rear axel of 1986 helix

Postby wyliewesty » Fri Jun 18, 2010 2:03 pm

Anyone know what size the rear axel nut on a 1986 helix is? My bike is missing this nut and I want to get a replacment.
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Postby dneilson » Fri Jun 18, 2010 3:57 pm

Not sure but maybe you can find out in the Service Manual.

http://mpsracing.net/helix-manual/
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Nuts!

Postby zozman » Fri Jun 18, 2010 8:09 pm

16mm
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Postby coopdway » Fri Jun 18, 2010 8:27 pm

16? Which nut is that?
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Postby coopdway » Mon Jun 21, 2010 8:25 pm

Oops, sorry for doubting you Randy. I was sure you mis-typed. I had no idea they ever put such a small one on. I knew mine was almost twice that size.
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The nuts

Postby zozman » Tue Jun 22, 2010 7:14 am

According to Honda parts fiche, all Helix axle nuts are 16mm.

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Postby coopdway » Tue Jun 22, 2010 6:36 pm

I didn't measure, but my guess is that the axle is 16mm in diameter. A 24mm wrench fits my nut perfectly. Parts fiche looks like they had a smaller sized nut across the flats, then upped it in '88. The axle size most likely stayed the same.
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My Bad

Postby zozman » Wed Jun 23, 2010 8:48 pm

You are correct. The Honda CH250 (1985-1988) and the Helix (1986-87) used the 90305-ME5-003 ($2.97) axle nut which was 14.53 I.D. and 24.00 O.D. So your 24mm wrench will take the nut off and on. There was no Helix in 1988. The parts fiche shows 16mm which must be the axle diameter. The Helix (1992-2007, less skipped years) and the Reflex uses 90305-KBN-901 ($12.24 what the?) axle nut which has the same dimensions. What I learned in all of this is buy the $2.97 part because it's cheaper and will fit.

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Axle Nut

Postby fixer311 » Thu Jun 24, 2010 9:57 pm

I just had mine off to change the tire and it was the largest in my set from Harbor Freight and I think it was 24mm. Mine is a 2006 and my memory of mm threads is not good as I was raised on sae.
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