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Classic Bike Trackdays

Rusty MVX250 Motor

 
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Mr FFF



Joined: 04 Sep 2010
Posts: 88
Location: West Malling, Kent (Nr Brands)

PostPosted: Thu Nov 04, 2010 7:23 pm    Post subject: Rusty MVX250 Motor Reply with quote

Spent the afternoon at Dave Hammonds workshop in Dover delving into the inner depths of one of my MVX's

It dont look good. Although the motor ran yesterday and sounded sweet, when I took the top end off the crankcase chambers were full of rust and sludge. The cranks doesn't spin very smoothly and the little ends are rough too. Pistons and rings look good, but I'm doubtfull the bores will clean with a hone and will need a re-bore. All the result from standing in a Japanese back garden for twenty years or so I guess.

But we can rebuild it..........I hope

I have new cranks, but I am really looking for a 0.5mm front piston to make a set, or two sets of 0.25mm rings. Any rear small end bearings wouldn't go a miss either.

I could build it with odd sizes of pistons, but that would be a last resort.

Can anyone help. Cash waiting or swaps

How do I upload pics to keep you all up to date
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MVX250 1983 MVX250 1984 GT380J 1972

Valves are for toilets unless they are power valves.
Claim to fame. Have beeten Casey Stoner over a championship season.
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BenR



Joined: 24 Aug 2009
Posts: 59

PostPosted: Thu Nov 04, 2010 9:11 pm    Post subject: Reply with quote

Upload your photos to photobucket.com then copy & paste the IMG tags on here & they will show.
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Mr FFF



Joined: 04 Sep 2010
Posts: 88
Location: West Malling, Kent (Nr Brands)

PostPosted: Sat Nov 27, 2010 4:34 pm    Post subject: Reply with quote




As you can see there is a rusty crank and some nasty looking sludge in the crank chambers. Amazingly this motor sounded crisp just before the strip. The mains are shot (lucky I have a supply of new cranks) and a bit of luck is the gearbox and clutch are all perfect.

Will post more pics as the re-build takes shape.
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MVX250 1983 MVX250 1984 GT380J 1972

Valves are for toilets unless they are power valves.
Claim to fame. Have beeten Casey Stoner over a championship season.
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Alastair



Joined: 13 Jan 2007
Posts: 62

PostPosted: Sat Nov 27, 2010 8:36 pm    Post subject: Reply with quote

That looks well shot. Lucky you have new cranks. They are still available from Honda at silly money.
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Alastair

CBR1000RR6 (0 - Court in 2.5 seconds)
NS400RF
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Mr FFF



Joined: 04 Sep 2010
Posts: 88
Location: West Malling, Kent (Nr Brands)

PostPosted: Sat Nov 27, 2010 9:07 pm    Post subject: Reply with quote

If you are refering to the CMSNL price, then they are indeed silly money.

However I have a supply at a fraction, and I mean a fraction of that cost with some still available if any one is interested. They are genuine Honda parts, 13000-KG4-000
brand new in boxes, and the two I've opened are in factry fresh perfect condition.

Post here, pm or e-mail to ianlread@yahoo.co.uk
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MVX250 1983 MVX250 1984 GT380J 1972

Valves are for toilets unless they are power valves.
Claim to fame. Have beeten Casey Stoner over a championship season.
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mavesyn



Joined: 02 Jun 2009
Posts: 29
Location: staffordshire

PostPosted: Tue Dec 21, 2010 5:49 pm    Post subject: Reply with quote

Nasty rust.
I've never seen so many post's about MVX's, all good stuff......
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trev45



Joined: 18 Dec 2010
Posts: 47
Location: Sydney Australia

PostPosted: Wed Dec 22, 2010 1:04 pm    Post subject: Reply with quote

New cranks umm sounds good any idea on cost

Trev
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Both are FUN
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