Diff'rent Strokers

trev45 · Joined: 18 Dec 2010 Posts: 47 Location: Sydney Australia

MVX250 pistons

Ok I found one 47.5mm 0.5mm oversize and with out getting the verniers out could be a CR85 piston ? (half moon in place of a window etc)
The ? is has some one found a slug that fits for this bike ?

Trev
_________________
Racing is for the track, riding is for the road
Both are FUN

trev45 · Joined: 18 Dec 2010 Posts: 47 Location: Sydney Australia

Crown is 3mm higher on the MVX250 so a longer con rod on the crank ?
I will find some thing that works and more power Very Happy

Trev
_________________
Racing is for the track, riding is for the road
Both are FUN

Mr FFF · Posted: Mon Jan 31, 2011 4:32 pm Post subject:

Hi Trev

The trouble is the rear piston has either a 14 or 18mm pin against the fronts 12mm. I have some pattern fronts that come in closer to what you have. Could only need the window in the skirt matching, but I only got them the other day and havent had a chance to measure them yet.

If your Cr piston is 3mm shorter pin to crown, then you could have the bottom of the cyliders machined, but you cant put it back afterwards.

An MBX80 piston is pretty close and could be worth a look, but again it leave the problem of the rear pistons. Maybe we could have a batch made and get the £400 each price down a bit.

I have a variety of new genuine Honda pistons, but at this stage looking to swap to make up sets.
_________________
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.

trev45 · Joined: 18 Dec 2010 Posts: 47 Location: Sydney Australia

Hi all
My maybe one day when you can not get anything anymore is a conrod and piston combo (with fry's) but there are still lots of bit still around as I have found out so all good for the time been Very Happy

Trev

PS three is better than two Wink

_________________
Racing is for the track, riding is for the road
Both are FUN

Alastair · Joined: 13 Jan 2007 Posts: 62

Have a chat with Ian wright at Classic Race Replicas. He's identified pistons suitable for the NS400 and might be able to help with the MVX. If you don't ask, you never know.
_________________
Alastair

CBR1000RR6 (0 - Court in 2.5 seconds)
NS400RF
MTX80RFD

trev45 · Joined: 18 Dec 2010 Posts: 47 Location: Sydney Australia

Don't panic yet got 5 more pistons today that 7 in total this week
me so happy Very Happy

Trev
_________________
Racing is for the track, riding is for the road
Both are FUN

Mr FFF · Posted: Fri Apr 08, 2011 10:02 am Post subject:

Guys

I have cleared out another Australian dealer of his MVX250 engine parts, so I have gaskets, o rings, seals, pistons, rings and rods on their way to the UK, but I still cant put a set of pistons and rings together.

I need

front 0.5 pistons 13092-KG4-505
Std front pistons 13101-KG4-000 - 13102 - 13105
0.25 rings 13012-KG4-305
Head gasket 12251-KG4-000

Willing to buy or swap from my stock of over £6K of MVX parts
_________________
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.

Mr FFF · Posted: Sat Apr 23, 2011 4:10 pm Post subject:

Finally got to list my MVX250 piston and ring parts list

13011-KG4-305 6 Rings Std
13012-KG4-305 2 Rings 0.25
13013-KG4-305 10 Rings 0.5
13014-KG4-305 7 Rings 0.75
13091-KG4-505 7 Front Piston 0.25
13092-KG4-505 1 Front Piston 0.5
13096-KG4-305 2 Rear Piston 0.25 14mm
13097-KG4-305 2 Rear Piston 0.5 14mm
13097-KG4-505 2 Rear Piston 0.5 14mm
13098-kg4-305 1 Rear Piston 0.75 14mm
13103-KG4-000 7 Piston Rear 14mm
13103-KG4-506 2 Piston Rear 14mm Teflon
13104-KG4-000 4 Piston Rear B 14mm
13104-KG4-306 2 Rear Piston B 18mm Teflon
13104-KG4-505 1 Rear Piston B 14mm
13106-KG4-000 1 Front Piston

My gaps are the following

13012-KG4-305 Rings 0.25
13092-KG4-505 Front Piston 0.5
13106-KG4-000 Front Piston
??????????????? Front Piston 0.75
??????????????? Rear 18mm Piston Pin

I am still willing to buy or swap to fill my gaps

Also looking to buy any NOS MVX250 engine or Craburetor parts. I have two centre and two right new carbs

16102-KG4-681 2 Carb
16103-KG4-681 2 Carb

Looking for new left carb

16101-KG4-681

Again, willing to swap or buy
_________________
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.

trev45 · Joined: 18 Dec 2010 Posts: 47 Location: Sydney Australia

Some of the bits I have is Sydney + one new crank thanks Ian

pistons
13091-kg4-505 x 2
13096-kg4-505 x 3
13097-kg4-505 x 1
13098-kg4-505 x 1

rings
13011-kg4-305 x 3
13013-kg4-305 x 2

bearings little end
91015-kg4-000 x 1
13116-kg4-305 x 6

little end pins
13111-kg4-000 x 1
13115-kg4-000 x 3

Trev
_________________
Racing is for the track, riding is for the road
Both are FUN

Alastair · Joined: 13 Jan 2007 Posts: 62

you might want to ask some more here http://www.ebay.co.uk/itm/HONDA-MVX250-PISTON-KIT-0-25MM-MVX250F-NS400R-RARE-NOS-/320761873729?pt=AU_Motorcycle_Parts_Accessories&hash=item4aaee5c541#ht_502wt_1185 Seller claims to have other MVX parts.
_________________
Alastair

CBR1000RR6 (0 - Court in 2.5 seconds)
NS400RF
MTX80RFD

trev45 · Joined: 18 Dec 2010 Posts: 47 Location: Sydney Australia

They are my parts
I am done fix up the MVX250 , now it the three VDUE's to do
so time to clear out some stuff left over etc

Trev
_________________
Racing is for the track, riding is for the road
Both are FUN