Hi All,

Picked this mower up about a year ago - previous owner said it just needed a new drive belt. I had the old one which I took to a store and found it was an M37 v-belt.

Contacted Masport for info on the mower and curiously they claimed they never made such a model (800ST with GXV160 on it) - this was very odd as I have found posts on several sites discussing this exact mower. As the serial number sticker on the mower was missing/unreadable i could not give them this and they said they couldn;'t trace it but felt it must have been a re-engine - but that seems very odd to me and original owner swore it was bought brand new like this.

Anyway.......when i fitted the new belt I found that it did not work correctly. Speed was far too slow - think Grandpas morning walk on a very cold winter day down in Tassy. The handle on the handebars which is meant to control the speed setting (variable you push up or down to adjust the tension on the belt placed by the pulley under the deck) would only go down about 1/2 way - as the pulley was literally against the wall of the deck.

I can't figure out exactly how the pulley and belt should be arranged - this one is pushing the belt outwards, but generally it seems that SP mechanisms push them inwards to increase speed, but can't see how to do this due to it only able to be in once spot.

I have a Google Photos gallery with all the images of the machine and underneath - did a quick MS paint to show where the cable moves to move the pulley but I am sure it's wrong.
PHOTO GALLERY OF MOWER

if folks prefer pix put on here instead pls let me know - I've a feeling the belt needs to be fed through the pulley as at present the flat pulley (innermost one) doesn't touch it at all, only the outer (v-pulley) pushes it outwards.

Thank you as always for any feedback.