Mk 2 pistons

[new to this]

How do you read the markings on the top of a dome top piston, on mine it said +20 ,but when looking some old one's and over the weekend they had a letter F or G j173

Dave

[flying farmer]

The original pistons were sized F and G, one being half a thou bigger than the other, they selected the correct one for the finished bore size at the factory.

Oversize pistons generally only come in +20 or +40 thou with no grading

[new to this]

Neil

Thanks, are +20 and +40 hard to find ?

Dave

[flying farmer]

Very difficult to find in the domed variety.

JP pistons do make a MK2 domed piston but they are very heavy and use thicker piston rings. I have a set in my P reg Stag, I found they were fitted when I had to rebuild the engine following jackshaft seizure a few years back.
They tend to be heavier on the oil consumption due to the thicker rings, and are rather prone to seizing, I had scuff marks on the skirts of some of mine, and Tractor James wrecked his after several partial seizures so I wouldn't use those.

Neil

[dasadrew]

Neil

Thanks, are +20 and +40 hard to find ?

Dave

Hen's Teeth. I tried worldwide for a couple of years. Finally went down the liner route and used the original pistons.

Drew

[new to this]

Hen's Teeth. I tried worldwide for a couple of years. Finally went down the liner route and used the original pistons.

Drew

Drew

Can't do the liner route ,as I was a bit heavy handed and broke one piston

Dave

[DJT]

Paddocks are listing used Mk2 pistons in std and +40 at £19.95 each.

[new to this]

Paddocks are listing used Mk2 pistons in std and +40 at £19.95 each.

Thanks already seen them,but I need either one +20 or eight +40

[garyf]

Thanks already seen them,but I need either one +20 or eight +40

I think I have a couple of used pistons at home don't know what bore size they are.Im working away in Hull at the moment so I can check at weekend if your intrested

[dasadrew]

Paddocks are listing used Mk2 pistons in std and +40 at £19.95 each.

I should have mentioned in my post about their unavailability that I was looking for NOS pistons!

Drew

[thebadleys]

I have a set (8) of used +020" MK 2 pistons available if they of interest.


Nigel

[rwdstag]

I too have 8 + 20 pistons not domed
failing that phone Tony white he has domed pistons and just about everything else
keep trying if you fail on the first call he runs his business out of a workshop at the end of Heathrow run way so it can be a bit noisy
smashing guy though
Rich

[new to this]

I too have 8 + 20 pistons not domed
failing that phone Tony white he has domed pistons and just about everything else
keep trying if you fail on the first call he runs his business out of a workshop at the end of Heathrow run way so it can be a bit noisy
smashing guy though
Rich

I've been to Tony