Betor Shock Rebuilds

[Tim Stone]

Does anyone know what oil quantity and pressure to run in Betor shocks?
I have just rebuilt with new rod seals, and have tried 50ml oil and 40PSI but have to much "race sag"
I was unable to measure how much oil and pressure from STD as it all leaked out.
Any help appreciated.
Shocks are for a TY they are Betor 40LBsprings 360mm centres.

[Guy53]

Hi Tim

Sorry, I can't help with your question, but, maybe you can answer mine. Is your TY a 250, and if so, why the 360mm ? I always tought that 340 mm was the lenght to go for on a 250. I probably will be on the market for a new set this spring, so any advise is welcome.

Guy

[David Lahey]

Guy I think those ones are from Tim's TY175, which he runs with the fork tubes slid down and likes it that way

[Tim Stone]

I use 360mm on my TY250 as well, the steel body (black) Betors have a c-clip that can adjust the preload of the spring, currently they are on the second clip groove from the bottom but I will properly run it in the furthest clip groove. They feel good though.

[Tim Stone]

seals for Betor shocks

SAM_2763.JPG (175.64 KiB) Viewed 7934 times

[David Lahey]

Thanks for the part number Tim. I will compare that with Falcon seals sizing

[David Lahey]

Falcons are 12mm 22mm

[Tim Stone]

I think I have got them to a reasonable quality, less oil more air pressure, 30ml 10W oil 50PSI air, screwed the preload up so under the weight of the bike (TY175) they sag about 10mm, my theory is that I only just have enough spring tension combined with air pressure to return the shock to its full extended length whilst holding the bikes weight, the shocks bottom out when I really bounce on it hard, the dampening seams improved (maybe this has something to do with the weight and quantity of oil), they are noisy buy, you can really hear the oil doing its thing. Any way I will try them on a few sections next trial and see how they perform.
If any one knows the original oils quantity and pressure be sure to let me know.

[Kombivan]

could try asking this [email protected] ......Graham
Or ask www.southwestmontesa.com

[yammyty]

40psi is not enough pressure to run betors, try 60-70psi, how are you charging the shocks? You need to be using a charging chuck otherwise you are wasting your time. A clip on or screw on valve will drop your pressure off without you even realising.
The seal type used in betors is high pressure, no compressive spring, without high presume it will leak