4RT Clutch Actuation?

[mcman56]

18 hours ago, Tr1AL said:

The 4RT 301RR makes  a pathetic 16.3 HP , 1 HP more than a VERTIGO 125   but the 301RR puts out 15.1 ft/lbs torque  , where as the VERTIGO 125 makes 8.8 ft/lbs . With that much torque output of the 301 it may be better leaving it with the stock clutch spring set up.

4RT 260 makes 15.6 HP and 13.4 ft/lbs torque

Are HP and torque numbers available for the standard Beta 300 4t, maybe with rpm numbers?  I have one of those too.  In a tight section, the Montesa feels much more powerful so I need to use very little throttle.  I thought it was overall more powerful.  However, the other day I took it to some open trails with good size hills.  There it feels similar to the Beta.  I wonder if there is a real power difference or if the fuel injection just makes it more responsive.  

[lemur]

The problem you are noting with the Beta 4T throttle response is they fitted the bike with a CV carburetor. Vacuum operated carburetors rob engine intake vacuum pressure to operate the carburetor negatively effecting both the throttle response and the engine performance, in PGM-Fi fuel systems 100% of the engine vacuum pressure is dedicated to intake of air & fuel, Fi does not exhibit the throttle lag and occasional misfires inherent to the CV carbs normal operation.  

[mcman56]

On 11/15/2025 at 5:24 AM, lineaway said:

The plate holds the springs straight. They other wise rub

on the towers. The springs are much lighter. Available from Webike.

Why do they rub?  Do the springs have a smaller inside diameter?  Is the plate just slightly thicker with the groove to center the springs.

[lemur]

Want to know what will happen after you put lighter pressure plate springs then required in your clutch <- it's going to slip in high gear ranges, same as if you leave 2 of the 6 springs out.