Hello All,

Where can i find a step-by-step guide to remove/replace the top-end of an '07 Rev3 270 in order to add an extra base gasket? A shop manual with torque specs would be helpful.

Cheers, Jersey

If you have a torque wrench. Check the setting of the bolts before you remove them. If your trying to soften the power of the motor some why not retard the ignition a few degres. You may get the drop in power that your looking for without taking the motor apart.

There are only four nuts holding the barrel on, from memory you would have a tricky job getting a socket or torque wrench on to them, even a ring spanner, think they are 12 af nuts, Engine building first rule cleanliness is next to godliness!. May be wise to check exaust packing is good also before lowering compressions and messing with port timings. Chech out Beta forums also good luck.

Maybe add a flywheel weight????

One in eBay now

Thanks to all. Good tip to check the exhaust packing. I'm also considering adding the fly wheel weight. I'm a rank trials beginner & want to ease into this.

I decided to take the motor to my local Beta dealer: Diehl

Hi

I had similar 'issues' with the power delivery of my '08 Rev3 270 and solved it by fitting a low compression head and matched more restricted exhaust mid section.

It made a huge difference. It removed the 'snappyness' and smothed out the bottom end making it far more novice friendly

See pic below the original on the right and the low compression on the left

Crudely measured (syringe and fuel) at 15cc and 22cc

But afraid no idea if or were you can obtain them in your 'neck of the woods'!

Hi

I had similar 'issues' with the power delivery of my '08 Rev3 270 and solved it by fitting a low compression head and matched more restricted exhaust mid section.

It made a huge difference. It removed the 'snappyness' and smothed out the bottom end making it far more novice friendly

But afraid no idea if or were you can obtain them in your 'neck of the woods'!

Very interesting! Who makes the low compression head?

- J

Very interesting! Who makes the low compression head?

- J

I got mine secondhand from a Beta dealer.

But when i tried to sell it on ebay (as i changed to a newer GasGas) the only response i got was people telling me the part didn't exisist - despite the photograph etc - i suspect a futile attempt at getting it cheap!

The no. stamped on the head is 2 352C/1 with 1/2 below, then a pair of number 1's the other side of the plug hole

Cheers

I found dropping the countershaft 1 tooth helped on my '08.

From a post in 2004 by someone named Viking. This should probably be a sticky too.

Tightening torque Rev3:

Shock absorber-Swingarm 45Nm

Shock absorber-Frame 45Nm

Connecting frame rod-frame 23 Nm

Cylinder-Crankcase 20-23 Nm

Primary drive gear 120 Nm

Handlebar 25 Nm

Engine-frame 50 Nm

Swingarm bolt 90 Nm

Front wheel axle 65 Nm

Rear wheel axle 65 Nm

Steering stern bracket 25 Nm

Rear fender bracket 10-15 Nm

Front brake pad 20-23 Nm

Rear brake pad 20-23 Nm

Engine Head-Cylinder nuts 15-16 Nm

Front axle fixing nuts 10 Nm

Flywheel 140 Nm

1 Nm=0,1 kgm

Edited January 16, 201115 yr by Dan Williams

You can consult with Dave on this, but I think getting the flyweight on and setting the timing bacl 2-4 mm on the plate would be much more effective, as addind one gasket does not really do all that much in my experience.