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Beta Forum My bike is Beta than yours!

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  #1  
Old 18-12-2018
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2018 RR300 ring change

Anecdotally, Iíve heard a lot of Beta 2-t owners have left their top ends for up to 120 hours between changes. I read yesterday of a bloke in Europe with 300 hours on a top end and 600 hours on the motor, a Ď13 RR300.

After checking with a very well-regarded motorcycle mechanic mate I ride with (P.C. Gas Gas) & having never left a top end for more than 55 hours, I thought Iíd open the bike up and have a look. It was recommended I check the piston spec & ring gap. It was said fresh rings at least would enhance the service life of the bore and maintain performance.

As some Beta 2-t owners have had oi malfunctions & some just donít trust the system, I was most curious to see how the oil injection had left my piston, rings, barrel & crank after 60 hours.

After removing the head* & barrel, I was pleasantly surprised. The barrel is in top shape, clean as a whistle. The power valve had minor carbon build up that came away easily. The head had a tiny amount of soft carbon on it, too - it wiped off with a rag.
I then measured the piston (ĎBí size) on the mike & using the manualís instructions; 71.95mm - in the middle of the manual service measurements. Then the ring gap - 0.4mm; at the end of the recommended service life. The rod has zero up & down play and the crank is lubed nicely. I use Motul 710.

Other stats - squish; was 2.04mm, base gasket was a 0.6mm.
The new base gasket is a 0.3mm, giving me a squish of 1.74mm. I should get a smidge more bottom end (all I use, really).

Outcome - I just replaced the rings this time. They are $75 per pair & a Beta top end kit is $294. I will do a piston & rings at 120 hours. Torqued it all up, coolant in, head stay on, seat & tank on, fired up first stab. Love that feeling

Iíve had 2 xRR300ís now & I find the Betaís easy to work on, really well put together & reliable. Just what a 2-t is supposed to be! I am also REALLY happy to report my oi appears to be functioning as per design so far.

* Due to Euro 4 restrictions, the head has 1 x 6mm security hex bolt. As the frame clearance wasnít enough to get my impact driver onto the bit, I got creative by inserting the 6.3mm drive end of the security hex bit into a 1/4 inch socket ($5), and then onto the torque wrench.
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Old 18-12-2018
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What's this head bolt you speak of?
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Old 19-12-2018
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Quote:
Originally Posted by shawbagga View Post
What's this head bolt you speak of?
This is it - note evidence of attempts to use vice-grips to spin it off. I reckon it was easily over 27Nm..
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Old 19-12-2018
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What does it do? Some sort of sensor go in there?
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Old 19-12-2018
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Tamper proof, as is 1 extra on the rhs p/v cover.
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Old 19-12-2018
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Euro 4 regs, tamper proof bolts on intake manifold, head and PV cover
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Old 19-12-2018
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What? But you have to get that security bolt off to do a top end change?
What stupid moron thought that was a clever idea?

They trying to make it 'too hard' for the home DIY'er?
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Old 19-12-2018
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Quote:
Originally Posted by Pygmygod View Post
What? But you have to get that security bolt off to do a top end change?
What stupid moron thought that was a clever idea?

They trying to make it 'too hard' for the home DIY'er?
No, PG - the lab coat-wearing eggheads in The Hague must think we are going to soup up our single cylinder, 2 stroke off road motorcycles - which we use sparingly in the context of most ICE users - so much that it will increase particulate pollution enough to offset the extra brown coal burnt to make the power that ran the computers that did the sums to design, cost & manufacture the security bolts in the first place.

A $5, 1/4 inch Sidchrome socket fixed everything
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Old 20-12-2018
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Quote:
Originally Posted by gibnut View Post
No, PG - the lab coat-wearing eggheads in The Hague must think we are going to soup up our single cylinder, 2 stroke off road motorcycles - which we use sparingly in the context of most ICE users - so much that it will increase particulate pollution enough to offset the extra brown coal burnt to make the power that ran the computers that did the sums to design, cost & manufacture the security bolts in the first place.
Suddenly, Brexit makes complete sense..
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Old 22-12-2018
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3 hours on the bike this morning with the Woogster (Ď18 EC300) & my motor loves a lower squish, lower gearing & new rings. Itís quieter, smoother and has more bottom end.

14/50 with the lower primary gearing on the Ď18 feels just right for the motor for our terrain, which is rocky s/t, pinches & some more rocks.

Really happy with the oc fork - itís pretty bloody good for povo gear! Star Cross 5 medium is a nice front tyre, too.

Noice!
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