Gifts to you know who in 2015

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Greg Watters
Posts: 750
Joined: Mon Sep 27, 2004 8:57 pm

Re: Gifts to you know who in 2015

Post by Greg Watters » Tue Apr 14, 2015 7:58 am

Wondered what happened Gary, bad luck indeed , can the tensioner arm be secured or limited in its travel ? or is it more an adjustment in fuel and timing that it does not kick back ?

our offering is not metal , new bodywork did not work for us, giving a speed related wiggle , seems the centre of pressure is too high for our centre of gravity
older style on the 750 that we tried on the busa last day worked much better , but our rushed fit must have been offcentre or had a side wind on track that i could not feel off track as it had a speed related lean
Image

So back to the drawing board

Stayt`ie
Posts: 897
Joined: Fri May 13, 2005 11:47 pm
Location: Mackay

Re: Gifts to you know who in 2015

Post by Stayt`ie » Tue Apr 14, 2015 8:20 am

on the weekend we pulled the motor and our humble contribution this year is one piston,, oiling problem to #2 gudgeon, flogged out a few thou, no worries :roll: ,,
given that we had 30% in the tank and are newbies to this Nitromethane stuff, very happy with the readings of the complete cumbustion chamber, no signs of detonation, :D ,,
going to have the "new" battery checked out, as i feel it was going away causing a voltage drop which resulted in the fuel pressure droping, :evil:
First Australian to ride a motorcycle over 200mph at Bonneville,,,

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BONES
Posts: 352
Joined: Wed Mar 15, 2006 4:28 pm
Location: Killara Sydney

Re: Gifts to you know who in 2015

Post by BONES » Tue Apr 14, 2015 9:53 pm

Dave
Shell M is good -- castor base
20:1 should be fine. I run all my engines at 20:1 castrol 747 and petrol.
Maybe a richer needle?
Alcohol wont loose power if it's a little rich but will detonate if lean.
Lots of guys use alcohol in yamaha air cooled road racers so I would think part throttle should be not a problem if jetted correctly.
Is it maybe worth using some oxygenated petrol to give close to the same power which should be ' more normal' to tune.

How did the cylinder fair? Will a little acid clean it up?

Well I guess 11 months to get it right
cheers Bones

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RGV
Posts: 661
Joined: Sun Feb 06, 2011 9:17 pm
Location: Adelaide Hills

Re: Gifts to you know who in 2015

Post by RGV » Wed Apr 15, 2015 1:22 am

Hey Bones, the cylinder needs a replate, a few scores.

Its been suggested to me by a knowledgeable tuner in England that the needle moving around in the needle jet might cause problems to fuelling so I have now locked mine so they dont wobble.

He also suggested filling in the bottom of the slides to give a better signal in the mid range. You can buy bits of plastic to do the job but im not paying $50 each for them so Ill have a go at making some.

What sort of power increase do you get from the oxygenated petrol? Ive seen some pretty wild claims.

Im going to give methanol another try next year and hopefully get it right this time.

Dave

Last Minute Racing "its a 2-stroke ya twit - Its supposed to smoke"
DLRA #928
SATA #10

2010 MPS/G 250 118 MPH:)
2011 Washed Out:(
2012 Washed Out:(
2013 MPS/G 250 131 MPH (RECORD):)
2014 MPS/G 250 140 MPH (RECORD):)
2015 MPS/F 250 DNF:(

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