ESE's works engine tuner

[TZ350]

Was the Honda a fully faired RS125?

[Grumph]

Was the Honda a fully faired RS125?

Yes - and wire wheels too...

The morning was foggy and Russ was riding quietly up the road guided by the verges until he could see the group standing by the traps....then he'd nail it....

if it had been clear weather the record set then would be a lot quicker as that was a pretty good RS.
i believe there has been a slightly quicker record set since. Don't think it's in the book as it may have been one way.
From the look of the info on line the organisers are not doing NZ records as they must be two way and the venue plus clocks certified....

The rider who impressed me at those record attempts was Jane Parrett (now Reynolds) who comfortably exceeded the NZ 250 record - 140mph plus - but lost it in the measuring as the TZ owner didn't know the exact stroke and the measurer got it wrong....

[SS90]

Yes - and wire wheels too...

Tif it had been clear weather the record set then would be a lot quicker as that was a pretty good RS.
i believe there has been a slightly quicker record set since. Don't think it's in the book as ...

Im pretty sure it still stands, On more than one occasion Russel said he hoped the record would be broken by a small increment to encourage others to hold the honour )opposed to "smashing"'it and becoming a play ground of financial "elites"

[Kickaha]

Fiddler went to the flying mile or whatever it was near Invergiggle it was with the intention of breaking it, then it rained and got windy and was called off l

[SS90]

Fiddler went to the flying mile or whatever it was near Invergiggle it was with the intention of breaking it, then it rained and got windy and was called off l

I totally forgot about that, like the Jane Parrot story, speed trials attempts the world over are littered with bad luck stories.

[TZ350]

Anyway at the moment my interest is the CVT system. The front pulley is upside down because it sits on the table better that way.

HI all, I am looking for some GY6 125/150 4T CVT parts. I need the shafts that the front and rear CVT sheaves run on.

A would like to buy a ruined GY6 125/150 crank and good rear gearbox input shaft, as I just need the two shafts themselves.

Alternativly I would look at a GY6 125/150 bottom end or complete wrecked engine to get the parts I need.



I have no idea what this is but its those two shafts for a GY6 125/150 that I am after.

Please PM me if you can help.

[koba]

Yes - and wire wheels too...

The morning was foggy and Russ was riding quietly up the road guided by the verges until he could see the group standing by the traps....then he'd nail it....

if it had been clear weather the record set then would be a lot quicker as that was a pretty good RS.
i believe there has been a slightly quicker record set since. Don't think it's in the book as it may have been one way.
From the look of the info on line the organisers are not doing NZ records as they must be two way and the venue plus clocks certified....

The rider who impressed me at those record attempts was Jane Parrett (now Reynolds) who comfortably exceeded the NZ 250 record - 140mph plus - but lost it in the measuring as the TZ owner didn't know the exact stroke and the measurer got it wrong....

Fiddler went to the flying mile or whatever it was near Invergiggle it was with the intention of breaking it, then it rained and got windy and was called off l

Ivan Juggins currently holds the 125cc record, he set it on Murphy's line, just out of Featherston, a few years ago.
It took MNZ ages to officially publish it.
He set it on an average post 95 RS125.

It was on their old website but I can't find it on the new one.
Ages ago (before that record attempt) I e-mailed them and got all the info, after nagging them for it.

The event at Murphy's line was the only one I know of that's met all the criteria for official records to be set.
The road met the requirements for elevation but was too bumpy for the faster bikes, Malcolm Breadmore was seen with his Nitrous Oxide fed Hyabusa a quite far off the ground and doing 300 and something Kph.

[husaberg]

Imagine for a minute how dangerous this could potentially be in the wrong hands.


I must admit i had never seen this before.
ADJUSTABLE MAIN JET FOR KEIHIN CARBURETOR

Eliminates incorrect multiple jet changes when replacing exhaust pipes or air cleaners on all Keihin-equipped models (except CV type) from 1976 thru 1989. Full adjustability permits precise tuning for maximum performance with every combination of engine, pipes and air cleaner. This kit frees you from the limitation of the few fixed jet sizes available and the labor of drilling jets. Use new gaskets and seals when installing. The installation tool marks the float bowl for a proper fit.

Question for the Aprilia types.
I was looking at the RSA and RSW power valves.( below)



Is the second blade just for the inner bade to slide in and out of and how does it move in and out i can't make it out from the parts fiche.
I always thought it was a eccentric or cam operated (Directly on the blade) So is 19 and 12 the levers to that operate the blade?

In comparison the road bike (Rotax powered RS125) seems much simpler (Below)


Was the method of operation to save space? Or two make the control easier on the twin? Or the obvious reason i have likely missed? (like quicker operation)

[Frits Overmars]

The Rotax cylinder only has a single blade. The Aprilias have a two-stage powervalve system: first only the lower blade opens; then it takes the upper blade with it.
The drawing above left is from the RSA manual; the drawing above right is from the RSW manual. In typical Italian fashion the numbering of the parts differs between the two drawings.

RSW (right): When the shaft 7 turns, the lower blade 14 is lifted by the arm 2. When the lower blade hits the upper blade 13, both blades are lifted further together.

RSA (left): When the shaft 14 turns, the lower blade (not numbered) is lifted by the arm 15. When the lower blade hits the upper blade (also not numbered), both blades are lifted further together.

All other parts are to do with spring-loading the blades, converting the cable movement into turning of the shaft and fixing the cables to the cylinder.
In the 250 cc twins the shafts are coupled by push-pull rods which in turn are cable-operated. The 125 cc singles ared directly cable-operated. The picture shows the RSA's cables.

[wobbly]

The idea behind the two stage blade is that with a single PV, as it is retracted it pulls away from the piston.
At 1/2 sroke it is virtually useless due to excessive leakage.
With the two stage as the lower blade retracts, the upper blade is still close to the piston.
At 1/2 stroke the lower blade is sitting flush with the uppers bottom edge.
They then both retract up flush with the roof.
This gives a sealed blade when down at say 100* atdc, and it is still sealed against the piston at 1/2 stroke, say 90* atdc.
This is why the Aprilia PV still works effectively, such that the blades are not fully up at the 80* atdc point till around 12,000rpm.
Exactly the same system in the RZ400, and that PV isnt fully up till 10500, in an engine that peaks at 11500.
The Honda dropping gate or the Yamaha rotary spool valve overcome this by keeping the seal face close to the piston throughout the entire stroke.

[F5 Dave]

Hey TZ,

What do you reckon the beast is capable of in a straight line? Maybe F5 Dave would stand a chance on his 50.

I considered doing Murphys, until I realised that my bike is F5 legal, but speed classes will need to be std bore, ie just under 50cc.

[TZ350]

Hey TZ, What do you reckon the beast is capable of in a straight line?

Thanks for the heads up, it would be a fun thing to do.

I think the Beast as it is could clock 85-95 mph. I know 30hp bikes should go faster but the Beast has a lot of frontal area and I expect a high coefficient of drag to boot.



Maybe if the Beasts engine was in a fully fared RS chassis like NedKellys RS/GP125 Bucket it could crack the Ton. But I can't see a 30hp engine in a RS chassis ever setting a higher speed record than a Honda RS125 race engine can, now if they had an F4 class.....



The 30hp Beast plus rider is 60kg heaver than Rick and his RS/TF combo.



Rick and his low 20's light weight bike have a similar power to weight ratio as the 30hp Beast.

There have been a few suggestions that loosing a couple of hp from the Beast would make it a more competitive bike, but I don't think the idea was well thought through.

Having seen both 30hp (Tokoroa) and 27hp (Taumranui) versions in action and listening to Tim's comments. No matter how smooth the Beasts new reduced power engine might be. I don't think the Beast will ever be able to cut it, with its new and unfavorable power to weight ratio, when pitted against the better handling RS125/TF and 4T's.

It become pretty obvious that the 27 and 30 hp options were both rideable in different ways and that reducing the Beasts power did not make it any faster ...... going fast seems to be more about the power to weight ratio.

Trimming the 30hp Beasts weight for a more competitive power to weight ratio looks like a much more rewarding way to go.

[wobbly]

Now you are onto it TeeZee.
Having 30 RWHp ( say 35 crank ) is only 10 Bar BMEP.
This is NOT pushing any 2T envelope at all, and once you get it sorted it will run sweet and stay that way, all day every day.
At this level it is easily possible to shape the powerband to suit any track configuration you want, ignore the tossers telling you it is "too much " power that is causing problems.

[F5 Dave]

Thanks for the heads up, it would be a fun thing to do.

I think the Beast as it is could clock 85-95 mph. I know 30hp bikes should go faster but the Beast has a lot of frontal area and I expect a high coefficient of drag to boot.
. . .

The unrestricted 125s in UK would just tickle 100mph & were doing about 25/26 at the rear. But they aren't big bikes.

[cotswold]

Now you are onto it TeeZee.
Having 30 RWHp ( say 35 crank ) is only 10 Bar BMEP.
This is NOT pushing any 2T envelope at all, and once you get it sorted it will run sweet and stay that way, all day every day.
At this level it is easily possible to shape the powerband to suit any track configuration you want, ignore the tossers telling you it is "too much " power that is causing problems.

I'm with you Wobbly, the beast is a work in progress and that 30hp motor was not hard to ride at Toke and sure it's had some issues but they are being addressed and once Tee Zee has worked through the problem they seem to stay fixed, ie no repeats once identified, thats called development, We would all be riding Bantams without it.
That motor in a lighter more nimble chassis will be a right up there.....