Maybe, what widths are they? if they are mags their sizes should be cast into them somewhere, possibly on one of the spokes.....Originally Posted by gatch
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Maybe, what widths are they? if they are mags their sizes should be cast into them somewhere, possibly on one of the spokes.....
2 weird 2 live, 2 rare 2 die.
I'm not sure, none of my manuals have the rim size in. The bike is at work at the mo so I can't tell..
MotoFXR's will rule the world!
Ya may be in the poo if its the same as this..........
Front tyre dimensions: 110/80-17
Rear tyre dimensions: 140/70-17
........dont know of any slick in this size let alone any good rubber (radials).
Its harder to lose weight than gain horsepower.
2 weird 2 live, 2 rare 2 die.
Ye, except the stock front is a 100, not a 110. I don't really care if slicks aren't those size, just want to know if a 120 rear will work on the same rim..
No8 Wire Extraordinaire
Find out what the rim sizes are. will be on the rims. Any more than 2.5 on the front & that will be a problem, chances are it is 2.5. The rear if it takes a 140 will be 4" I guess. will a 120 'work' on it? Well it will fit. It might even seal. But no it won't 'work'.
Don't you look at my accountant.
He's the only one I've got.
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You really must find out the rim widths you have, comparing road tyre sizes with slick tyre sizes does not mean very much as the size of the tyre (say 110-80-17) is the width across the tread, profile height and diameter of the rim its to go on and does not tell you anything very much about the width of rim the manufacturer intended their tyre to be mounted on.
A "120-80-17" tyre means 120mm across the tread, the height of the tyre is 80% of the width and 17 means 17" rim diameter. There is nothing in there about rim width, you have to go to the manufacturer to find out what rim width they recommend for their tyre.
A tall 120 road tyre will usually be mounted on a narrower rim than a low profile 120 racing slick.
GP125 slicks typically use 2.5F and 3.5R rim widths, you need to find out what rim widths you actually have.
Rim widths are measured in decimal inches and the place to measure them is down in between the flanges, inside to inside, not outside to outside.
If you have to get in there and measure them yourself, remember 2.5" is a decimal inch measurement and 2-1/2" is a fractional inch measurement, there is plenty of info and conversion charts on the net for converting between decimal and fractional inches.
A link to Dunlops racing tyre rim guide:- http://www.dunlopracing.com/fitment.pdf
KR149 and KR133 are Dunlops GP125 racing tyres, they are listed at the top of the chart.
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Now that NedKelly is using a total loss battery powered programmable CDI ignition and only needs the trigger coil from the original ignition, we can use the old high voltage coil in the magneto to generate power to recharge his battery. In the picture is a rewound high voltage coil and the Pit Bike rectifier/regulator we are going to use.
Thomas is using a light bulb to simulate the current draw he wants for charging the battery and running an electric water pump. There has to be something like a light bulb drawing current from the generator before you can get a true voltage reading of the generators output. A 12Volt 26/5W tail light bulb with both filaments wired in parallel draws 2.2Amps.
Bucketracer wound a few coils, 400 turns of 0.6 wire gave 28v when it was tried on the bike and 150 turns (all he could get on the bobbin) of 1.0 wire gave 14v ac or 10v DC. The right hand volt meter shows the ac voltage from the generator going into the rectifier/regulator and the other the dc voltage output to the light bulb.
Unfortunately 1.0mm wire is too thick to get any more turns onto the bobbin and 0.6 is too light to carry the current needed, so off to the shop Monday for some 0.8 wire to make another coil with about 200 turns.
The Pit Bike rectifier/regulator cost $15 of Trademe, the Red wire is battery positive, Green is Earth, Violet and Pink are Generator AC. A little bit on AC/DC http://www.kpsec.freeuk.com/powersup.htm
It might take a few attempts but by a bit of trial and error we will find the right number of turns for 13-14v dc for charging the battery at 6-11,000 rpm.
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An interesting collection of links….. http://31k-gr.blogspot.com/2009/02/blog-post_18.html
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Turbocharged 2-Strokes......I have often wondered if this could be done with a bike motor....now we know.......its great what you can find out about on the net.............
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Sorry Teezee, but this is nothing new...
Small English article
http://www.motorbase.com/auctionlot/by-id/1706703174/
A short youtube video of the " DKW ladepumpe Singendsäge" ("super charged singing saw")
http://www.youtube.com/watch?v=Satfp...eature=related
The bike is circa 1934 I think (pre roots blower)
They (DKW) supercharged a few different models, but finding images of the roots style super chargers is difficult.
A good (English) book to read is "Mick Walkers German racing motorcycles".
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True, supercharging is not new....but which old 2-stroke motorcycle you are referring to was turbo charged?..........turbo charging was the point.......
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I guess I got a bit distracted.
As far as I know, MZ was the leader in Turbo charged strokers, and from memory it was 1956?, not 100% certain on that, next time I go to Zwickau I will find out.
As far as modern day stuff goes, the 1/4 mile guys seem to have it down to a fine art (I think Kawasaki triple based engines is the go)
There is plenty of information on 2 stroke Turbo's and superchargers, but I personally don't know of any in English.
I have seen dozens of Turbo Vespa's, (all I have seen are the big frame 210cc or more) there is step by step information you can follow to make your own.
Forum whore
Between the wars MZ had a racing 2-stroke that was supercharged by a top hat piston arrangement, ......typically it was banned for being to clever........
A "Turbo Charged" MZ 2-stroke motorcycle in the 50's, I don't think so, but if there was one I would like to know more..........
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Another clever engine, the Honda 4 cylinder V8..........
Designed to increase the valve area by getting around the rules limiting race engines to 4 cylinders, the engineers must have been bucket racers in a former life.
Forum whore
In 1965 Kreidler had a 50cc TURBO CHARGED 2 stroke that took the world 50cc world speed record 225km/h
http://www.myvideo.at/watch/3468062/...ccm_Kompressor
They also made a gp racer too
http://www.kreidler-museum.de/kreidler-werksmuseum.htm
They also had super charged models being developed at the same time, and I think one or two had world records.
I assure you, plenty of other European factories where developing Turbo 2 strokes at the same time, as far back as the early 50's.
Also
http://www.kreidler-archiv.de/index.htm
No real information available on the specifics...... but there is plenty of information on turbo Vespa's......
AUDI (who own NSU among others have 2 (working) examples of turbo NSU 2 strokes from the 50's, as well as plenty of other bits and bobs.
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