YLR Racing

[F5 Dave]

I've got a 1KT reed I think & have just got a manifold from Pete Sales which is a straight mikuni type like on a foulstroke. It will be bolted to a 10mm thick bit of ally with mount holes for reed & manifold rotated so its mount holes fit in the space. That gets my RGV, 32mm square on. I will then finish another for my KX carb which will have a angle bend in it as its a straight carb. Once (if) that is happy I'll try reducing the bend to find out what angle the carb can get away with. Its a compromise, but so is everything on an engine.

[husaberg]

I'm in Palmy so 9 degrees all year round


I forgot that it was a yamaha... that aside I've seen the webpage that shows different reed/manifold options; but can't seem to find it now.
I know its the same reed block as the TZR250 1KT; but I'm looking for manifold that is straight (to enable the use of downdraft RGV/NSR carbs) and one that is 45 degrees that will take the larger MX carbs. was thinking that an adapter plate might be the answer if someone had come up with a simple readily available solution.


PM sent; but yes I've nearly completed the database with/and filters (sh!t load of manual entry and a lack of time); I'll post the whole thing up when finished for everyone to enjoy...

hope it asn't manual entry of the Ryteching site cause i am sure i have that as a Excell.
There may be a reason i was happy for you to do it.?

Yamaha reeds I have more cross references for the reeds and cadges somewhere.



http://4.bp.blogspot.com/_Zpvp6nQo0H...dimensions.JPG
http://www.saltmine.org.uk/shoeman/reedsandcages.htm
http://www.economycycle.com/servlet/.../40/Categories
http://www.akunar.com/MANIFOLDS.htm
this might help also.
http://www.mossbargerracing.com/product1.htm
supposedly also
Stock 700/750 reed valve assemblies are the same as:

Part Number 311-13610-01 now= 10V-13610-01
FITS Following Models:
80-81 IT125
77-79 IT175
76 MX125C YZ175C YZ125X
76-77 YZ125 C D
80- 84 YZ80 G H J K L
78 -83 YZ100 G H J K E F
78 YZ125E
74 and 77 TZ750
72 DT2MX RT2MX
72-73 DT2 DT3 RT2 RT3

these will have a variation from 28mm to 34-36mm odd i would guess.


I can't find the site it was naughty boy then speed demon but this post has screen shots any way of the straight shots much like dave discusses
I posted a link to as British site that has all the foul stroke style inlets plus the measurements on the ESE thread ages ago Oh here.
http://www.allensperformance.co.uk/p...manifolds.html
. But as Dave says a bit of time at a wrecker if there are any left.

Right here is a copy of the TZR race kit Manual for the carb.

It does say as I alluded too earlier to block it off, but has anyone confirmed that the fueling is wrong on the bike as it is now?

If the fueling is ok now. I can't see how it will gain any HP. Unless the fueling is crap at the moment.

I should probably point out this was for this model carb what ever it is and no doubt the Crafty Japanese made a few changes during the model Run.
Maybe Hilly should give us a run-down of the carb jet specs as they are now.
I see the KR250 the Rotary Reed valve original one had similar carbs 28mm downdraft SS mikunis.
So if Hillys carb is off one of these. All bets with regards to jetting are off as the disk valve will probably have a four stroke style Emulsion tube at a guess.

I have posted the rest of the Naughty boy file as I like shiny milled billet stuff mmmm.....shiny

The ex Naughty boy racing site is renamed and is here not a bad site intersting stuff Mainly Yamaha Shame.
http://www.speeddemonracing.com/articles.html

Er Sorry for Clogging your thread with er..Yamahas Mike

[Bert]

"You must spread some Reputation around before giving it to husaberg again."

but anyway; great links Mr Berg.

[Yow Ling]

YLRs new bucket turned up today, rider sorted, a few bits to fix, came with 1/2 a tank of petrol so that should do a few rounds at bears





Kawasaki KBR150

[Kickaha]

It must be special, it's allowed in the "other" garage

[Henk]

I like "the other garage" best reference like that I've come across is a guy that referred to the house as "the front shed" and yes there was a bike in bits in the front room.

[timg]

Very cool Mr Ling. Looks like I'll have to line the pocket of my pet engine man a little more
WALLACE! - more hp please

[Yow Ling]

Very cool Mr Ling. Looks like I'll have to line the pocket of my pet engine man a little more
WALLACE! - more hp please

Remember at school the Supply and demand curves in economics ?
In racing they have the Horsepower and reliability curve, pay him lots, dont forget to get the big end replaced

[Yow Ling]

Trying out an OKO carb, had a 33 Mikuni but maybe a 30 oko will be better? who knows will find out soon




Also been messing with the idea of a dyno for some time, makes sense being able to measure changes when you make them, seems to work for the big teams up in Auckland. its run straight off the chain, at the moment I have 122kg of mass using 2 flywheels off some old diesels, I have been looking at some software and a usb box from Performance Trends logs 2 x rpm and 2 analogs for $500

[husaberg]

Have you seen the flywheels of a Lister stationary motor?
Also have you looked at Burgermans dyno site?
also is that one of thse stacks from Akunar?

[TZ350]

... been messing with the idea of a dyno for some time, makes sense being able to measure changes when you make them ...

Thats looking good, but I am not sure about the vanes though.

Could you add a disk brake, torqe arm and load cell for constant load measurements and to slow the drum down after a run. Its something we are looking to add to ours.

[husaberg]

Thats looking good, but I am not sure about the vanes though.

Could you add a disk brake, torqe arm and load cell for constant load measurements and to slow the drum down after a run. Its something we are looking to add to ours.

I have asked before but why can't/arn't a big electric motor be used to measure HP accurately?

[Grumph]

I have asked before but why can't/arn't a big electric motor be used to measure HP accurately?

It can - but until relatively recently the electronics required to record and convert the readings were the problem.

The classic disc on a reaction frame with torque arm to load cell is very simple to build and easy to read off loadings.
I had one part built years ago but like so many projects never finished....I got instruction from a car tuner/engineer who'd built his own rolling road with the same setup. He claimed - and had the experience to prove it - that a single HQ holden disc and caliper could absorb around 120hp without significant variation in readings in half hour sessions. His rolling road used twin HQ discs and plenty of cooling air flow from electric fans. Operated air over oil with the load cell and a tacho hooked to his computer - basic but it gave repeatable results.

[TZ350]

I have asked before but why can't/arn't a big electric motor be used to measure HP accurately?

When I was a Tec at Auck Uni Eng dept in the 80's they had a Ricardo variable compression engine in the thermo lab that I used for checking the octane rating and calorific value of fuels. The engine drove a generator mounted on gimbles. The generator had a balance (torque) arm which you hung weights on untill the pointers lined up. The power from the generator was dissipated in a bank of air cooled resistors.

These are basically a dynometer with a way of measuring fuel consumption, power output and compression ratio. Using a generator as a load along the lines of the physical law of reaction and equal and opposit reaction for the balance arm and P=I2R from Ohms law for power. All the readings and calculations were done manually.

It could be done with a much bigger generator but when you think of a 2kW bar heater being enough to heat a room then 20-30kW of power from the dyno generator is a lot of heat.

Some pictures of old Ricardo variable compression laboratory engines. Ooops I see I have a very nice BSA bantam racer in there too, I think that was sent to me by Sonic_V.

[TZ350]

More on dynos,





A water and disk brake dyno. The torque arm can easily bear down on a load cell and a shaft encoder used for rpm, then its just a simple calculation in the PC to display HP. An electric generator load could be a similar setup.

Before working at Uni I worked at an Automotive Machine Shop that had a Heenan & Froude water-brake dynamometer. You manually recorded the readings and calculated HP from the Torqe and RPM.

A quick explanation of how to operate a water brake taken from:-

http://www.douglasmotorcycles.net/index.php?topic=604.0

Here we see a Heenan & Froude type DPX1 water-brake dynamometer. Inside the housing is an impeller running in water. The hand wheel controls sluices that increases or decreases the load or friction. The absorbed power is converted into heat and carried away by the water. Partially obscured by the large trumpet at the top is the dial for the spring scale that measures the torque reaction. Not sure when the DPX series first came out, but Heenan & Froude’s first patent for a water-brake was in 1911.



On this side the black rectangular object is one of the torque reaction counterweights, there would be a further stack of additional ones on top of this fixed plate, temporarily removed. At the top is the hand screw for calibrating the scale. The white face dial is a Smiths tachometer for accurately measuring revolutions per minute.



The DPX1 is a rather small dynamometer, capable of absorbing up to 150 horsepower, so was ideal for testing motorcycle engines.


1000 hp Sunbeam the first car to go over 200mph attached to a water brake dyno. Its worth a read.



http://www.localhistory.scit.wlv.ac....eam/1000hp.htm