My long time friend the pransing horse

[Tioli]

Slide cutaway 2.5, 2, 1.5, mod 1 from a 1.5

1

Everything from the 24 has to be transferred over to the 26.

24 and 26.

The reason for the smaller cutaway is it forces the incoming air to travel faster over the Venturi on the emulsion tube which makes it suck harder and therefore richer. The ratio of air fuel is not changed just more of it which has been frustrating me in my inability to control it. Now that may change

First run on the new 26
Full bell mouth mod
Main air jet - 2mm
DT emulsion tube 5 hole float bowl jet type
Main jet 360
Pilot jet 225
Cutaway #1
TY175 comp needle clip 3
Pilot air jet turns?

New 26 settings first run

Didn't even get it out for a run. It idles to high. There is slack in the cable but can't bring it down. Took the carb out and painted the base with whiteboard marker and closed it and wiggled to see where it rubs. Seems I could put more chamfer on it the rest looks ok.

Trim

Trimmed and cleaned up

Sand smooth

Now closes as good as a standard one. Not that there was much difference. If this doesn't work I will have to counter trim it as it must be sucking air in small amounts from all over sides, pilot, top, choke and idle adjuster which end I replaced with one that has a new oring to seal better

Closes as much as a standard one

Turns out the problem was the cable because of the 1mm I took off the slide the cable is holding it just up a fraction even after I wind all the adjusters in. I fixed it by removing the lock off nut so that the cable could get some slack.

Removed nut

#1 First run its not as good as the 24. The 5 hole emulsion tube never workers as good on the 26 as the TY 2 hole. Seems to work better on the 24 but this could be to drawing harder so it gets its aeration.
Pull it out and change to a 2 hole.

The pilot air adjustment felt like I could go a tad richer from the 22.5 to a 25

Change 1 - 2 hole emulsion tube and 25 pilot jet.

Change 1

The 2 hole is better but the 25 pilot is not
Swaped the #1 cutaway for a 1.5 And you could hear it slurping as soon as it started just muddier. I think the 26mm could do wit a .5 cut away.
This set up is easier to work on than standard

Easier to work on

[Tioli]

Putting the needle to 5th clip makes the 1.5 cutaway better which is where I was at last time. Couldn't get it rich enough lowdown. Now lets see how the 1 cutaway is.

Clip 5 better on 1.5 cutaway.

That was good and makes me think of cutting the slide a bit more to make it a .5.
By changing the needle clip position it helps to work out what to do as cutaway and needle clip position overlap a bit.
The needle is on clip 5 which is the richest and at the end of the range. I will give clip 1 a go just to see

Clip 1 just to see the difference

Shocking really big difference. I'm on the right trail just need to over shoot it and come back to mid settings. Now have to change the cut away to a .5

I have now taken 1.5 mm of the slide length which in turn reduces the cutaway

Took another .5mm off

I think thats about all I could remove or else it will be none.
I will leave the clip 1 position in for the first run to see if it comes back inline.
I'm surprised how much changing the clip position changes the idle setting in theory the two are not in the same range but they are.

.5 cutaway

Same high idle problem I'm going to solve it temperely by not running a rubber washer and later trim the cap thread protrusion back 1mm.

Same problem again

The clip 1 position is better with the .5 cutaway but now the transition from just off idle to 1/4 - 1/3 throttle is very noticeable. (Big hole)

Nice. On the Clip 5 position. I'm out of time to test any more today this has taken 5 hours?
Will need to put the pilot bask to 22.5 possibly even buy a smaller one.

Next test is back to back 24/26 test. If the 24 is better I have my eye on a sweet flat slide smooth boar 24mm. If 24 turns out to be best then why not put in a shmik 24mm that will flow like these old style 26's

Just did another bunch of tests and I largely have my final veridic.

1) If you want instant response from idle then you need the 24mm with the 2 hole emulsion tube 2.5mm TY comp air jet size and .5 - 1 cutterway.

2) if you want a little more midrange but still good off low then go for the JC type emulsion tube. You still need the low cutter ways as its a bigger carb than standard so needs to draw harder. The TY comp air jet feeds the emulsion tube more air that a JC so it's a hybrid between the two.

3) if you want reasonable instant response from idle with really long legs all the way through then go for the 26mm with the 2 hole emulsion tube and a really big jet 400 ish and .5 cutter way.

I did some reading last night and confirmed a suspicion that these carbs have 4 stroke emulsion tubes in them! The design is to have air in the emulsion tube passage and aerate early and well like old 4 strokes like to have. They suck half as often and low down. If you want bottom end out of a 2stroke then you have to do the same. The problem is when you start asking for top end. At some point this system will be sucking to much air mixed in with the fuel and go lean up top. This explains why I have been having this constant problem with getting it rich enough down low then needing large jets up top.

At one point I was going to admit defeat and use the 24mm with the modified standard air box. changing the slide cutterway has changed the fuelling enough for me to stay with the 26. Not quite as good from really low but better everywhere else. I don't think the 26 is suited to a standard air box.

PS. My testing was with a 16T front sprocket second gear on about a 30 degrees incline. If you scale that back to a 13T trials gearing you aren't going to notice any variation apart from the long legs and increased go.

[Tioli]

I think I just about have it.

Just about have it.

I've had some fun getting to know this bike.

Raised the handlebars

Still a lot to learn

Its ready but are the kids.

I'm drawn to a ride on the kwaka
It's perfectly geared for mixed suburban, gravel road and cheeky.
I can take of at the lights and near on pick up the front wheel from stand still, about a foot of the ground to 9000 rpm

My bikes have the spark .

There is always more on the horizon

There is always more.

[Tioli]

Dusk

Dusk

I've been thinking about this bike

Where is the next block.

And I have a few ideas

There is always more if you take the time to look

May have to revisit and take a different perspective

Flip to the other side

It's coming into view

Jumble of ideals

[Tioli]

It's all thereto be see if I just look a little clearer.

Focus in the picture.

The technical will work its self out.

I have the tools

One day the moderators will say "you have used up enough memory". But until then its all about me.

Take it to the next bevel

[Tioli]

Took it down the block and she liked it. Now it has a new direction.

She liked it

I was thinking of restarting from the air leaner to the tip of the exhaust. She liked it so its in to maintain mode. Use but not abuse.

Changed the reeds to both boysens as they are my newest reed should last the longest and the thinned reed cage should last.
Put the 24mm carb back in
Modified standard air filter system
The 24mm body has its main air get drilled out to 2.5.
Using a DT style emulsion tube.
TY float bowl and fuelling system
1.5 'cutaway.
2.25 idle jet
TY needle, clip third position
Starting the main on 210.
All subject to change.

It's a little muddy a (if you said idle was 1000rpm then at 1.500rpm) it's a little muddy. The TY emulsion tube would be better but the trade off is top end. That's why you need such a large main jet for top end. It drawls to much air mixed in with the fuel out the top of the emulsion tube.

The 16t front sprocket may have to go
As its to tight on the chain. I have the adjusters turned to beyond the last smallest position to the smooth section and its still to tight

Old chain lengthened to a smaller front sporect

I'm going to Chang my thinking to the bike lasting and I know what I'm like I would have tuned it to a tight maintained rageme. It's always the same, I tune it to it goes and know-one cam maintain it. They usually blow.

Fix the reeds, 24mm for easier starts and reliability. The 26mm never had a auto lube novel so I drilled it and put in a nozzle. Only problem is I made the hole about 0.2mm to big. So I glued it in with Devcon. Will it last? May not so change it to the 24 which is made with one

Use but not abuse

.

[Tioli]

This is my other trials bike. We have been over some rough terrain that I struggled to keep it upright.

My other Trials bike

Going for a long weekend ride, camp. Which is good on this bike as its registered like i can the TY175JC

I will have to give it a look over and set it up. I could be putting it through its paces.

Set it up for a event

There is no lacking of horse power or torque when this one goes bush.

I have to admit to using a knobby on the front in the stile of racing wet. I gust can't afford the lack of grip my inadequate skills provide. I'm thinking the bash plate is not going to take the weight of the bike.

No slouch in the bush

9000 RPM on the dirt is quite an event and best done in small doses.

[Tioli]

This is what we do with then

Exploring

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Don't recal the last time I had a leach in my neck

I think we are on a old road

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I will be merging into this bike for exploring

My new adventure

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Did a few tweaks to the TY and now am set to use but not abuse

[Tioli]

I seem to have lost my ability to edit?

If I go back to my first post hear.
I restored a JE and had some regrets.
After more than 20 years I still remember that lesson.
Had a chances to make a different choice.

Another choice that I did not have to make. It was obvious

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I haven't really changed it just sort of coated it.
I don't think there is any thing that I would change.
The original owner used it for competition and I have just added my history. I sort of play with them

Still haven't sorted the photos

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[Tioli]

I call this fun

Fun

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I have given this 200 laps on 400. I'm only half way and its my only sheet of 400. The rest are 800 my poor arm

Someone wasn't respectfully

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They are deep scratches going the wrong way