The Bucket Foundry

[Flettner]

This 3D lark is easy
TT 500 covers anyone?

[F5 Dave]

Thanks but I sold mine in 1990.

[Flettner]

Thanks but I sold mine in 1990.

No I'm not marketing these, I made them for a friend of mine who has an HL (TT 500 engine).
Why did you sell the only decient fourstroke Yamaha ever made?
I rode mine for the first time in years, took the kick start off so I wouldn't be tempted to kick start it, push start with decompressor. That would be all I need one big backfire and another trip to the hospital. As you will probably remember they are a strangely fun bike to ride.
Meagan and I were practicing for the four hour last weekend and being that the YZ and TT are the only two bikes I own, that run, I drew the short straw, never the less we had a good days riding.
Truth is my (HL) friend drew these covers and my worker Phillip made them so I had sod all to do with them, Phillip made a good job I thought.

[husaberg]

No I'm not marketing these, I made them for a friend of mine who has an HL (TT 500 engine).
Why did you sell the only decient fourstroke Yamaha ever made?
I rode mine for the first time in years, took the kick start off so I wouldn't be tempted to kick start it, push start with decompressor. That would be all I need one big backfire and another trip to the hospital. As you will probably remember they are a strangely fun bike to ride.
Meagan and I were practicing for the four hour last weekend and being that the YZ and TT are the only two bikes I own that run I drew the short straw, never the less we had a good days riding.
Truth is my (HL) friend drew these covers and my worker Phillip made them so I had sod all to do with them, Phillip made a good job I thought.

You paid Philips wages though Neil, so you do kind of own him.

[Flettner]

Three port FOS proceeding, changed the hardener colour for you Husa.

[husaberg]

Three port FOS proceeding, changed the hardener colour for you Husa.

I think that cements our relationship Neil.
Actually what bottom end is that going onto?

[Flettner]

I think that cements our relationship Neil.
Actually what bottom end is that going onto?

Sleeve valve bottom end with a different crank ( shorter stroke and wider to take up the extra space), no fancy Ryger type crank cases just yet.
So it will fit in the same YZF 250 frame.
51mm stroke, 50.9mm bore ( Strike piston ).

[husaberg]

Sleeve valve bottom end with a different crank ( shorter stroke and wider to take up the extra space), no fancy Ryger type crank cases just yet.
So it will fit in the same YZF 250 frame.
51mm stroke, 50.9mm bore ( Strike piston ).

A 100cc kart one?
Those small bore KT100 (can't remember the letters)ones have a real low gudgeon location like a Villiers.
Ken will add the details.
Or are you going to use one of the Italian Kart pistons Ken also Sells?

Ok J is the small bore one and S is the bore common 52mm plus one.
J for Junior S for Senior?

This is the J piston. Photos from Yow Ling.

[F5 Dave]

=Flettner;1130916774]No Im not marketing these, I made them for a friend of mine who has an HL (TT 500 engine).
Why did you sell the only decient fourstroke Yamaha ever made?
I rode mine for the first time in years, took the kick start off so I wouldn't be tempted to kick start it, push start with decompressor. That would be all I need one big backfire and another trip to the hospital. As you will probably remember they are a strangely fun bike to ride.
Meagan and I were practicing for the four hour last weekend and being that the YZ and TT are the only two bikes I own, that run, I drew the short straw, never the less we had a good days riding.
Truth is my (HL) friend drew these covers and my worker Phillip made them so I had sod all to do with them, Phillip made a good job I thought.

Well i sold my 750SP, that was ok too, but needed funds for the 2 stroke project.

Not sure I did get kickback on the TT, but the thought of going back to the hospital doesn't appeal, I've only left there earlier today getting some titanium work removed.

[ken seeber]

A 100cc kart one?
J for Junior S for Senior?

This is the J piston. Photos from Yow Ling.

Husa, spot on as usual. Yep, the J (KT100J) seemingly unique to Oz, has a long compression height compared to the S engine (approx. 33.5 cf 23).

Dunno how you do it, finding all this info. A mental telepathic connection to some powerful search engine? A USB port in the side of your head with a cable connected directly to Mr Google, although by now you are probably WiFi(ed) or fibre optic(ted)?

Irrespective:

[Frits Overmars]

Dunno how you do it, finding all this info. A USB port in the side of your head with a cable connected directly to Mr Google, although by now you are probably WiFi(ed) or fibre optic(ted)?

..........

[husaberg]

Husa, spot on as usual. Yep, the J (KT100J) seemingly unique to Oz, has a long compression height compared to the S engine (approx. 33.5 cf 23).

Dunno how you do it, finding all this info. A mental telepathic connection to some powerful search engine? A USB port in the side of your head with a cable connected directly to Mr Google, although by now you are probably WiFi(ed) or fibre optic(ted)?

Irrespective:

So why did Yamaha design another engine when they already had the KT100S (Because they could I guess) was the rest of the engine other than the top end different?
Alas no wifi usb subport, I have a ability to recall obscure irrelevant information yet struggle to recall birthdays and adversary's etc etc.
When we seen the Kt100J piston all the two stroke 100cc bucket people thought we had finally a non destroked option but it was unfortunately a bit tall for most.
We are all however highly grateful of the continued production of Strike KT100S 52mm plus options though. the rules have been amended to allow their use with a simple carb restriction

[ken seeber]

So why did Yamaha design another engine when they already had the KT100S (Because they could I guess) was the rest of the engine other than the top end different?

Hooser, the KT100J was based on an industrial engine called the MT110. This was Ø52 * 50, CI barrel, float carb, governed and fan cooled. The J used the same cases, albeit turned down where the cast inner fan cooled shroud was, given a cast iron sleeve (with poor quality precast ports) that was cast into the aluminium finned jacket (tiny single exh port and two small transfers), a 50 mm piston (with a crappy tapered ring) and a Walbro WB3A carb (same as the Ø52 * 46.13 KT100S).
I suppose they chose this construction for the lower performance J engine, because it was cheaper, as it used a number of parts from the higher volume MT110.

[husaberg]

Hooser, the KT100J was based on an industrial engine called the MT110. This was Ø52 * 50, CI barrel, float carb, governed and fan cooled. The J used the same cases, albeit turned down where the cast inner fan cooled shroud was, given a cast iron sleeve (with poor quality precast ports) that was cast into the aluminium finned jacket (tiny single exh port and two small transfers), a 50 mm piston (with a crappy tapered ring) and a Walbro WB3A carb (same as the Ø52 * 46.13 KT100S).
I suppose they chose this construction for the lower performance J engine, because it was cheaper, as it used a number of parts from the higher volume MT110.

The kids class ones here well locally at least used to run an iron horse or something.
Your post reminded me there was also the other rotary valve 100 Yamahas as well.
http://www.vintagekart.4t.com/yamahas.html

Plus a KT100P
http://vintagekarts.com/forum/view_t...265&forum_id=2

I seen this one as well. So what the heck is that carb was it the std on on the Rotary valve KT100?

http://vintagekarts.com/forum/view_t...265&forum_id=2

[polinizei]

Neil can do the shrinkage factor as it varies plus I can't remember but it was something like 1.5 to 2 %. But remember you need to allow a Machining allowance for the finished surfaces like the bore as well.
From memory by internal bore is 49mm vs a finished size of 54mm to allow for casting finish defects and machining plus shrinkage.

I will try 2% for the first shot. The next thing is the mold slope for the fins. A mold slope with 1,5-2,0° is looking very roughly. Is there a chance for unmolding 0.75-1.0° or is this attempt waste of time?