ESE's works engine tuner

[wobbly]

The crank press fit at 0.115mm is getting tight for a pin with a big hole thru it.
Reason , the pin will cone downward as it approaches the crank wheels , due to the softer material of the interior , plus the big hole - if you use much more press fit than that.
Best solution is to assemble it , true it , then press in small plugs on each side with the same press fit , un assembled.
This helps to tighten up the press fit grip , and stops the pin ends from crushing inwards and causing the rollers to skid over the curved ( ie not flat ) surface.
Saw this first on old KT100 Yamaha kart engines.

[jbiplane]

The crank press fit at 0.115mm is getting tight...

Thanks for comment. Finally will use press fit 0.075+- 0.005

Any advice related allembly process. Is there any special greases or some other mixture chemicals to simplify assembly and make contact stronger?
Some kind of CRANKSHAFT LOCTITE
I heard zinc coating can improve strength of press connection in times. May be grease with zinc powder will make a job?

[wobbly]

Loctite 620 makes assembly easyer , and it acts as a surface lube long enough to make truing quicker - before it sets anerobically.
I have used it for years after alot of tests to see what effect it actually had , for assembly , then truing , finally seeing how much extra press pressure was needed later to split it apart.

[Pursang]

Loctite 620 makes assembly easyer , and it acts as a surface lube long enough to make truing quicker - before it sets anerobically.
I have used it for years after alot of tests to see what effect it actually had , for assembly , then truing , finally seeing how much extra press pressure was needed later to split it apart.

That's a handy tip, Thanks wobbly.

Cheers! Daryl.

[jbiplane]

Loctite 620 makes assembly easyer...

Hi Wobbly. Thanks, will follow your advice.

[TZ350]

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Paris 1976 https://youtu.be/YeEeyOCJ1OA
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[katinas]

Type 2, the crankcase, transfer tunnels and intake port is a single plenum.
Type 3, the solid barrier creates two plenums, to be less the% of the crankcase, this has better suction power.
Type 4, the reeds become a solid barrier creates two plenums, as the% of the crankcase is greater, it loses suction power

Attachment 345929Attachment 345930Attachment 345931

Hi,
Just played a little with crank space separators and tried another variation, with smaller volume under piston , call it Type 4.3.
Tried to ride again with Type 3, Type 4 and Type 4.3. Engine response to Type 4 and 4.3 very similar- impossible to overcome 5000 rpm in any way in the 1 st gear. Without loading, torque drop very clear seen in the video https://www.youtube.com/watch?v=PsiKnYLnGaE, but both 4 and 4.3 types, can jump over dip.
With Type 3 can ride in normal way, but clearly heard sharp noise, from airbox, just at 4000-6000 rpm interval and leaner mix needed at higher rpm, in comparison with Type 1 and 2.

Add comparison graphs, from Type1 tests with different B port opening time, from 136 to 140, A left unchanged 142. Time between tests 40 min.

[katinas]

https://www.youtube.com/watch?v=4SkyAnVIChE
16.15

21.20 I remember, really like camshaft gear train position on Yamaha M1, but from where it comes .....

[lodgernz]

Husa, do you have any idea of a 6-speed box that would fit a GT100?
Asking for a friend...

[ceci]

Hi,
call it Type 4.3.
Tried to ride again with Type 3, Type 4 and Type 4.3. Engine response to Type 4 and 4.3 very similar- impossible to overcome 5000 rpm in any way in the 1 st gear.

Hi Katinas
That fact of not exceeding 5000 rpm is what attracted me to know his research work, to discover if the TZ350 theory of pressure in the crankcase are true.
He has a huge job with so many types and variations on each type.
Type 1 various opening times port B.
Type 2 and type 2.1
Type 3 and type 3.1
Type 4 and type 4.3
Much and very good work, it is appreciated because it helps a lot to understand what happens inside the 2S engine

[mr bucketracer]

Husa, do you have any idea of a 6-speed box that would fit a GT100?
Asking for a friend...

are you not thinking gt125 twin starting its life as (-;

[lodgernz]

are you not thinking gt125 twin starting its life as (-;

Sorry, I thought you said it was a GT100

[husaberg]

husa, do you have any idea of a 6-speed box that would fit a gt100?
Asking for a friend...

gt100?.............

[mr bucketracer]

Sorry, I thought you said it was a GT100

it is now but as that's no such thing . It started as a gt125 twin

[F5 Dave]

Don't mention the watercooled MB50 barrels.


It's been so long ago I cant remember rightly who built that. Red leathers perhaps. I'm getting Phill Bird on the ouiji board, but I'm not even sure I can remember such a person so that's likely wrong.