ESE's works engine tuner

[Frits Overmars]

Maybe a fair comparison would be a Moto 3 single with the Honda RS125 they replaced. Looking at them, I think the 2-stroke still has less parts and made more power per liter...

More than double the power per liter.

[F5 Dave]

Well here's my latest project-ette.

I've borrowed RA dentist tools before & they can do the job but very slowly as they have micro bits.

I came across new old school (sorry I hate that expression) dentist drills that are lower speed but rotary driven & with bigger bits. Maybe I figured I could drive one from my dremel flexidrive & use these diamond bits I bought years ago in the chance that I could find something like this.

Good RA cutters small enough to fit in 50cc barrels or even 100s are more $ than I can justify. So how much for the dentist drill head brand new? Surely more? $25NZ landed to door. Yep that's right, free shipping ebay special.

OK so all was not simple dimple. How to interface the drive for a start. I made a fugly holder out of the end section of a diffuser & welded it to a bit of steel that was tapped (thanks Mike) to fit the dremel flexi (1/2" unf or some crazy tap I didn't have).

The other issue is the bits I'd bought were bigger shank than they said they were so I got a chap to turn them down (my lathe was too big), machine a retainer groove & a flat.

First try out tonight. It spins & is easy to use, but the bits aren't much chop, may have to sacrifice some tungsten dremel ones & the drive started slipping but I had a bent ended old bit to drive the coupling, I really need to weld a decent mating bit to slip into the coupling. Will update how sucessful this all is.

[Drew]

Maybe a fair comparison would be a Moto 3 single with the Honda RS125 they replaced.

Looking at them, I think the 2-stroke still has less parts and made more power per liter, whats your thoughts?

More than double the power per liter.

I'm not arguing that the four stroke is superior, was just saying it was a tad unfair to the diesel to picture them such.

I have a two stroke, it just happens to be shit.

[richban]

I'm not arguing that the four stroke is superior, was just saying it was a tad unfair to the diesel to picture them such.

I have a two stroke, it just happens to be shit.

Also the last picture is not the KTM moto3 engine. Its the dirt engine they were talking about in the press when the class was first announced. Not to pedantic for yah.

[FastFred]

it looks like one carb was opened first then when the rev's were up I guess the other side with the radical timing was opened for top end and over rev.

Almost a rotary valve version of Frits's swing up out of the way at resonance 24-7 reed valve concept.

[FastFred]

just saying it was a tad unfair to the diesel to picture them such.

Maybe not, if you are comparing the effort a 4-stroke has to go to to be competitive with the same size 2-stroke.

[FastFred]

I have a two stroke, it just happens to be shit.

Here is your chance, apply some skillful talent and unshit it.

[F5 Dave]

Unshit it. Nice turn of phrase. But alas, if he did that; what else would he have to complain about?

. . . oh right. pretty much everything.

[Drew]

Here is your chance, apply some skillful talent and unshit it.

Got another guy's pipe dimensions. That and some time on the rolling road to tune it should considerably unshit it.

Unshit it. Nice turn of phrase. But alas, if he did that; what else would he have to complain about?

. . . oh right. pretty much everything.

I'm just misunderstood.

[FastFred]

I'm just misunderstood.

True.

Got another guy's pipe dimensions. That and some time on the rolling road to tune it should considerably unshit it.

I have a soft spot for the Suzuki GT125, please keep us posted.

[Drew]

True.



I have a soft spot for the Suzuki GT125, please keep us posted.

There's a thread about my bike. The stuff I'm doing doesn't really warrant being in this thread.

[husaberg]

I'm not arguing that the four stroke is superior, was just saying it was a tad unfair to the diesel to picture them such.

I have a two stroke, it just happens to be shit.

Nah ya not getting off that easy, no way.
You you wanted me, instead of comparing 60's 4 stroke GP bike to a 60's 2 stroke gp bike engine. You wanted me to compare a 2000's gp 2 stroke to a mx motor that had been forced on the gp fields (to save money haha) One that was twice the size more costly to run heavier and slower.....ok you are right Drew..........

Morbidelli 500

Right first up, Rossi Yes he is his dad. Talent i guess riding talent runs in the family.
The rest maybe our European corespondents can add to?

[Drew]

Nah ya not getting off that easy, no way.
You you wanted me, instead of comparing 60's 4 stroke GP bike to a 60's 2 stroke gp bike engine. You wanted me to compare a 2000's gp 2 stroke to a mx motor that had been forced on the gp fields (to save money haha) One that was twice the size more costly to run heavier and slower.....ok you are right Drew..........

Don't make me sully a properly educational thread with my stupidity man!

[husaberg]

Don't make me sully a properly educational thread with my stupidity man!

Actually you make a great point when was the last time a 4 stroke won a world championship on an equal footing since the mid 70's.MV 500's
I can think only of the open MX class maybe enduros as well. 1995-2002 ish.

Although the Husaberg's did have a 2 stroke based bottom end, at least at first.Plus no one was making a serious open class mx 2 stroke by then anyway.

350 Scott racer 1966

Not as modern as the Morbidelli 500 above but the i think the inlet pictured on the last page is interesting. Had me fooled for a while.
The date is a typo the engine was designed in 1964.
You do have to wonder why the Birmingham "Holder" Scott Squirrel road bikes were liquid cooled yet the racer was to be air cooled, Fashion?

[chrisc]

Last thing you want to do is encourage an anorak.
Yes a few more left.
Including a very interesting gearbox configuration on a works Kreidler 50cc.
The suzuki 50cc here has an Alloy frame (always wondered why Suzuki's welding was so chunky)
Updraft on the carbs and also note the shape of the crank-wheels.
I have always thought the 60's Suzuki's were functionally pretty.
oh yeah the carbs in thew last 50cc twin nearly bigger than what you are allowed on the Air cooled 125 Rob.
In fairness your power spread is a little wider though

I saw this in the August 2012 issue of Classic Bikes, page 65 if anyone wants to check it out for a similar read