Mz Ts 150 tuning

[Kling [DK]]

Hi
I am currently working on trying to tune a Mz TS 150 engine for as much power as i can without having to add new ports. That means polishing the existing ports, maybe modify the shape of the ports, filing down the head for optimal compression, also giving it a expansion chamber exhaust and changing/upgrading the carburetor. This is where i need some help, i think the best way to get more power from the carburetor is to get another one but i have no idea about what would work best for a 2-stroke 150cc engine. Or is there some way i can optimize the existing carburetor. I know that by adding a new one i will most likely need to make a new intake flange but that is something i will just have to deal with. Is there anybody else who has tried to change the carburetor to get more flow and more power? And do you have any ideas to how other ways i also could optimize power? I live in Denmark so everything from blocks to carburetors is not in short supply if you have any idea for some destructive testing
Thank you
Best regards Mathias
(And sorry that im not the best at english, i hope you can still understand it )

[Puffs]

Hi Mathias, welcome!

while trying to get as much power from a rather dated 150cc with standard 11.5HP is not my first choice, I can see how that challenge could be rewarding, if successful. I'd suggest you first have a look at the fountain of wisdom kindly provided by member Blurredman in his ftp://blurredmanswebsite.ddns.net/Vehicle_Documents/, specifically ftp://blurredmanswebsite.ddns.net/Vehic ... ease_2.pdf. Although that applies to the 250cc's, it might give some leads.

On the carb: yes, for maximum power, you probably want to replace the standard 24 N 1-1. The size of 24mm is just too small for maximum power which will then come at much higher revs too). And change the porting, and the exhaust, and the compression chamber, and the piston, and the conrod, and another thing I forgot.

Maybe you'd best get a clear view what it is that you want. Do you want to go for the absolute maximum power, which will come with a narrow power band, high wear & be difficult to ride. Or do you want a broad & high power band? It will peak lower than the first, but might be nicer. But anything you do to the engine will increase fuel consumption & reduce reliability & longevity. Do you want to stick to DDR technology, or would you consider reeds?

[Kling [DK]]

Hello Puffs
Thank for the reply. I think saying: maximum power was a mistake. Its more like a really nice driving engine (A.K.A. a wide(ish) power band) which still has plenty of punch. I think the best way to go on is to set a goal of some kind. I would like a fast revving and accelerating machine with maybe around 20 hp (I have seen someone on yt make 20kw on a ETZ 150 so therefore i think it should be realistic) and with most of the power in a higher rev range (preferably around the 6-8k rpm (right at the point where that sound of everything falling apart comes in )). Also if i modify the ports wont that change the effect of adding a sport exhaust? Does that mean its better to change the ports and make a expansion chamber exhaust myself? Puffs you also mentioned that if you were to do this you would change piston, conrod etc. what parts am i looking for some from other brands or can i get custom made forged stuff? And as a last question can the ports be polished too much because also beeing a rotary engine fan i know that when polishing the intake ports too much can have bad effects because the rotary engine use the intake ports to mix the gas and air and if the ports are too smooth the gas and the air dont mix at all.
Best regards Mathias

[Puffs]

Yes, I think tuning it for the maximum power output would be a mistake, you'd have a narrow power band and too few gears to make use of that. I'd prefer a broad & usable power curve. It requires finding a good match between many parameters. Sorry, I will not tell you what & how, that's for you to decide. Have you read the document I linked to?

Now 20kW = 27HP from a 150cc 2T is a modest target, modern 125cc 2T MX bikes are at 35-38 HP (@11500 RPM). Maybe have a look how they do that. A power valve on the exhaust will be more difficult to make, but reeds on the intake can certainly be done (and together with a longer inlet opening & bigger carb can give quite a benefit). Plus of course porting & a tuned expansion exhaust. Do you want to keep the standard cylindrical header pipe? A tapered one would improve things, but aftermarket expansion exhausts expect the standard header pipe.

For something like this, the challenge & reward is in the journey, not in being at the destination.