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December 09, 2023, 09:53:40 AM

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Porting on IT 175 j model

Started by hugoha.vniekerk, November 16, 2023, 05:00:57 AM

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Good day I am new to the forum. My question is that is it worth porting the cylinder on the 175. And how much more power wil you get with porting?

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what power delivery do you want? is it running fine currently? what will it be used for?

adding power somewhere on a 2T for the most part will take some away from elsewhere in the rev range. an example is A desert racer port job will make a bike terrible in the mountains.

Welcome to the forum!
Got pics of your bike?


Good day the bike is currently engine out I have to replace the kickstarter shaft. I want to use bike for more trail riding. I will up load a pic.

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Martin I Henry

Welcome to the group!

Personally I find the power characteristics of the IT175J and K to be perfect for my needs. Messing with the ports will spoil the engine in my opinion. If you need more power, buy an IT250J!

Dave R.


If you want the bike to be more responsive then an easy low cost modification is to fit the reed block from an IT200S (or just the reeds and reed stops). Then, for a bit of effort to jet it, you could fit a flat slide carby; Mikuni TM34 is cheapest and easiest, or TM36 or Lectron PowerJet 36.