TNT 125/135 engine swap

7305 Views 7 Replies 6 Participants Last post by pedroteruelteodoro, 12 d ago

Vivaldi

Discussion Starter · Aug 29, 2020

Hi all from Spain!

I'm a happy owner of a TNT 125 (in Europe, as you know, we don't have 135cc model) and all is ok, but... i have an idea in my mind and some questions i hope somebody here can respond...

I'm looking to have more power in the engine.
After some time looking on the net, i only found the 155cc with forged piston swap.

but i want more.

the questionis:
Does anyone know about an complete air cooled engine from any other bike with at least 350cc (swap will include ECU, of course) in order to replace the stock one? I undesrtand work can be needed in order to place and fix the engine on the stock frame. That is no problem.

Thanks very much for your help and please, take the next sentence as is: only for avoid responses not usefull for me and other possible interested readers.
I know that:
- this idea is not legal.
- this idea is dangerous.
- this idea is stupid.
- there are lot of other ways without use this idea.

Once again, thanks in advance for your help.

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agush78

· #2 · Nov 5, 2020

Hello mate
Wow 350cc, crazy idea lol. Have you check pitbike engine or klx/crf, dont forget to share the progress, keep it up

Sent from my ASUS_X00TDA using Tapatalk

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Rhyswallis

· #3 · 10 mo ago

from the Uk here ! I chatted to a guy that managed to put a KTM Excf 350 2012 liquid cooled engine in his tnt 125

some of theengine mounts actually fit but he had to weld an extra bit onto the frame for the upper engine mount and mount the liquid cooling system. Looked like a lot of work but if you know what your doing it’s possible !

I am looking for the 155 kit but struggling to find one , if you got the link could you please send it over !

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Engenia

· #4 · 10 mo ago

I like the idea of a "project" - you should see my shed!
What you are proposing is a great project, but if you truly want power, upgrade to a TNT 899 or 1130. Your TNT 350 wouldn't get near either of them.

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Rhyswallis

· #5 · 10 mo ago

i totally would but my age is stopping me sadly I’ve only just turned 19 and going off to Uni soon so will do My A2 license when I can afford but still limited to a bike of 47bhp so my idea is to tune up the tnt 125 to have fun on until I can afford a bigger bike and insurance on a bigger bike is lower as I will be older

plus I absolutely love the size of the tnt 125, small bikes are so much fun!
plus being able to Zoom past all the cocky guys in my area on their duke/yamaha/Honda 125’s on my small little tnt would be so much fun haha

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Engenia

· #6 · 10 mo ago

I was there once too.
You learned early the benefits of a light bike. Some never do.
47 bhp on a 120 kg bike is a serious combination - if you can find it. The standard crop of litre bikes these days is north of 200 kg, unless it's a full blown sports machine. Power to weight ratio is not much better than what you are limited to.

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Elpistom97

· #7 · 8 mo ago

Hi. I was wondering if an engine from a tnt 25 would fit into the tnt 135. I'm looking into getting one and swapping the engine, and for now I have a 250cc benelli engine at hand. So, is it doable ? Easy ? What do I have to modify to the frame ?
And thanks in advance

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pedroteruelteodoro

· #8 · 12 d ago

Elpistom97 said:
Hi. I was wondering if an engine from a tnt 25 would fit into the tnt 135. I'm looking into getting one and swapping the engine, and for now I have a 250cc benelli engine at hand. So, is it doable ? Easy ? What do I have to modify to the frame ?
And thanks in advance

Hi. do you have some update about this?

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