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Tortrons GN


tortron

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  • 2 months later...

Happy little accident. Ordered some gn125 indicators off aliexpress, they arrived and are about 1/3 the size they should be. So I'm taking the originals off the advgn, painting them black, and putting them on another bike. 

So that means the GN gets small indicators. 

 

Originals

IMG_20210513_134432.thumb.jpg.a484631aa393793b76d74e36d9510dac.jpgIMG_20210513_134353.thumb.jpg.98960407bf3977e503e7f6174362d279.jpg

Massive  914g

 

New ones 

220g

IMG_20210513_134407.thumb.jpg.25ffc69182f03458ec0cdf7b65af9056.jpg

IMG_20210513_134416.thumb.jpg.c420199e77ffb67f5917818509042443.jpg

 

Looks OK (can't bring myself to say a GN looks good) 

Quite a bit of weight off it now without really doing anything

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i lost like 4kg from swapping in the lithium battery. so with the rear wheel swap, indicators, guard chop, and tail light swap, oh and im sure my pannier rack is lighter than the stock one, i must be doing alright.

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  • 1 year later...
  • 2 months later...

Dug out my least broken dr125 parts bin

Screenshot_20221027_165040_com.android.gallery3d.thumb.jpg.cb3a393f1d64a104699d590956653c26.jpgScreenshot_20221027_165044_com.android.gallery3d.thumb.jpg.e8c148b175b0445aa0f82a99c3cc6a7d.jpg

Thought it was just really dirty, but it's actually coated inside and out with a factory black coating. Even still there in the combustion chamber and exhaust port. I cleaned up the outside a bit more and it was suzuki bronze under the black, but I think they all came out black. 

 

GN125 valves on the left, dr125 valves on the right

Screenshot_20221027_165054_com.android.gallery3d.thumb.jpg.29c008cfc5b6153a51803c547adbac01.jpg

5.5mm stem vs 5mm stem on gn

30/26 vs 25.5/22.5 diam 

 

Also check out these valve springs

Screenshot_20221027_165050_com.android.gallery3d.thumb.jpg.a41ea1cc9ace50f690a1f25ea25db63f.jpg

 

They are way bigger/thicker than then GN. I can take the GN125 ones off by hand, just pressing down on them with something. The dr125 ones took quite a bit of force with a valve spring compressor to get the collects out. Not surprised guys say just run the outer spring

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There was zero damage to the piston, just banana valves. 

Dr head has no squish bands so it's big bore not flat even tho they say piston compatible, I will actually use a high some piston for it to increase comp. 

 

Will see how this set up goes. Next is pumper flatslide from DR200 and exhaust that's not got a hidden tiny exhaust inside it

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  • 3 weeks later...

150kit, big cam, and dr125 head

Single base gasket, single layer metal headgasket

 

Have to take a bit out of thr intake valve pocket, I had already taken some out of the exhaust. 

IMG_20221118_125354.thumb.jpg.139402b6a9900e117507f886cad22530.jpg

 

Compression will be fairly low. There was a run of custom pistons for exactly this set up, a guy offered me a left over one a while ago, was quite a high compression. 

I will ride like this I think and see how it goes. I didn't want to lock myself into just 148ccs when if I change the conrod I have way more options

 

 

Tried the big dome piston and won't work either. Deck height is above the head gasket. Needs a 4ish mm base spacer, which I might also make up on a spare engine, if the dome can be modded a little to clear the valves it might be an alright setup

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IMG_20221118_154618.thumb.jpg.10491f7422ec6683e99f098c83e08de2.jpg

 

The piston with the taller deck might be for egr heads, Ali express seller says they are for the barrels with egr (the boss is visible on the front of the barrel there). I have never looked into that set up, but if that's the case the head must be more open 

 

Gotta put the stator side back together and drop the sump strainer to see how many spiders are in it

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Possible conrod swap for other piston options 

Gn125

1102714563_images(46).jpeg.b98b1fe7383fedb7ebbf5bd877d3e9be.jpeg

Screenshot_20221123_114605_com.android.chrome.thumb.jpg.5848dfbfe4a8cd2880f2c75ac31951fc.jpg

 

 

Xr200

va-1012.gif.ff1c44b92af86845576928fa52efade9.gif.554551195cabb29bb590c78ac92f8dc7.gif

 

 

Ran some numbers on dr125 head (Internet says 21.5cc) with some Honda 65.5 & 67mm flat top pistons (14mm pin) and compression ratio would come in just under 8:1

Kinda wants something with a popup dome on it

 

$300 for a wiseco 140cc 11:1 piston. It probably goes pretty well

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