DT125R ARCHIVE

After the bastard thing bogging down and scraping like mad I expected the piston rings to be shattered but after inspection seems like it's seen better days but not too bad

 

 

Piston is obviously getting replaced but what about the barrel? I've never dealt with one before I don't know if this is general wear and tear, needs re honing or a re bore and oversized piston - the sides just seem slightly scored but one of the ports especially looks like it's had small chunks knocked out of it. I've tried to picture them as best as I can.

 

 

 

 

Probably a simple question, but got to learn somewhere

 

Also there was coolant in the cylinder, is this something to worry about? But to be fair it could have been from removing the head.

 

Works for me. I'm on max  re-bore mind, you may not need max, just next one up, but I used the old school TZR piston on mine,  not the newer one. they do differ.

-- Edited by NEV on Friday 10th of August 2012 11:18:51 PM

How come a tzr one?

Not sure what size bore it should be, or just find a company to work it out?

I don't know how I can be sure, yeah I'm glad I stopped tbh looks like it did me a favor by not seizing

Cable was pulling the pump fine, and the bottle was topped up. On the re build I'm replacing it with see a see through hose so I know it will be pumping

Don't trust myself with pre mix tbh, especially if I want to go for a long ride it seems far too much planning and calculating

premix all the way.....oil pumps are poop...... if you still want to use a pump,you can get the parts to rebuild them from yam and not massively expensive. not compared to a top end rebuild anyways 

Mmm good points, but when you brim it and have to then work out how much fuel you have put it xD

Also can you just pour it in? Without mixing it

NEV wrote:

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Yep bang 10litres of petrol in to fill up, plus adding in 250ml of 2t , gets you 100 miles back home, jit works out at 25 ml of 2t per 1 litre of fuel. that gives you a ratio of 40:1.

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 25mm to 1 lt of fuels 25;1 int it nev

my crs used to run at 32;1     32mm of oil per 1 lt of fuel

40;1 would be 40mm of oil to 1 l of juice surely???????????????????????   ha

whys that piston got windows?

look at harrys piston, its got windows in it

Not going to lie - I'm lost now haha

So what should I get, a re bore and a TZR over sized piston? Don't want to be buying the wrong things

ye the skirts won't match the transfers either, probably not running its best

Now I've had this convo before in here Gadge, it's something to do with higher compression than the DT one,

It bogged down if you got it to 80 and let off the throttle until it got down to about 70mph

Wouldn't be surprised if it hasn't been done right before.

So I would just give it to a specialist and say I need it the next size up, or do I have to find out the current size and what it needs going up to myself?

ooh and get the cylinder and head skimmed too,it'll give an awesome seal for your new genuine head gasket