DT125R ARCHIVE

dread123 · Moderator

RE: My dt project

Dt Danny · Guru

It's back fired so much it's warped my head so I'm savings cash up and to Norfe it goes

dread123 · Moderator

ummm who's told you that?? they have no idea what they are talking about. if its warped then it will be because of lack of cooling/overheating...not cause of backfire

dread123 · Moderator

told you what it costs to sort..no need to send to anyone!! do it properly and do it once!

i think you knckered a ring or 2..need to strip barrel and look

-- Edited by dread123 on Friday 17th of January 2014 08:27:42 PM

Calum122 · Guru

Danny0112 wrote:
It's back fired so much it's warped my head so I'm savings cash up and to Norfe it goes

Yeah uuhh no. Just no.

Dt Danny · Guru

Yeh I'll have a strip I'm annoyed my self for ****ing it up

Victor · Guru

I think you need to strip it make a video of everything

post it on youtube so we can all take a look

then let people advise you, goodluck

Dt Danny · Guru

I'll get loads of pictures after but my head was so bad my rad was like a exhaust every time I reved gasses shot out of the rad

dread123 · Moderator

are you going to do it properly this time mate? get pictures of the strip down. then you need to get another head gasket-get head/barrel off to grampian to skim- hoping that you havent dmaged your bore/piston in the process of bodging before.
dont listen to the idiots you have been getting to do the last lot of work!! Liam and myself are available!!!

Dt Danny · Guru

Took the advice you lot gave me and its going to be booked in for a head and barrel skim in feb my insurances runs out on the 17th of feb so ill have a major overhaul before i re insure her :D

Victor · Guru

you can skim it yourself with a bit of wet and dry some wd 40 and a flat surface mate

search youtube for how to, it's not hard at all

Calum122 · Guru

NO! Danny just send it off. He's tried countless times but is doing something wrong. Just let someone else sort it. Learn how to do it on a practice engine.

Dt Danny · Guru

yeh well i have no idea what ive done wrong ive followed peoples adivce to the letter and it still goes lol

Calum122 · Guru

Yeah don't blame yourself. It's an easy job but if you fail to do the right technique then you won't get the results younwere expecting. I've done it countless times using the methods explained. Not sure where you were going wrong but as said a spare engine would come in handy just to get the basics down.

Dt Danny · Guru

yeh i think my head is so warped no matter what i do it goes, and im getting raped £25 to fit the gasket :o and £60 for the skim

Dt Danny · Guru

Just an update,
waiting till i get the funds to send the head and barrel off to the shop to be skimmed and installed :)
waiting on a clutch cover
but now some pictures :D

Victor · Guru

some nasty scores there mate might aswell get a rebore while it's at the shop

p.s looks like you got a nice garage there

Dt Danny · Guru

i was thinking about it it looks bad but i dont feel any roughness so might get it honed ( i think thats what i mean) and see from there and thank you it could easy fit 3 or 4 bikes in and it has a piller drill sander and a leather computer chair :D and it is pretty warm in the winter when im working on my bike

Calum122 · Guru

Okay Danny I think you may have misinterpreted the nature of a warped head.

Okay so on a car a warped head can massively distort the head.

A single cylinder two stroke isn't going to warp that much. I'd say yes maybe because you ran it without coolant that you've damaged the barrel.

You need a rebore and piston I'd advise.

Also that circlip is dangerously installed. Don't install them in that position.

Dt Danny · Guru

yeh well this head is not level and when i put a metal rule up to it i can see light through it, and yeh i did run it without coolent but thats what im trying to fix the damage i caused, and i see the circlip im going to spin it around tomorrow. or instead of a rebore i was thinking about buying another barrel and head and getting a piston for that im not sure

cal do you think a skim from a shop would sort it ? and would you suggest getting a new barrel and head or sorting the one i have out ?

dread123 · Moderator

rebore and piston kit is about 50 just do that instead of messing about.

Calum122 · Guru

Firstly how do you know that that rule is a PERFECTLY straight edge???

You don't. I feel as though I'm repeating myself here but you'll want a sheet of glass because the nature of glass is that they're very very flat!

Then using a feeler gauge you can determine that gap tolerances and decide from there whether the head is actually warped.

But put it this way mate. The more you take off the head and cylinder the more you raise the compression. Theoretically there is no limit as to how much you can take off. You can compensate with bottom spacers and thicker head gaskets. More compression is great if you want more power.

It wouldn't have warped by much if at all. It's mainly bigger cc's that will majorly distort heads. A professional job will have it done a piece of piss.

Calum122 · Guru

You know what the problem is with the way that circlip is positioned Danny?

Dt Danny · Guru

yeh the open end of the circlip is where the hole is on the piston it needs turning round like quater of a turn

Calum122 · Guru

That's not the real concern mate. Yes it's a concern. But it's implication is caused by the real problem. a 1/4 turn is not solving the problem.

Dt Danny · Guru

okay then whats the problem with it ?

Calum122 · Guru

You'll learn more if you think about it logically.

Do you understand that the connecting rod stretches and contracts with it's respective cycle. And you have an open ended ring pretty much connected to that rod.

If the rod can stretch and that is a solid piece. Then you can only imagine what an opened ended piece of flimsy metal will do under the same conditions.

If it's seated 90 degrees to the crank then it will distort the circlip and that could close allow the clip to come out.

If the clip is 180 degrees to the crank then it won't contract in a way that it'll close the gap.

Dt Danny · Guru

ahh i get you mate

Dt Danny · Guru

Got my gasket set and a anthena headgasket. also got a clutch cover of deeteemx (think thats how you spell his username lol) but the gasket set i got of yambits the waterpump gasket doesnt fit :/

Dt Danny · Guru

Waiting for the barrel and head to come back from being skimmed (£55 + vat ) but at least i got these ...