DT125R ARCHIVE

careful because it might not be that

it might be the actual heat of the engine..
its freshly rebuilt its tighter than a nun in there....

Cheerz lads, its stopped doing it now so will see how it goes!! lol


hahaha woll! i am actually thinking about takin em off now!!

Problem got worse today when i started losing water from out the frame by the stand (overflow) and my temps went up and stayed up. I cut the bike out before it went into the red and checked the rad which i needed to top up, i only checked the other day and it was full so i was defo losing water. Was exactly the same symptoms as when my head gasket went 2 months ago which i replaced.

I started the bike up without the rad cap on and once it had warmed up and the water started to go round the system i noticed loads of little air bubbles in the rad. I ran it untill there were no more air bubbles and took it for a spin. Its fine now so it must have been an airlock causing the problem.

Thought id update the thread so it mite be of some help in the future 

Turns out it is the head gasket. Losing water, pressure coming out of rad when open rad cap and water dripping out the overflow by the kick stand.

A new head gasket was fitted around 5 weeks / 500 miles ago. Have ordered a gasket set and am gonna fit a new head gasket. Dont know why the old one only lasted that short ov time tho.

pattern. are they really that bad?

Always , always always buy genuine gaskets !!!!

best keep your fingeres crossed :D.

i spose some pattern ones should be ok but you are taking a risk not using genuine parts, my clutch cover gasket has gone aswell got a friend doing it for me 2moro

yeah i went to the main bike dealer in bristol (fowlers) and i paid £11.20 i think no more than £12 anyway

dont recomend it but on my dt i trued the head and barrel and bolted them together with copper silicone hasnt used a drop of water 6000 miles

what are pepoles opinions on the overflow bottle i removed mine and just have a pipe of the rad pointing down ?

PISSED OFF!!

I think the new head gasket has failed again. Ive done 120 miles since i fitted the new gasket on sat. Went on a 80 mile hoon on sunday and was all good. This morning i noticed a tiny drip out the overflow again (wasnt overheating) but this evening it got way worse and started to overheat so i stopped. I filled the rad back up, left the rad cap off and started the bike and the coolant level then started to raise and oveflowed out the rad. I put the cap back on and the oveflow started running again. This is slightly different to before as the rad never oveflowed.


Gonna order a gen yammy head gasket 2moz at work, then gonna get strip the head off after work and get the head skimmed at PJME some time this week so hopefully can get it back up and running by the weekend.

My bike is my only form of transport so want it back up and running as soon as possible, last 2 times the head gasket has failed ive been able to top the rad up each morning to get me by but this time its pumping most of the coolant out the overflow in like 5 mins. Must be leaking a lot more this time due to it losing coolant way quicker and it making the rad overflow when it didnt before.

Do you lot think it sounds like the head gasket again?? Its gotta be surely!!

Cheerz for the reply malc. The waterpump is working fine, also thermostat is all good have tested in a kettle.

The rad cap is pressurising aswell as when i take the cap off it releases pressure so it must be holding pressure in.

Tried running it without the rad cap on but instead off running out the overflow the water level in the rad rose and it overflowed out there!!

Have stripped the head off 2nite after work and it has leaked in the same place as the last one right at the front off the gasket opposite to the UP tab, its defo the gasket at fault.

Im dropping the head to PJME tommorow at 2 o clock to have it skimmed which is £15+VAT and have ordered a gen yammy head gasket today from a dealer which was £11.29.

Should have the head back and gasket by end off the week.

Cheerz for your help Malc will keep you informed. The head and cylinder look ok but there has got to be an imperfection somewhere.

Fingerz crossed a head skim and gen yam gasket will cure the problem!!!

Thanks for that mate its reassured me a little!! Ive just been having a look at the head and i think it is warped, its very hard to tell with the naked eye but when you put it on something dead flat i think i can see a slight warp.

Im hoping to get my bike back up and running by the weekend. Ive got everything crossed that this will sort it! Im pretty sure it will tho there isnt anything else it can be really!