Problems with my Poorly maintained 2002 DT only 6500 miles

[Leftyno1]

[Calum]

That head will want a gentle skim. I wrote a tutorial about how to get that done.

Get the barrel down to a specialist to get them to see whats what. Can't see from tbe photo but it might not be too bad.

I would make sure the oil pump works correctly, increase the oil slightly or bettee still go premiz.

[Calum]

Could be wrong but almost looks like death ash on the piston crown. Another sign of overheating.

[Leftyno1]

Thanks for advice bringing all the bits back to UK at Xmas ,to a good Mechanic in my area for re bore etc.
The pre-mix idea is a very good one as I read on a blog about a guy who had 3 engine seizures before realizing it was the oil pump on his DT, In my humble opinion I think the previous owner ran the bike with no airfilter loose exhaust manifold which would in itself cause overheating plus PV not working and in shut position,
So on the bright side I think the CDI is OK as spark plug sparks

[Calum]

Okay,

Firstly CDI is not the only thing you can determine from the plug colour. I was thinking more fuel ratio since cdi does not control fueling. And cdi tends to be stock ignition curve.

Yes air filter will cause premature wear of the piston. But this would be evident in the reed cage and piston walls.

If it were me I would restore all the missing bits. Boost bottles snorkels and up jet it to 240 main jet.

I would replace the exhaust stud. I can't see why this would cause it to overheat though. I appreciate the scavenger process will suffer because of the harmonic resonance charge lost because of this stud. But then power would be lost too so it would only run a little hotter.

But whatever.

Keep us posted

[Leftyno1]

Will do Calum ,all good advice so will put everything back on and jet up, will report on progress after rebuild. Thanks.

[Calum]

Sounds like someone read on Facebook that they were all restrictions so removed them. Forums are the best for this sort of information and you have come to the right place.

The gain/loss might not be noticeable. Certainly the sound will bw different. But trust me when I say it's for the best that it be restored.

[Leftyno1]

Oh just as i am curious what does that bottle do before the Carb inlet ? , and is it worth taking baffle plate out of Exhaust ( mine is in the middle section of exhaust have to cut open and weld up), cheers

[Calum]

They are boost bottles. I can't remember the physics. But something to do with resonance.

[Calum]

I took the baffles out my exhaust before. Not worth the effort if you ask me. Just go ahead and buy a system.

[scrimsmustang]

Cause there is nothing to be gained removing the snorkel, wat a load of bs. Put the right pilot jet in and set the mixture screw up right and there is loads of bottom to mid to be gained.