New purchase 1990 dt125r

[oldman]

Here's one I prepared earlier !
0_1502570553952_20170715_131805.jpg

[ukchad]

Is it normal for the exhaust to heat up so much then, when the power valve is fully open?

Also died a bit when I kicked up into 6th, ran out of power (maybe wasn't high enough revs)

[ukchad]

@oldman soooo clean

[declan]

@ukchad coming from 4 stroke this was crazy for me I have full functioning pv) my muffler gets too hot to touch

[declan]

@terry-tz hey thank you buddy nice hearing that much appreciated but a lot to go yet

[terry.tz]

@declan good to know there's more to come

[Calum]

Hello and welcome'

Get the servo retro fitted and have a working powervalve. Best of both worlds.

Exhaust gets hotter because you spend longer times at higher rpms. Refer back to my previous statement. Get the servo fitted. Less stress on the engine.

I would start simple first, check the thermostat, they are probe to failing after zo many years.

Head gasket is not the same as a four stroke. No valves no nothing to go wrong.

Buy only genuine or athena gasket, skim the head like described in my tutorial, then boom, good to go.

Nice bike.

[Minia]

Welcome, looking good

[declan]

@calum what's skimming the head do I know squish and compression etc but does just that on its own yield noticeable results?

[NINJA]

@ukchad Welcome aboard, looks like you have a decent starting point there.

[ukchad]

@calum so I think I understand.

At the moment the power valve either works at low down or higher revs because it is fixed in position?
I choose that position by turning 180 degrees either way?
By fitting a servo, the power valve is rotated to give me full power depending on revs.
Is this correct?

My power valve doesn't look like most i see in pictures - no cables or slots for cables in the casing. Just a central bolt, flanked by 2 small outer bolts

Can a servo still be retro fitted to this?

[Nottsbiker]

Yes you are missing the cables, servo, cable housing, cover and pulley.

You can get these from any DTR or TDR and they will fit your bike. Not sure on servo motor but i think any DT one can be adapted to fit

[ukchad]

Thanks @Nottsbiker

If any one knows, finds or has one that fits please bear me in mind.

I can then start a build thread and you can all watch me mess it up!

[Nottsbiker]

Think you and i will be after m the same vintage servo motors

Don't out bid me on any lol

[ukchad]

Let me know, and we can make sure!

[andrewj1680]

The powervalve is different you would have to change the whole lot in my opinion its not worth it the servo takes the fun out of it anyway

[declan]

@andrewj1680

Any idea what that yellow and black wire does that goes to the powervalve servo it turns using the key still?

[andrewj1680]

At a guess mate that 1 sends signal from the cdi unit, have you tried riding the bike to see if it still cuts in?

[declan]

@andrewj1680 on it right now and no decent seem to be and it always lands on the open position crazy how much different the bike sounds when it's open

[declan]

@andrewj1680 love it it's actually use able at low speed now but my idle has gone up to 2.5 when I'm gear in neutral it drops back down to a slow 1.5 any reason for this?