Pre-96 were not restricted but not all were full powere with YPVS.

After that they become a nightmare to derestrict.

But if you are "tuning it to the max" what difference will the year make.

Ultimately they all run very similar engines.

The newer ones are by far the easiest to derestrict.

But again you will want to at some point get an aftermarket CDI.

These bikes can't be tuned to the standards of the Aprilia RS engines, they simply were never designed that way, but can be tuned to give a noticeable amount of power.

Welcome to the forum

I look forward to seeing what it is you end up buying/doing.

My guess is to stop crap being thrown all over the brake caliper

No notification of delivery yet, maybe tomorrow, would only use old one as emergency spare if I was satisfied it was serviceable. Lasted a fair few years so new one will last a while, will probably replace the 89 as well when I get that far, peace of mind and no disappointment

Spark Plug looks fine mate.

I didn't think it was fueling.

A plug chop must be done at high RPM WOT and the ignition to be switch off and clutch pulled in then bike pushed home

You don't get any sort of idea of how the engine is performing whilst pootling around. However you do see if there are any problems.

So if this were a four stroke engine I'd be like yeah, break her in.

But sorry, piston and rings is simply maintenance on two strokes.

I would bed the rings in to the new bore, or give the bottom end a good run in (which you haven't built so no need). I'd do the rings and piston in 10k miles.

Maybe but exclusivity costs money

Is it not in that pdf i sent out last week?

Iirc it's connected to the battery via a heavy duty red (positive) cable which then goes to the starter motor. I think that the black (earth) cable goes from the battery to the solenoid then from there attaches to the engine. There is also a two wire plug that goes to the solenoid which is the lower power switching signal which is connected to the starter button.

No pics I'm afraid I'm away on holiday at mo

I will try find my design and measurements my friend and send it over to you, however I can't promise anything because I have just moved house so it's a job of finding it at the moment . bare with me please

Good luck! I'm in Brittany at moment so bit far too take mine to drop it in

@calum said in Inspecting powervalve:

@nottsbiker Not true as it happens. The bush the oring sits on can actually wear out as well, elieve it or not.

Sorry had assumed it was locked open

@uber_beluga absolutely no work has been done unfortunately. The owner has no disposable income at the moment

Yes, they have built the engine. Ahh i get it, not so complicated after all.
Thanks

@vtrn_raptor See this thread and speak to @tdrgreg2

He used a set of Aprilia MX 125 USD's which were almost a direct bolt on, just one spacer required.

https://dt125r.co.uk/topic/1020/dtdr-build

Is their a washer under your main jet if not that might be the problem

For the sake of £20 on gaskets and 30mins work I would pull the top end off could be little or nothing but atleast you know. I'd cringe riding around sounding like that I'd be constantly waiting for it to go bang

Glad to hear

He gave me these dimensions :

Bottom of the stem is 30mm
Top bearing inside diameter is 28mm.
Top to bottom length is 250mm.

Anyone measure or have measurements for the DT?

Personal choice is what's going to be the decider here

I've had 3 DTR's 1 other TDR and 1 DT-WR and would always build a WR based bike over the road biased R every day.

Like I said though it's personal choice