What's missing here?

Pablo13 · 10 Feb 2018, 18:30

So, check the green black wire is grounded and stick a finger in my exhaust is the next port of call?

Cheers for the help btw guys

NINJA · wrote on 28 Sept 2018, 20:57

@Pablo13 LOLLZZZZZ Yep that's the top notch technical diagnosing we all love on this forum dude - very simple but highly effective!!!

Let us know how you get on??? :grinning_face_with_smiling_eyes:

Calum · wrote on 28 Sept 2018, 20:58

@Pablo13 That's for RE's the green and black wire.

Just align the valve flush in the exhaust port and disconnect the servo.

That will eliminate it being the valve.

Pablo13 · wrote on 28 Sept 2018, 21:00

Cool. Its a bit dark out there now, but I'll let you al know how I got on soon

Pablo13 · 30 Sept 2018, 16:52

Its not the valve. I took the exhaust off and aligned the valve, unplugged the servo and it was still the same at the top. What should I look at next?

Calum · wrote on 30 Sept 2018, 16:52

@Pablo13 Cool, you're getting the same issue then?

Have you done a plug chop? What's the fueling saying? You running snorkel in or out? How old is the spark plug. Is it the correct plug?

How old is the ignition system?

Is the air filter clogged up?

Pablo13 · 10 Feb 2018, 18:31

Yeah still going flat in the higher rpms. Maybe the coil is weak. No plug chops yet, but I stuck a new one in a few weeks back ngk 8 i believe. Also along with a new air filter as it just ticked over 24km.....about 15k miles. Snorkel is in. Problem has been there before the service too. Would be nice to get to the bottom of it

Calum · wrote on 30 Sept 2018, 17:08

@Pablo13 Cool, fueling bone stock. Bike isn't modified?

It might be just a tired engine. Low compression and piston blowby.

Pablo13 · 30 Sept 2018, 18:16

Just an aftermarket exhaust and a 240 main jet I stuck in, that's it. So compression test next?

Calum · wrote on 30 Sept 2018, 18:16

@Pablo13 What exhaust you running?

Most manufactures stipulate sticking with 210 main jet, despite the uprated exhaust.

I don't know the figures that constitute acceptable levels for the compression test.

I would look at the electrics first.

If the engine sounds sweet, then chances are it is.

Pablo13 · 30 Sept 2018, 19:32

Rino Racing or something similar the exhaust is.

So check over the coil next?

Calum · wrote on 30 Sept 2018, 19:32

@Pablo13 Yeah something isn't right. But 93, if it's the original electrics, then I'd swap out the coil, and HT lead for a new one.

If it's still causing issues then it can only be the CDI, pickup or engine.

Unless someone else wants to chime in, I can't see what else it could be.

The fueling shouldnt be far off.

Bluestoesonnose · wrote on 1 Oct 2018, 04:58

If it's running lean or seems to be at high revs, there are five simple things to try.

Float level, is it getting enough fuel?

Tank cap, is the vent blocked or partially blocked cause fuel starvation?

Fuel tap, is it opening fully and is it and it's filter clean?

There is an inline filter in the brass pipe in the top of the carb, is it blocked?

Air filter, is it very dirty or over oiled as too much fuel is as bad as too little?

Pablo13 · 10 Feb 2018, 18:25

All good ideas there thanks

Float level was set when I changed the needle stop as it was pissing out fuel from the carb when I got the bike, but sadly the problem was present before.

Tank cap Is a good shout, Ill take a look at that and the filters once the fuel level gets lower.

Air filter is new and not particularly over oiled, but again its been doing it with this one and the previous filter so can rule them out.

Ordered a new coil, HT and cap anyway. Possible the one on the bike is 25 years old, so cant hurt

Pablo13 · 2 Oct 2018, 18:02

Should also add that the bike revs freely to the red line when in neutral with no load.

Calum · 2 Oct 2018, 18:49

@Pablo13 That rules out somethings, but the real test is under load. That's where the problems will become apparent.

stinkwheeler · C Calum 2 Oct 2018, 18:02

i would definitely whip the cylinder off and see whats going on for the sake of a new piston and small end and a gasket set ... probably would have been my first shout and check for wear around the ports if you have tried everything else but it does sound like a electrical or cdi issue ... 240 main is best for dtr if you are running a aftermarket exhaust but its a tad rich so i always run without a snorkle never had a problem in the rain ect ....

Pablo13 · 8 Oct 2018, 18:10

So I fitted a new coil. Its a little better but still not quite right. Gets to 9700 now before going flat, but still feels like a little step around 9 where it tails off. I checked the carb and I think someone has previously removed the filter as I cant see one in there. I've got an o-ring coming for the tap so will wait until it comes then check that out too. Then I guess its time for a compression test, but I'm not expecting anything out of the ordinary because it runs sweet everywhere else.

How much is one of these zeeltronic jobbies then?

NINJA · wrote on 8 Oct 2018, 18:10

@Pablo13 Which country do you live in dude???

You can but direct, dependent on whether or not they ship to that country;

http://www.zeeltronic.com/page/aprilia.php

Or off good ole ebay;

https://www.ebay.co.uk/itm/CENTRALINA-APRILIA-RS125-1996-2011-PROGRAMMABILE-CDI-IGNITION-ZEELTRONIC-MOT-122/271194690954

Pablo13 · 8 Oct 2018, 19:24

I'm in the UK.......just see the price, lets hope it's not that

DT125R FORUM

What's missing here?