DT125R ARCHIVE

I'd check for a Yeis bottle, this can be a side effect of missing one. Especilly if you are having weak compresstion, failing that, for instance if its always been like that I'd be thinking maybe someone hasn't set up the carb needles right.

I've not renewed it, ive just cleaned it all out, snorkel is off, but made it proper **** putting it back on. off subject thing also..

was going along dual carriageway for a while, went over a roundabout, accelerated. and back wheel totally locked up on me, pulled over, bike was REALLY hot, i got a br9eix plug in, reckon it's making piston way too hot? it to why its locking back wheel up, maybe heat seizure? br9es i should of had in there really, i just wanted the better start up in mornings with the other plug

i checked top of piston from port, it's not melted at all, i should use the proper br9es plug u think and not the br9eix?


anyways, that was last night the lock up, started first thing this morning, rode 25 miles back from my girlfriends, and it seems fine now?! seems so weird, i've only got a 250 main jet with my full dep system (240 made no difference), i put redex in yesterday, maybe i shouldnt of done, going back to standard front pipe,. with standard 210 jetting in to be on safe side.

nope i let it warm up first of all before i start riding long distance, just put normal br9es plug in which says from manual, started first time this morning, with no problems, i went 45/50mph on dual carriageway and it was pretty decent, i checked over piston it's okay. starts first time still, oils getting there, and also is water, the culprit is i would say the redex then,before hand it was perfectly fine! just thought i'd put a little redex in to see if it cleared system a bit, but for future reference i wont be using it again on 2 stroke!

 

Also: I found that running from br8es to a br9es was a big difference, it didnt misfire as much when de-revving. could of been bad fueling at the time though, who knows!

-- Edited by The_DtR_Maniac1991 on Friday 19th of September 2014 12:55:04 PM

Cheers buddy, it seems okay now, no more weird lockups, also a loose chain can cause lock ups cant it? it was loose (cant spell) but not really bad, could of been the reasons

 

Is it possible to check which plug your running ? I may use the same, you seem to have no problems lol

-- Edited by The_DtR_Maniac1991 on Tuesday 23rd of September 2014 04:01:18 PM

The_DtR_Maniac1991 wrote:

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I've not renewed it, ive just cleaned it all out, snorkel is off, but made it proper **** putting it back on. off subject thing also..

was going along dual carriageway for a while, went over a roundabout, accelerated. and back wheel totally locked up on me, pulled over, bike was REALLY hot, i got a br9eix plug in, reckon it's making piston way too hot? it to why its locking back wheel up, maybe heat seizure? br9es i should of had in there really, i just wanted the better start up in mornings with the other plug

i checked top of piston from port, it's not melted at all, i should use the proper br9es plug u think and not the br9eix?


anyways, that was last night the lock up, started first thing this morning, rode 25 miles back from my girlfriends, and it seems fine now?! seems so weird, i've only got a 250 main jet with my full dep system (240 made no difference), i put redex in yesterday, maybe i shouldnt of done, going back to standard front pipe,. with standard 210 jetting in to be on safe side.

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If it's only happening at certain rpm then I'd suggest its probably not air filter related but its still something thats so cheap its hardly worth cleaning. replacing will ensure its not part of the problem.

Your incident sounds very much like a heat seizure. If you've checked the bore and piston and all looks ok then you got luck but you need to find out why it happened. The red ex could be the culprit but dont assume it is. Check the jetting and give the carb a good clean. Also I'd check for any air leaks.

 

The spark plug heat rating is the rating that the spark plug operates best at. It wont make your engine run hotter or cooler but will give you a better bang if you have the right plug in. The reccomened plug is stated for everyday general riding. You may well find one that 1 either way that suits your riding style more.

 

Fouled plug mate. Probably that redex stuff has destroyed the plug.

Probably doesn't need a hone mate if it's just had one and there is no damage to the bore. Very simple engines so it'll be something simple. If the engine rotates freely and there is good compression then it's probably bad fuel, damaged fuel filter, incorrect jetting settings.

What piston did you use? I know that Wossner pistons for whatever reason require upjetting. I had to take my DT to like 280 on wossner pistons. In order to get golden brown plug.

Have a look at the plug. Get a photo up here and I'll tell you what the crack is.

If there is redex in the system and you put a new plug in then the chances are it has fouled the plug. I'm just going on what you've said.

It was working fine, you gave it a nice rebuild (assumes that is done correctly), run the bike, put redex in, problems occur. So Redex seems to be causing the problem. Question is, is there any left in the tank....

I suppose it's possible that it's dirtied up the carb and what not. So would be worth getting that all cleaned.

So I know that you cannot clean iridium plugs. So maybe the redex is 'cleaning' the plug. Which is stripping it and that's why it's not working.

Industrial piston? Okay....Are you sure that's okay. You naturally want a piston that will expand at the same rate as the bore....So by that logical it needs to have the right carbon content. I'm not sure just banging in any old piston is a good idea. It wants the right silicone content and various other properties that allow it to expand sufficiently.

Go for a non iridium one until you can be sure there is no redex in the system. Then go back to a new iridium plug.

Can I get 2 stroke additive stuff? Ive used it before in my DT. It would help it flush the redex out. I've got a BR9EIX iridium plug. would that be okay? Or shall I go for the BR8EIX?

Shall I use super unleaded? Maybe it'll help just a little. I've had bad fuel a couple of times. and the bikes conked out, For now I'll just clean this NGK R BR9ES. then once I fill up with fuel again, I'll continue to use the BR9EIX plug. But i will use super unleaded instead. The sake of 5p more paying for super unleaded could make it run little better.

I've got a TZR engine, aftermarket CDI, Dellorto VHSA carb and a ported engine, can't say I can give you much advice on jetting.

What worked for me way back when, 240-280 main jet, with needle clip raised.

The lower the needle clip, the richer the mixture. Because if you lower the clip, you raise the taper. Which richens the mixture. That's how I remember it.

It shouldn't need it. There has got to be some sort of problem. The bike should run fine with the snorkel in. Is the YPVS setup correctly? You have the correct boost bottles and what not?

New nicely lubed air filter for sure, whack that 240 main in and never bother running super unleaded on a DT, it's not a race tuned engine by any stretch of the imagination, so there's no real point (imo).

If you're still having trouble just start again from standard like you said, that's always the best way to set things up right again.

*EDIT* I just bothered to read through a bit more, sounds like needle position....revert back to standard position (middle). You shouldn't really have to adjust the jetting with a DEP, Myself and 4+ of my friends have never had to. I only had to adjust the main jet when running my custom pipe as it was fuel starving in 6th gear, pinned.

 

-- Edited by Energized on Friday 26th of September 2014 01:59:04 PM

-- Edited by Energized on Friday 26th of September 2014 02:04:22 PM

Yes mate it will defo help and it's a service item so two birds with one stone (won't need touching again for ages). Aye fair enough mate, the best thing to do is revert the carb settings back to standard and use the standard plug size aswell. See how she runs then and it should be job's a good'un! If not then it's a different main jet/needle position depending on the diagnosis that you give us once you've rode her on standard settings! Do a few plug checks along the way aswell just to make sure and you can't go wrong.