DT125R ARCHIVE

Reef · Guru

RE: CARB PROBLEM, BIGGER PROBLEMS :/ HELPPP

Seiki · Admin

lolz I did that

Reef · Guru

Just had another quick look as i needed to grab a tool where my bike is kept and I just noticed a slit in one of the water tubes which go from the head to the carb, located close to the clip which holds the tube onto the tube, guess it could of got caught when putting the tubing back on, question is could that have caused that hissing noise coming from the carb area??

FunkeyMunkeyDavid · Guru

if it was split all the way through and the engine was hot,the water would pressurise and hiss or squeak as it escaped cry would explain how it only started after the jet was changed confuse

Reef · Guru

Ok thanks, ill have to check it out again when i next work on it, but ay its always started with the original and new 240 jet, just ran lean tho with both, bujt yeah with the new jet it was hard to fire up, which i guess that may be because of the small pilot jet it had in it still or this possible air leak, soon to find out tho, when i strip it down ;)

Thanks again funky

Reef · Guru

Hello lads , got the day off today so have been stripping the bike down, noticed that one of the screws which hold the carb top down didn't have a washer (or is it an o ring gasket??) could this be a reason into why the carb area was hissing when running, after fitting the carb back on??

Also here's some pictures of the progress so far, if you see anything wrong give me a shout, much appreciated, Jordan

Reef · Guru

Little slit on a breather tube closest to the carb, could it cause it to hiss??

Just throwing things out there to ensure everything's ok

Reef · Guru

Now this seems a bit weird, check it out, after removing the carb I noticed this tube was not connected to anything nor sealed, what's it for, could this be why it was hissing lads, and also what should I do with it?? Leave it how it is, connect it to something, or seal it, pics below, appreciate if someone could back to me ASAP as only day off this week cheers

Reef · Guru

Fail!!! Haha sorry mate, yeah it is lol, Cheers mate

NEV · Guru

Deffo the main fuel pipe is that, if you undo the pipe clip and pull that tube off, you'll find the gauze filter inside the spigot , might as well give that a good clean while your carbs off.

Reef · Guru

Hi lads sorry battery died, yeah the inlet had always been like that from when I first bought it last year, it's not a crack tho even though it looks like it in the pictures, it doesn't go all the way through, jus a little bulge been taken out of it on the exterior side somehow, so this wouldn't be the reason into why its hissing as it didn't do it before we took the carb off to change the main je

The hissing just sounded like it was sucking in air from the carb area after changing the jet

I've noticed that the majority of the screws which hold both top and bottom covers of the carb don't all have washers (or are they I ring gaskets???), could this be the problem of why it was hissing as air could be getting sucked in through the screw holes??

Also in regards to cleaning the carb, how should I clean it? I have carb spray and toothbrushes but how should I clean it, how much cleaner do I apply and should I stay away from certain areas??

Also I noticed this on one of the screws, what is it for and I swear there should be two and not one??

Here's some pics, once again if you spot anything funny please let me know, cheers, ill wait for you to get back to me before carrying on cheers

NEV · Guru

The picture with the weird shaped ring attached to a screw looks like its a pipe clip thats been opened out, may have been used as a guide for one of the overflow pipes mind.

Reef · Guru

No mate I appreciate any help, so thank you :) probably best that I wait tho so that someone can confirm what you suggested is the right way to go about it :)

Ay I had a slight feeling it was for that (to hold a tube), can't see them being that important tho, also I may have just found the answer into why it was hissing but carry on with your suggestions if you think it could be anything else lads please... As I was waiting I decided to clean the coil (suspension coil that is) and the pipe which comes from the air box easily slipped off accidentally, I'm thinking maybe that was where it was sucking it in and causing the hissing noise but on the other hand the noise was coming more from the carb area, I will seal it properly tho this time

Reef · Guru

Little update, carbs back on and pilot jet changed but will have to finish it off when I get home from work, I'll let you know how it goes, oh yeah the bottle which sits in the inlet, should the arrow on it be facing the cylinder head?? If any needs a pic let me know and I'll upload one

Cheers

FunkeyMunkeyDavid · Guru

yeah arrow to the front . hope it runs well for you. defo sounds like you found the hissing problem biggrin

Reef · Guru

Hello lads,

So got the bike back together to start it today... So just to go over what I did

Advised by members on here I used a 240 jet and I remember being advised by funkyD to try out a 25 pilot jet after it wasn't idling

Also funky d that I should try the idle screw with it 1 1/4 out from all the way turned in

Ok so I did that but when I fired it up it was revving really high, so I adjusted the idle screw and then it was idling fine,

With the snorkel off (want it to run without snorkel) it didn't want to rev nicely, here's a vid, it was hard to get it over 6k, and it was warmed up for about 15mins, you can see it proper trying but it was struggling https://i1226.photobucket.com/albums/ee420/reefvodka/2012/Carb%20update/FA9CE782-F837-4EF5-A988-3C1F269D8E0A-422-000000C2FCACFA49.mp4

So then I thought I'd put the snorkel back on and rev it like that, it now revs fine and idles fine, a tad boggy maybe at low revs but its a lot better with the snorkel, so that tells me that there's too much air in the mixture, so what should I do, should I do a plug chop with the snorkel perhaps and go from there?? Or should I not run it now and change either the main or/and pilot jet again?? Please suggest another jet setup if this is the case? Or even change the needle position from middle to top/bottom notch?? I presume I need to do a plug chop but I just want to confirm, thanks

Oh yeah no more hissing coming from the carb area :D

-- Edited by reef on Saturday 13th of October 2012 01:24:03 PM

-- Edited by reef on Saturday 13th of October 2012 01:26:29 PM

Reef · Guru

Managed to get home nev ;) thanks mate

Just an update, I mentioned in my last post that it wouldn't rev properly without the snorkel and when I put it on it revved freely.... So I decided to take it for a quick run with the snorkel, as soon as I left basically it was doing the same as in the video I posted, but I thought it was still cold so I carried on... But no it wasn't that, it basically didn't want to go over 3/4k so when I was on a hill it was struggling to stay running, and that's when I called nev for his advice :) I cleaned the spark plug whilst it was lashing it down and rode home on less the whole way, grrr

Here's a picture of the spark plug, remember I gave it a quick clean with my hand around the brim of the spark plug to get rid of the black oil, and it wasn't a plug chop

So yeah what do I do?? Doesn't that show its still running lean lol??

As for the air/throttle screw I only knew about the screw which looks like a flower (I adjusted that) could you tell me please what that is and where abouts to find the other screw as I can't see it at all??

I'm baffled what to do now so any more suggestions would be great, thanks

Sorry on mobile

-- Edited by reef on Saturday 13th of October 2012 04:21:24 PM

FunkeyMunkeyDavid · Guru

solve one problem,find another biggrin always the way.... have you adjusted your air/fuel screw to suit? its the one on the side of the carb beside/below the idle screw? nice and easy to adjust. warm your bike up,then while its ticking over adjust it inwards till the revs drop,then out till the revs drop. your looking for the point where it revs highest.... then see what she revs like. glad there's no more hissing though biggrin

toadymc · DTR Respected Member

Yeah you need to adjust your air screw now mate sorry i didnt explain it properly. With the new pilot jet you should have the air screw about 1 an 1/4 out and your idle quite low espesialy for testing you have the right size jet the air screw is just to the right of the idle screw behind the yeis bottle . So get the bike warmed up a bit gently screw the air scew in till it seats then come out 1 an 1/4 an set your idle so its just ticking over then to test make sure bike is properly warmed up go round the block a few times then pull up let it idle an then real quick wack the throttle wide open if it boggs or hesitates adjust a little more until the throttle response is right

-- Edited by toadymc on Saturday 13th of October 2012 11:55:20 PM

Reef · Guru

Thanks mate, your a star, and just to confirm the idle screw is the one which looks like a flower right??

toadymc · DTR Respected Member

Yeah thats the idle screw it just moves the slide up an down and be carefull with the air screw make sure you get a screwdriver what fits perfect or it can slip easy its only brass

toadymc · DTR Respected Member

Oh yeah forgot to say glad the hissing has gone mate did you find out what it was? Did you put a washer on that throttle cable screw?

Reef · Guru

Cheers man, appreciate it

As for the hissing noise I'm not too sure how it went away but I'm guessing it may have been that loose air box pipe tube or the y.e.i.s bottle was loose

But no I forgot about adding any washers to the screws, seems alright like that but if I have to change the jets again because of a poor mixture ill be sure to add them using the dtx carb washers

Reef · Guru

Won't be able to start this up again till at least Tuesday/Wednesday but I will update once air screws are adjusted

Reef · Guru

Going to be adjusting the air screw tommorow and just want to make sure this is where the the air screw is, looks like it from the diagrams but toadymc said it was below the yeis bottle ?? Couldn't be from that as the bottle is found on the other side once hooked up)

Or is it here then??

Cheers

-- Edited by reef on Tuesday 16th of October 2012 08:57:07 PM

NEV · Guru

top pic Reef, bottom pic is drain screw.

FunkeyMunkeyDavid · Guru

squirt of WD40 on that screw overnight bud. see if you can prop the carb up so you can fill the screw holder with wd. will save some swearing tomorrow biggrin

Reef · Guru

Cheers mate

toadymc · DTR Respected Member

Yeah i mean the one bolted to the frame but its only in the way with the carb fitted to the bike

NEV · Guru

I took mine last week to the usual bike mechanic I take my finicky stuff to, and he got mine out charged me a fiver, just try another garage Reef, you'll get it sorted mate.Oh aye order yourself another screw too, I get mine from Damerells at Plymouth, about £14 each, comes with spring. tiny brass washer, and a tiny rubber o ring.

-- Edited by NEV on Wednesday 17th of October 2012 02:10:17 PM