DT125R FORUM

Well saved

Will a 1989 3MB head fit the 3MB barrel of my 2000 dt?

Was going through eBay looking at 2T oil and see that rock and putoline have a strawberry scented 2T oil. Am I the only one that finds this funny? never heard of it before. Anyone used it?

Mine did this too when I bought it. I drained the oil in it and used rock oil lite lightweight gear oil and it slowly stopped doing it.

Yea that happened a xt 125 of mine and it was the side stand.

Mine has a 3mb barrel with 3bn head it's a 2000 model. The 3mb head is the unrestricted one.

@aidan1996 cheers thanks for reply can't wait to hear her scream again..

How long should I run a freshly bored top end in for? I've about 50 miles of riding under 5000rpm and also put a little 2stroke in the tank aswell as having the pump going. Also I'm thinking of repacking my silencer and jus wondering if there is there much point?

@Burridge. Did you notice much of a difference?

What years of dt's come with the 3mb head? Are they the same size and fit as the 3bn jus without the squish band?

Just out of curiosity what is the top speed you's are getting out of these? Mine does about 75 with 2 on but it won't do 80 even with jus myself.

Yea tried the needle position when all was standard but the leaner I put it the worse it ran the richer the better but still didn't cure the hesitation.

Thanks for the help.

I got the bike going today by using a 30 pilot and the rest standard. She takes the throttle no problem but the plug is wet and oily. I might try lowering the needle to lean it a little to try and get the nice brown colour it used to be.

I will check the choke just to make sure and then I will be able to rule that out. I'm running br8es which hardly make much difference?

Its awful hard to get a constant sign from this yoke so I've a new coil ht lead and a cap coming, new air filter and I might get reeds too.

Put in the washed air filter with the 27.5 pilot and 240 main and at 1.5 screws out on pilot seemed to have the least amount of bog even a little screw either way didn't seem to cure it?

I put all the standard jets in (240 main and 25 pilot) but no good seemed to be the further screwed in the better.

When I bought the bike it didn't seem to do it but started now. There was a small cable tie wrapped around the choke so that it held it up just by a mill or two. I put one of them back on with the 25 pilot in and it take the boot no problem but then top end seems to suffer a little.

Starting to give up on this

@Darty

I blew the air filter out with compressed air but I'll wash it and leave it to try over night and try it again tomorrow .

Newish plug in it too.

Thanks for the help

@Calum

The air box doesn't seem to have been touched small black bottle on left is there but wasn't tightened right but made no difference. Snorkel there nothing seems to be missing. Bike will idle now but when you give it the boot she hesitates.

Am I right in fiddling with the pilot circuit to try and cure this problem?

Cheers for the help been at this a few days now and not getting anywhere...

New to this
Ive a 2000 yamaha dt 125r dep pipe ( has been welded ) and silencer, the reed switch took out of the back of the clocks ( didnt notice any difference by doing that ) and think it may have different reeds in it ( they are not metal, they are like a yellow plastic type maybe hy-tech).

Any way, she seems to bog down but then takes the throttle when you snap it open. you dont notice this too much when you are driving just when it is on the stand. idle is difficult and its in the low revs were she bogs or hesitates. plug is a nice brown in colour though?

Its a tm28ss carb with the standard jetting, 240 main and 25 pilot. ive tried adjusting the pilot screw but no luck. Bought a 250 main jet and a few bigger pilot jets but that not helping with the bog.

Anyone have any ideas?