DT125R FORUM

@OllieDTR Not sure of the thickness but along with the cylinder base nuts and studs, these are fasteners worth buying genuine from Fowlers.

@OllieDTR No? Jetting is normally easy as pi.

But apparently, as I found out on a recent dyno session, my entire setup is jank 🤣 Not terribly convinced. They sent me home on a completely broken/dangerous bike...

It's a good question, 70 sounds about right for the coolant temperature, not sure about temperature at the spark plug.

@SpookDog

The 3MB code exhausts up to 1996 I think it was are just hollow with a restrictor in the neck of the exhaust which dremel the 3 tac welds out and it pulls out, as for the gutting part, that’s on like 2003+ bikes as inside they have like this mess packing, take that out and they go really well and nice and loud I love loud bikes😂

All my mates got road legal mx bikes and 40bhp 125s they do 60 hours on a piston and I’ve still got 9k miles left to do😂 but got to admit they love to wheelie as got all that power and light as a feather

@OllieDTR

I actually don’t think you need to ‘shave’ the rubber inlet at all. The 30 or 32 (can’t remember which) dellorto fitted to tzr’s just has a thinner wall where it fits into the rubber…
Can’t speak for Mikuni though…

You will have to do without it being angled to fit like the 28mm though. Shouldn’t be a problem though. I’ve had 30mm carbs fitted to Vespa’s that were mounted at horrific angles and still worked fine 🙂 We never used to bother with any air filter either, just a bell mouth on the Lambretta’s, maybe…

I've had a few barrels done my Mick on my bikes. Both the 3MB000P and a 170 barrel and the difference in porting has always been night and day. The difference in performance is something else. I have never been great at actually "feeling" the difference.

Bikes with the dyno at the moment so I can post up how it gets on.

The base performance of the DTR is weak IMO. Compared to Aprilia/Cagiva barrels it is a very slow/detuned motor. Porting it may help, but you're very limited in what you can achieve with the standard setup.

In my experience, the DTR never favoured aggressive porting as it's best ridden in the mid range, due to its setup of being a trail bike. My fondest memories of the bike was probably when it was mildly tuned before I had it ported.

I was, at the time, 70kgs wet and that obviously accounted for most of the performance.

Now, coming in at more around the 90kgs, having the 170 kit makes the world of difference, but the bike has lost a lot of overrev. Now I pootle around at 4k and probably maxes it out at 10k.

It's setup lovely how it is at the moment and I cannot wait to get it back from the dyno.

@SpookDog

Yes thank you, I thought the colours should match just when I got it they didn’t but still ran just making sure it’s all right

Hi guys had mot today
Put a brand new plug in and ripped it to mot and back got 72.1mph on gps so pretty good! But wasn’t fully pinned, got home and thought I’d Chuck the plug after a 4 mile ride
What you think?
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