Piston movement
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Hi guys
With my bike before I got it, it had a rebore and new piston 1.00 oversize, I’ve done the run in and I’m only getting 105psi so I thought I’d take the head off to look at the inside, cross hatching is lovely but piston has knock when you have it at TDC and rub it with your fingers you can feel it has play and see it also, what would cause that? The barrel is in perfect condition aswell as the piston, do you think I need another rebore or get some new rings for the piston and should sort it? -
I’ve had same issues when I bought a barrel with an amateur rebore. It was noisy and horrible. I get my rebores done by PJME, they are always snug as a bug in the barrel…
I’d be inclined to send your barrel & piston off to a reputable company to get it checked out properly by someone with the proper tools who knows what they’re doing… -
I don’t know about porting, I’ve never had any interest, so I never looked into it. If I was going to do anything it’d be an abused 2nd hand Athena 170 that I’d get sleeved with a cast liner…
Turn around depends on how busy they are. Sorry, not what you want to hear!
I’ve waited 3 weeks at the height of covid, then well under 2 recently…Callum would be the person for advice about porting. Mike Abbot, or Mike someone
As long as they’re reputable then you only have to pay once… -
I’ve messaged Mickey abbey tuning and see what price he gives me! I did remember speaking to him on the phone awhile ago as he was going to machine my 3bn head so it’s like the 3mb head so will get it all done at once, I’ve heard proper porting on a 125 is the nuts
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Rang Mickey abbey, he said porting is pretty good on the dts anyways so probably won’t do to much that is crazy noticeable, did ring PJME, same turn around time 2 to 3 weeks I’ve seen and read good things about Mickey abbey tuning and been going years so will be sending to him and he’s only £35 for rebore! Win win
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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.
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