Dtr mileage

declan

What’s your highest mileage your clocks have shown on your bikes my dt say over 140k that seems like it’s really high to me

declan

@declan my trip counter also says I’ve done 200 miles on my new tyres I’ve road my field probably twice and my estate once how’s that possible

Calum

Well that simply isn't possible, since the maximum DTR clocks can read is 99,999.9 miles....

declan

@calum my clocks are kmh am I doing the conversion wrong

Calum

@declan Most likely. The highest I've seen clocks are around the 30k mark. And that's savage amount of miles on a DTR.

declan

@calum my clock says 225665kmh

Calum

@declan Yeah the last digit is a decimal value mate. That's the mileage of my Starlet, which is exceptionally high.

It's 22'566.5 km, which is around 14k miles. Which is about the time you'd want to do a top end rebuild on these bikes.

declan

@calum ohhh so I just got it wrong lol I already did the top end when I got it it’s still sweet

Calum

@declan Yeah I know, I was just saying, for future reference. That's a rule of thumb, not the rule itself. And depending on the state of tune for the bike it may need to be done more often. A bog standard DTR oiled with decent stuff should do around 12-15k miles. I'd do mine a hell of a lot sooner than that, just because it's cheaper to throw a new set of rings on there than it is to rebuild the engine.

declan

@calum so at say like 12k miles your still running perfect but have a spare set of rings can you throw them on and get another 12k out of your piston or does it not work quite that well

Calum

@declan Try maybe once a year lol.

But then my barrel has been ported, larger intake and exhausts port cause excessive wear to the rings. When you start tuning, throw reliability out the window.

That said, didn't ride my bike this year so it won't need doing. And don't plan on using it next year, so I won't do it next year either.

No, you definitely wouldn't want to be doing 24k on a factory piston. Buy forged components and they will last a lot longer, but it's all about tolerances.

We are specifically talking 2 strokes here, but the principles apply to any mechanical engineering. So long as components are within tolerance, they should last.

But anything can happen, including manufacturing defects. So it's completely up to the builders discretion whether a component can be reused.

declan

@calum so is my trip counter reading 40.6 too instead of 406

Calum

@declan I don't know, is it? The last digit on the end is a decimal point.

declan

@calum if the last digit is a decimal point then yes it is

PJT95

Bought my bike at 22k miles. Piston went at 26k and scored barrel. It was still on original bore too.. piston swapped and going strong again, currently at 29k miles.

Calum

@pjt95 Yeah...but it's not going to be making full power. And it won't last that long if the barrel is scored. And I don't know about you, but the last thing I want is the engine seizing whilst I'm doing 70mph...

declan

@calum straight line ain’t too bad but on a corner is a death wish

Calum

@declan Although he was coming off a corner, it seized on a straight.

https://youtu.be/g5_A5oi7wC0?t=34s

I just don't think it's worth the risk. If the bike isn't tip top, don't ride it.

declan

@calum personally I wouldn’t run a bike with a screwed up top end unless I don’t mind losing it

PJT95

It was scored, I wasn't aware it was original piston until it went. I got it rebored and skimmed by Fahron Engineering so I'd say its in good shape now. Now I know how many miles this piston/ring and bore have done, I'll definitely be replacing rings when the time comes.

Mine seized on the way home from work on coming off an island doing 35-40mph, it deffo scared me.