Difference tzr125 and dt125
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@irongamer727 I'd recommend Tuning For Speed By Phil Irving PDF available online
http://tuningforspeed.com/files/Tuning_for_Speed.pdf
As a start
Then have a read of Graham Bell's Two Stroke Performance Tuning
Then Graham Bells Engine Performance TuningYou always want to read in Chronological order. Phil's book was written several decades ago, Grahams during the late 80's.
Irvin was way ahead of the curve and received the highest engineering award they have in Australia. Named after him called the Irving award. The guy is a genius.
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@calum I have Graham 2 stroke at home. First time I read it I didn't understand much. Perhaps time to do it again.
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@irongamer727 I refer you to my previous statement.
Start in chronological order. Ready Phil Irvins book first. As this will introduce to the concepts at the time, which are assumed or taken for granted in later books.
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@declan The barrels are cast with only so much metal in them. It's not a case of inside liner. The walls are only so thick and can only be ported so much.
You could spend thousands and thousands porting the barrel, and the result is ultimately worse than a £60 RS barrel. It's cost vs Reward.
If I was going to spend X amount of money for maximum bang for buck, do an engine swap. It'll be cheaper and better.
So I'd rather swap the DTR engine out for a 2RK engine out of the UK spec TZR. Or better still Rotax 122 engine, or a YZ engine or anything else.
By all means, mildly port and tune the DTR engine, but accept that there are limitations. Ensure that what you spend, is less than what it would have to have simply swapped the engine.
That accounts for time as well as money. An engine may cost less than a decent port, but if it takes a year to fit then it's cost you time.
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The DT is still pleanty fast for what it is, a road going bike developed for teens on L plates, it's a damn site quicker than any of the 4t 125 bikes around, and they get incredible reliability when right. I plan on doing a lot of miles with long runs this year, so simply a road going mx would not work.
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@oldman I mean you're right, however, when push came to shove, I couldn't afford a bigger bike so it was easier to just chip away at tuning the DT.
You 100%, but sometimes a bigger bike isn't always an option. Having done my test several years ago, I have never owned another bike. The Aprilia that I am building is the only bike I've bought since doing my bike license, and I could have had that on L plates lol.
I think it's come to a point now where I could go out and buy an R1 or something, but then I know it wouldn't satisfy me.
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Like many people my age have done the big bike thing up to several zx9r's and an rf 900. They were unbelievably fast but the current crop of litre bikes makes them look like mopeds in comparison. They were beyond my ability in all honesty and the temptation to use the power was always there. I was lucky never to come a cropper on one of them and the 650 I have now is more than adequate and would be my first choice for a continental tour (I wish). For a few hours out in the countryside down a few lanes content on the 125s and not as demanding mentally either as a big bike. The temptations not there to wind on the throttle or chase someone that passes. Happy to add a bit of "pep" to the 125s but no more than that, but it's a personal decision and each person's passion is different. Just find it hard to justify spending hundreds of pounds chasing a few bhp when alternative bikes are about to give that extra kick. Does not mean I will never try it though, change is good! Bike I regret selling the most is a zx9r b4 in green with a stage 1 tune (if I remember correctly), absolutely brutal and mint condition, upgraded to newer model but not the same terror when riding
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@oldman Yeah, but you can say the same about anything in life. You wanna see the amount people spend on Starlets, when you could say go buy an Evo, or a GTR. Then they tune an Evo/GTR and you say go buy an Audi RS6 and it goes on and on.
The lads over at Skellerns are mental. Tuning their Air Cooled RD's to like 50+ bhp. There is something about the powercurve of a tuned bike. Or the sense of accomplishment when you hit that goal. It's something to while away the hours thinking over, rather than realising it's all pointless and everything means nothing. I think there is something to be said about chasing a power curve. If you can stand back and say you've built something special, that out classes the competition, that's an achievement in its own right.
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@Irongamer727 hi I tuk my old dtr125-lc2k and just found out iv got a tzr bottom end in it iv had it over 12 years now there is 1 thing thow it keep up with the 420 ktm and smoks any 250 I'd put a picture up but not to show how yet lol iv got the ktm frunt shocks wheel back shock back wheel the best thing it's all sat on a 1988 fram and never been on the road it's been in my family for a while now and been past over to me wen I was kid lol love it to bits tell you 1 thing its cost 300p just for the bearings all ov them and 120 conrod kit 150 for barrel piston kit that's how I found out it's a tzr I told shop it's a dtr125 last week lol an got a call to day and got told to fetch my engine in so I tuk it as you do and yes it's a 2001 dtr engine but full of a tzr shop was gob smakt lol it was all in a LC2K engine I let my friend hav a go wen I got it and he fell off it and bust the middle case so I did the engine swop everything went init the dtr parts I got rid of people say it's not possible my bike shoe sed it were at 1 point if the no wot to do my grate uncel was a bike racer that's were it came from so I'm not show wot it is apart from ktm bits cross dtrx engine case
