Tales from the Emporium

[NordieBoy]

I'm trying to get a clip link to replace the rivet link on my one

[warewolf]

Blingy blingy.

Looking good, Vern!

15 front JT 45 rear Chaingang

Suggest you do Nordie's mod to the front sprocket cover, that JT is the weak link.

I've done the same to my 640, despite the cover coming off every 5000km for oil & filter change. It's great being able to inspect it in a split-second... and hence plan its retirement. The front JT on the Triumph hasn't been seen for over 50,000km and the rear is ready for replacement - at which point the front is usually...

[NordieBoy]

15 front JT 45 rear Chaingang and EK MVXZ 525.

So the 15/45 will be about the same ratio as the 14/43 I'm running at the moment.
I like it for playing in the hills and compared to the 14/41 it means idling down the other side of the Maungatapu was a comfortable 2nd gear affair with no pushing you a bit fast into some corners.
I'm getting used to it on the open road too and am just playing around seing what kind of mileage it gets to a tank.
At the moment my thinking is I'll be using this gearing for the Dusty.

[cooneyr]

So the 15/45 will be about the same ratio as the 14/43 I'm running at the moment.
I like it for playing in the hills and compared to the 14/41 it means idling down the other side of the Maungatapu was a comfortable 2nd gear affair with no pushing you a bit fast into some corners.
I'm getting used to it on the open road too and am just playing around seing what kind of mileage it gets to a tank.
At the moment my thinking is I'll be using this gearing for the Dusty.

Scratch that - 43 rear. Ratio is 15/43. Been outa bed at 6 for that past 5 mornings (including weekends) cause wife working early shi(f)t at the moment. Thank god she is giving the job away.

The 14/43 is all good for blasting round off road but I find it a little buzy on the road. Have been 15/43 for most of the last year and 14/43 for the past 4 or so months. 15/43 is a better compromise I recon. If I didn't have to ride around the Canty plains I would probably stick with the 14/43.

Cheers R

[Transalper]

15/43 is my favourate, don't see myself changing it for anything. If I felt the need to change to 14/43 then I'd proberbly be going somewhere where I'd try be on the CRF instead anyway.

[NordieBoy]

Just put the 15t front on and the only place it feels better is in top at 100.
I'll run through this tank to get some mileage figures but I can see myself going back to 14/43 for normal use and only to the 15 for longer road trips.

[cooneyr]

Just put the 15t front on and the only place it feels better is in top at 100.
I'll run through this tank to get some mileage figures but I can see myself going back to 14/43 for normal use and only to the 15 for longer road trips.

Stop bloody skiting. We all know there are plenty of hills and nice twisty roads around NN

Cheers R

[NordieBoy]

Just been through to the Maungatapu summit (via some detours along the way) and the 15/43 is not the ratio for me.
Either bogging in first or having to carry too much speed for my likeing going up some bits and similar on the way down.

Yeah, I hate how Nelson is full of long boring straight bits

[NordieBoy]

Jeeze, this is the longest my poor little DR has gone without something being changed.

All I've done recently is the rear wheel bearings, swapping the front sprocket occasionally and a small unifilter to replace the carb diaphram breather filter (the foam was disintergrating on the original).

I started wearing my MX helmet again and of course it makes the bike sound different and I thought the cam chain may be going but it turned out to be a loose bolt on the header shield

I managed to put 18.75L in yesterday and at a guess there was half a litre still in there after 333km using the 14t front.
I put the 15t on after filling it up to see what mileage I get from it to compare.

[marks]

yah know this whole gearing thing is a real pisser.

On my wr I can have a 13t front and have a first gear to go anywhere but scream its nuts off at 100k or a 15t and slip the crap out of my clutch on steep hills etc but cruise fine at 100k. or I can put the 14t on and get a compromise that isnt good at either.

why do they never give mid sized trailies a decent spread of gears.... mumble mumble mumble.

I hate changing sprockets....

[NordieBoy]

Yep, on the DR a 14/43 combo with a 6th gear would be sweet.

[GaZBur]

I am still on stock gearing and was changing into top just over 140K (on the track - before someone gets all upset). Looking at the gps charts the acceleration took a big kink after the change so the jump between 4th and 5th is just too big. I assume there is nothing you can do about that is there, and still maintain a good top speed of over 160k.
On the road I find getting up to 100 in 4th then changing into 5th to maintain 100k cruise speed works but less than 100 and I got to drop a gear.
I have two questions.
1. Does anybody know what is the (actual/real) top speed of a DR with std gearing and also with the smaller 14 tooth sproket. My guess is that it won't pull maximum revs in top with a standard motor as at 160 it doesnt sound like its revving too hard at all.
2. Does anybody know if there is a real rev limiter on the bike or does it just stop revving when its had enough. Its really like hitting a wall when you get to 100k in second.

[NordieBoy]

On the dyno the revs stop quite abruptly as it starts dropping sparks at about 7800rpm.

Let's see...
If 14/41 = 4500rpm @ 100kph then @7800rpm it's doing 173kph.

Soooo...
15/41 @ 7800rpm should give a theoretical 186kph.
14/41 @ 7800rpm should give a theoretical 173kph.

[GaZBur]

Hmmmmm!!

Thanks Nordie that is very informative and not what I expected. I hope you don't mind me throwing these questions at you. From what you have shown I am now convinced to change my gearing.
173k is heaps for most situations and realistically will it pull more than that with standard gearing. I think probably not, so it is quite possible that the theoretically lower gearing will allow an actual higher top speed because the engine can realistically pull top gear properly.
The main straight at Teretonga is about 950metres long compared to about 740meters for Levels so getting top speed is possible geared correctly.
Also I find at the Kart track I am topping out in second before the end of the straight now so making one change up and one change down a lap wont hurt, everybody else uses about 2nd,3rd & 4th each lap - I just hold second gear all the way and use the torque, he heh!

[GaZBur]

On the dyno the revs stop quite abruptly as it starts dropping sparks at about 7800rpm.

Let's see...
If 14/41 = 4500rpm @ 100kph then @7800rpm it's doing 173kph.

Soooo...
15/41 @ 7800rpm should give a theoretical 186kph.
14/41 @ 7800rpm should give a theoretical 173kph.

Sprocket ordered and on its way. What I will do is try the standard sprocket first to see what it will pull. If it pulls less than an indicated 180kph (probably real 175kph from gps readings) on the speedo I will drop to the 14 tooth for the acceleration advantage if nothing else.