New Zongshen RX3 (ZS250GY-3) Dual Sport

[BlackBike]

Originally Posted by rjmorel

Good thinking with the silicone idea. As far as low pressure that's a concern but not for the riding I would do . Don't trials bikes run tubeless down to 4psi or is that a totally different setup? rj

I wasn't implying such a low pressure, but it may have to be pretty hi pressures to maintain that bead on a normal tire/rim that is designed for a tube.

I would definitely want tubless due to the simplicity and "plug-ability". Just not too excited about the higher costs involved.

[rjmorel]

Originally Posted by BlackBike

I wasn't implying such a low pressure, but it may have to be pretty hi pressures to maintain that bead on a normal tire/rim that is designed for a tube.

I would definitely want tubless due to the simplicity and "plug-ability". Just not too excited about the higher costs involved.

Agreed , to be able to plug a hole on the bike out on the road would be way more convenient then having to remove tire and rim from bike then get tube out ,fix and remount. It's not like I'm doing 120 mph all day on my RX3 so I think safety wise if it holds air it would be great. Even if I had to add some air to it every week or so, rj

[ben2go]

Originally Posted by rjmorel

Agreed , to be able to plug a hole on the bike out on the road would be way more convenient then having to remove tire and rim from bike then get tube out ,fix and remount. It's not like I'm doing 120 mph all day on my RX3 so I think safety wise if it holds air it would be great. Even if I had to add some air to it every week or so, rj

If you're good,you can spoon off one side of the tire while it's on the bike,patch the tube,and re-seat the tire.It can be a serious pain in the *** until you get your technique down.

[BlackBike]

Originally Posted by ben2go

If you're good,you can spoon off one side of the tire while it's on the bike,patch the tube,and re-seat the tire.It can be a serious pain in the *** until you get your technique down.

I did that one time on the front tire and patched remember was tough with the valve stem.

[rjmorel]

Originally Posted by ben2go

If you're good,you can spoon off one side of the tire while it's on the bike,patch the tube,and re-seat the tire.It can be a serious pain in the *** until you get your technique down.

I'll need to dig out my "on any Sunday" DVD and get my Malcom on I guess. rj

[rjmorel]

So I got to thinking today about my 70's racing motocrossers that had 2 stroke motors. Which motor would last longer if you had an air cooled 4 stroke and an air cooled 2 stroke or both water cooled for that matter and rode them basically the same, like commuting same distances and same speeds. Would they roughly last the same amount of miles? Or would 4 stroke last longer with pressurized oil lubing it. Or would 2 stroke last longer always having clean oil lubing it either from a oil injector or premix in the tank.
Anyone have any hard data on this? Say between 250 single cylinder motors with same cooling and same carb or fuel injection?
rj

[2LZ]

Originally Posted by rjmorel

So I got to thinking today about my 70's racing motocrossers that had 2 stroke motors. Which motor would last longer if you had an air cooled 4 stroke and an air cooled 2 stroke or both water cooled for that matter and rode them basically the same, like commuting same distances and same speeds. Would they roughly last the same amount of miles? Or would 4 stroke last longer with pressurized oil lubing it. Or would 2 stroke last longer always having clean oil lubing it either from a oil injector or premix in the tank.
Anyone have any hard data on this? Say between 250 single cylinder motors with same cooling and same carb or fuel injection?
rj

No hard data but from experience I can tell you that the 4 stroke will last much longer between rebuilds. I used to have to do bore/piston/rings every other racing season with all my MX 2 strokes. On my street-ridden 2 strokes, I'd just let them slap, even though they were losing performance. Plus, with a 2 stroke you're counting on the crank seals to help maintain compression and they're a seriously wearable part. Not only that but the rings passing over ports will start to wear them quickly as the piston begins to slap. Not an issue with a 4 stroke.

The upside of a 2 stroke, as you know is that they're much lighter, less moving parts and much more power-per-displacement. I do miss all that power! As you remember, all you needed to so was clean up the ports and add an expansion chamber and it would make them monsters. :-)

[BlackBike]

Originally Posted by 2LZ

No hard data but from experience I can tell you that the 4 stroke will last much longer between rebuilds. I used to have to do bore/piston/rings every other racing season with all my MX 2 strokes. On my street-ridden 2 strokes, I'd just let them slap, even though they were losing performance. Plus, with a 2 stroke you're counting on the crank seals to help maintain compression and they're a seriously wearable part. Not only that but the rings passing over ports will start to wear them quickly as the piston begins to slap. Not an issue with a 4 stroke.

The upside of a 2 stroke, as you know is that they're much lighter, less moving parts and much more power-per-displacement. I do miss all that power! As you remember, all you needed to so was clean up the ports and add an expansion chamber and it would make them monsters. :-)

3 words...E.P.A. but i guess better to breath for humans

[Dualsport Chic]

So, now that Rex is all broken in, I thought it might be nice it he got out and saw a little more of New England. Hopped on him bright and early last weekend. Pointed him North and didn't stop until I got to mid-Vermont (Castleton) to visit friends from my riding group. He made the 350 mile round trip day ride just fine as well as did his rider. Extremely smooth at 7500 rpms+ and I must say it was a pleasant ride. My friends up north were anxious to get a look at him. My friend Jack even hardwired my Garmin mount so I could have my Garmin charging while riding. He was impressed with the fit and finish and overall value to the bike. While I had a bit of a challenge keeping up with my friends on their litre bikes, Rex did ok considering he's a quarter of their displacement. So, another box checked for the RX3 - capable machine for a long day in the saddle on tar. Probably start getting him in the dirt next Spring to see how he does there but thumps up so far.

[BlackBike]

Originally Posted by Dualsport Chic

So, now that Rex is all broken in, I thought it might be nice it he got out and saw a little more of New England. Hopped on him bright and early last weekend. Pointed him North and didn't stop until I got to mid-Vermont (Castleton) to visit friends from my riding group. He made the 350 mile round trip day ride just fine as well as did his rider. Extremely smooth at 7500 rpms+ and I must say it was a pleasant ride. My friends up north were anxious to get a look at him. My friend Jack even hardwired my Garmin mount so I could have my Garmin charging while riding. He was impressed with the fit and finish and overall value to the bike. While I had a bit of a challenge keeping up with my friends on their litre bikes, Rex did ok considering he's a quarter of their displacement. So, another box checked for the RX3 - capable machine for a long day in the saddle on tar. Probably start getting him in the dirt next Spring to see how he does there but thumps up so far.

Good copy, any pics?

[Dualsport Chic]

No pics but i did get some video of the riders ahead of me - have yet to edit. . .

[Matty2193]

hey gang.

looking to buy one in the uk to tour around scotland and then europe and possibly africa.

What I am wondering is, it will come with the 15inch rear tyre. I cant find any good dual adventure tyres for the 15 inch?

anyone had any luck

Thanks.

(hoping to buy in the new year)

[Jay In Milpitas]

Originally Posted by Matty2193

hey gang.

looking to buy one in the uk to tour around scotland and then europe and possibly africa.

What I am wondering is, it will come with the 15inch rear tyre. I cant find any good dual adventure tyres for the 15 inch?

anyone had any luck

Thanks.

(hoping to buy in the new year)

Matty, I don't know what the shipping would be to you, but have you considered buying an assembled wheel (http://www.cscmotorcycles.com/Rear-w...-p/z51-103.htm ) or just rim and spokes from CSC?

[SpudRider]

Originally Posted by Matty2193

hey gang.

looking to buy one in the uk to tour around scotland and then europe and possibly africa.

What I am wondering is, it will come with the 15inch rear tyre. I cant find any good dual adventure tyres for the 15 inch?

anyone had any luck

Thanks.

(hoping to buy in the new year)

Welcome, we are glad you joined us.

I recommend you purchase the 17-inch spokes from either CSC or Minsk. Then you can purchase a size 2.50-17 rim locally, and either lace the wheel yourself, or have someone else lace it for you. You will have a very difficult time finding any good, fifteen-inch, dual sport tires.

[katflap]

As far as I am aware, all RX3 bikes in the UK have the 15 inch rear wheel.

I have found one place, in the UK, where you can buy a 15inch dual sport tyre and have one on my bike.

Kingstone 130/90 15 , I think spud had the same tyre fitted on his Zongshen ZS200GY-2 at one time
https://www.chinesemotorcyclepartson...rtno_OT1309015

I'm still trying to source a nice 18inch front though