New Zongshen RX3 (ZS250GY-3) Dual Sport

[SpudRider]

Originally Posted by rjmorel

Spuds, did you thread the end of the handle bar 1/2-13 or 1/2-20 to mount the hand guards? thanks, rj

I threaded the end of the handlebars with a 1/2-13 tap. The coarse threaded bolts are easier to find. Also, it is easier to install the 13 tpi bolt, since the bolt grabs the threads more easily. I used 1-inch long bolts, but I still have a lot of thread available inside the handlebars. Therefore, I am going to install either 1-1/2 inch, or 2-inch long bolts. This installation is very strong; I am pleased with the results.

[pete]

Originally Posted by jimjr21

Making a stroker crank is easy. Just go to a smaller crank pin diameter. However that is also a way to make it less reliable.
I will be looking for a reliable way to make a stroker crank. However it needs to be 3+mm or no go as power gain would be minimal for an expensive assembly.

How dose going to a smaller crank pin diameter increass the stroke ?
Stoke is the centre line of the crank pin & main journal X2
the Dia of either has no bearing on the stoke..
to increass the stroke you have to move the centre line of them
ferther apart...

[Miqueas]

Don't you think it has to less liquid?









What about the oil level?






I'm just regreting have bought this bike, the service center doesn't have a clue about this bike, I already take the bike to they, and they said it isn't anything wrong.

I have 330 km riden. My first oil change, and they made me use syntetic oil, now I'm reading I shouldn't use syntetic for the first oil change. My guess is they haven't remove and change the oil filter and oil strainers.

Is this gonna give me some trouble later, right? Any advice?

[pete]

Wouldn't be worryed about syntetic oil.....

Yamaha recomends Yamalube which is Motul 5100
syntetic 10/40 rebranded for them..








.

[fishman10]

i received my optionAl dash kit an was wondering. ,, while it looks pretty self explanatory , where does the relay go ?? Is it an addition or a just a heavier duty replacement for the existing one.And where is it located ? Thanks in advance

[jimjr21]

Originally Posted by pete

How dose going to a smaller crank pin diameter increass the stroke ?
Stoke is the centre line of the crank pin & main journal X2
the Dia of either has no bearing on the stoke..
to increass the stroke you have to move the centre line of them
ferther apart...

There are clearances from crankshaft and rod assembly to the surrounding case. These clearances have to be maintained.
So if you have a 24mm crank pin stock and switch to a 22mm pin. Keep the thickness of rod the same and the outside location of the pin the same the center line of the crank pin will move to a 2mm larger circle. Presto +2mm stroke.
Now clearances to head must be maintained. So you need a -1mm rod length center to center. But the real clearance issue happens at BDC where now the piston is 2mm further towards the crank and case. This is why sometimes you see spacer plates put into stroker kits to clearance piston to crank issues. But then you run into cam timing and cam chain length issues. Other ways around it are pistons with different pin heights to compensate with using a crank and rod setup that has pin in higher location than stock.

[Miqueas]

Originally Posted by pete

Wouldn't be worryed about syntetic oil.....

Yamaha recomends Yamalube which is Motul 5100
syntetic 10/40 rebranded for them..
.

I had used synthetic oil Motul 7100 10/40.
This is my first oil change at 340 KM.

Howvever I read on the CSC blog the first oil change should be not synthetic oil.

Another question. In your bikes the oil is visible from the circular hole in the motor? even with the up mark. Please check my oil level in my photos in my other post.

[SpudRider]

Originally Posted by Miqueas

I had used synthetic oil Motul 7100 10/40.
This is my first oil change at 340 KM.

Howvever I read on the CSC blog the first oil change should be not synthetic oil.

Another question. In your bikes the oil is visible from the circular hole in the motor? even with the up mark. Please check my oil level in my photos in my other post.

Please reduce the size of your photos. They are difficult to view, and they slow the loading of the web page. Thank you.

[SpudRider]

Originally Posted by fishman10

i received my optionAl dash kit an was wondering. ,, while it looks pretty self explanatory , where does the relay go ?? Is it an addition or a just a heavier duty replacement for the existing one.And where is it located ? Thanks in advance

What items are in the optional dash kit? Why does it include a relay?

[Huck369]

Originally Posted by SpudRider

What items are in the optional dash kit? Why does it include a relay?

The relay is for the USB port, to drop the voltage to 5 volts (I suspect it is a transformer, instead of a relay)

[SpudRider]

Originally Posted by Huck369

The relay is for the USB port, to drop the voltage to 5 volts (I suspect it is a transformer, instead of a relay)

Thanks, Huck.

[Huck369]

Originally Posted by SpudRider

Thanks, Huck.

This was just my assumption...I have nothing to back that up....but would need something to drop the voltage....and the Lighter plug works without the "relay" plugged in, so it has to be for the USB plug

[SpudRider]

Originally Posted by fishman10

i received my optionAl dash kit an was wondering. ,, while it looks pretty self explanatory , where does the relay go ?? Is it an addition or a just a heavier duty replacement for the existing one.And where is it located ? Thanks in advance

Is this the item?

http://item.taobao.com/item.htm?spm=...ucket=4#detail

[woodlandsprite]

Originally Posted by SpudRider

Today I successfully installed a pair of Tusk D-Flex Handguards on my Zongshen RX3.

Nicely done Spud - I see you did have to shrink your levers to fit inside the guards too.

I look forward to seeing your installation thread, though I fear this might be a bit much for me to tackle with no other experience under my belt at least I have something to aspire to

[SpudRider]

Yesterday I went for a ride to test my suspension settings and handguards. Here are a few photos from that ride.



















I believe I have optimized my suspension with the Mobil1 Synthetic ATF in the forks, and the shock rebound damping set at the #10 position. The handguards are strong, and well positioned. All controls worked well.