New Zongshen RX3 (ZS250GY-3) Dual Sport

[katflap]

Originally Posted by Veteran

It may be a long shot, but there aren't many other ways I can imagine the engine filling with gasoline; either the injector is intermittently sticking/leaking after shut down, or sticking and seeping after shutdown once it's warmed up, (same thing really). I've had carbs with sticking floats overfill and fill the crankcase but I've never seen an injected model do it. The injector is the only gas link to the engine so.....I'd change that first as you planned. Having gas in the oil isn't just bad for the bearings, it doesn't help the clutch either.

Yeah, I will definitely change the injector out when I've got a new one.
Like you say, it could be an intermittent fault.

I Will be keeping a close eye on the oil level and change it out often.
As you have pointed out, I don't want to shag the bearings or the clutch.
I guess it could also begin to degrade the seals too.

[Weldangrind]

Originally Posted by katflap

Ok so temptation got the better of me - out it came

Switched on, pump up to pressure - no leakage

cranked on starter - injector sprayed

stopped cranking engine - no leakage

so that's me stumped for now

I agree with Veteran that perhaps there is an intermittent leak at the injector when the bike is off. Is there an opportunity to pull the injector after a ride and leave it out? Perhaps you could suspend it over a container, to see if any fuel escapes overnight.

I would certainly change the injector, but I always prefer to have solid evidence to back up my theories. That said, I also agree with Veteran that the injector is the only fuel link.

[katflap]

Originally Posted by Weldangrind

I agree with Veteran that perhaps there is an intermittent leak at the injector when the bike is off. Is there an opportunity to pull the injector after a ride and leave it out? Perhaps you could suspend it over a container, to see if any fuel escapes overnight.

That's a good idea, I will try that when I get the opportunity

[Weldangrind]

Is there an opportunity for warranty replacement of the injector?

[katflap]

Originally Posted by Weldangrind

Is there an opportunity for warranty replacement of the injector?

Yes your probably right, I should chase it up and I may well do.

But I would like to get the injector out and test it to see if it drips under pump pressure.

I would like to have a spare one handy just in case it all goes pair shaped and wind up killing it.

[SpudRider]

Originally Posted by Weldangrind

Is there an opportunity for warranty replacement of the injector?

Originally Posted by katflap

Yes your probably right, I should chase it up and I may well do.

But I would like to get the injector out and test it to see if it drips under pump pressure.

I would like to have a spare one handy just in case it all goes pair shaped and wind up killing it.

I think you are wise to have Honley inspect the problem. However, it is also very nice to have a spare fuel injector for diagnostic purposes. I ordered a spare fuel injector from Taobao. They are quite reasonably priced.

[Weldangrind]

Originally Posted by katflap

Yes your probably right, I should chase it up and I may well do.

But I would like to get the injector out and test it to see if it drips under pump pressure.

I would like to have a spare one handy just in case it all goes pair shaped and wind up killing it.

Excellent plan. There are some spares that you should just have.

[SpudRider]

My Taobao shipment has cleared customs. Now it is only a short trip by U.S.P.S. Priority Mail to East Idaho.

[G19Tony]

Originally Posted by SpudRider

My Taobao shipment has cleared customs. Now it is only a short trip by U.S.P.S. Priority Mail to East Idaho.

[Huck369]

Originally Posted by SpudRider

My Taobao shipment has cleared customs. Now it is only a short trip by U.S.P.S. Priority Mail to East Idaho.

Looking forward to your review of the LED Headlight

[SpudRider]

Incidentally, I have measured the rear sprocket. It is a JTR473 sprocket, which fits the following Kawasaki motorcycles which have been sold in the United States.

78-79 Kawasaki KZ200
80-81 Kawasaki KZ250

http://www.jtsprockets.com/catalogue/sprocket/JTR473



This sprocket is available in 37T and 40T sizes from J.T. Sprockets. The Chinese WLJF sprocket which comes stock with the RX3 is only available in size 44T. Ryan at CSC told me they plan to order a batch of custom steel sprockets in various sizes directly from a sprocket manufacturer.

After I adjust the spring preload on my shock absorber, I will examine the front sprocket.

[SpudRider]

Rest assured, gentlemen and ladies, you at China Riders will be the first to hear my review of the upgraded, two LED headlight for the RX3.

[SpudRider]

I just completed another test ride after adjusting the shock spring preload on my bike. I have now recorded 1,135 miles on the odometer of my Zongshen RX3. Once again, the shock absorber performed significantly better with a larger spring preload. However, the shock response is still a little too soft for me. Therefore, I plan to tighten the spring preload yet another 3 turns. However, I am getting very close to the ideal setting.

[SpudRider]

Looking at Peter Verdone's chart, you can quickly determine the 10W, 15W, oil weight designations from the sellers can't be trusted, since one vendor's 5W oil might have the same viscosity as another vendor's 10W oil.

http://www.peterverdone.com/wiki/ind...spension_Fluid

Also, one shouldn't completely trust the chart, either, since the viscosity of a particular brand of oil might change. The only sure way to determine viscosity is to read the product data sheet (PDS) or the manufacturer's safety data sheet (MSDS) for each individual oil. For example, the Verdone chart lists the viscosity of Mobil1 Synthetic ATF as 34.0 with a viscosity index (VI) of 199.00. However, the PDF for this ATF at the Mobil website lists the viscosity as 36.3, with a VI of 176.

http://www.mobil.com/USA-English/Lub...hetic_ATF.aspx

For the forks in my other motorcycles I have installed Valvoline MaxLife Dex/Merc ATF. I chose this fork oil for several reasons. First of all, it has the lowest viscosity of any ATF I have researched.

http://www.valvoline.com/pdf/maxlife_atf.pdf

As an added bonus, this ATF had the lowest price. I bought the Valvoline ATF for $13.50/gallon at my local AutoZone store. Contrast this price with the cost of the "boutique fork oils."

Last year I changed the fork oil in three motorcycles in one month, using the Valvoline MaxLife Dex/Merc ATF, and I still have over a quart of ATF left over. However, I did use Showa SS-7 Fork Oil for the inner cartridge of my CRF250X forks, since the valving is designed for an oil with a viscosity of 16 cSt.

Most of the Dexron VI ATFs also have a low viscosity around 30 cSt, which is very close to the Valvoline MaxLife Dex/Merc. However, none of them could match the price of the Valvoline.

I chose Mobil1 Synthetic ATF for the forks in the RX3 because it has a higher viscosity than the Valvoline MaxLife Dex/Merc ATF. I wanted a higher viscosity of 10W for the RX3 forks, instead of the 7.5W provided by the MaxLife Dex/Merc ATF.

[SpudRider]

I have posted a tutorial thread which describes how to adjust the spring preload of the shock absorber for the Zongshen RX3. The thread is located at the following link.

http://www.chinariders.net/showthrea...d=1#post184432

I have added a link to this thread under the Maintenance subheading in the Zongshen RX3 Sticky Thread, which is permanently pinned to the top of this forum.

http://www.chinariders.net/showthread.php?t=14228