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Forum: Zongshen RX3

04-27-2016, 11:28 PM

Replies: 19

Mystery oil leak

Views: 6,374

Posted By bobrx3

Speaking as a Brit, the engineers of the 50s, 60s...

Speaking as a Brit, the engineers of the 50s, 60s and 70s never really seemed to grasp the idea that fluids should stay inside the engine! They had vertically split crankcases and carbs that never...

Forum: Zongshen RX3

04-22-2016, 04:56 PM

Replies: 19

Mystery oil leak

Views: 6,374

Posted By bobrx3

Yup, that was it. The slow drip went onto a part...

Yup, that was it. The slow drip went onto a part of the frame that slopes down to the front. The trip ran down that bar, crossed over to the vertical cross section front frame member, then...

Forum: Zongshen RX3

04-21-2016, 12:55 AM

Replies: 19

Mystery oil leak

Views: 6,374

Posted By bobrx3

Well, I've reconsidered my initial assumption...

Well, I've reconsidered my initial assumption that the slippery oil like fluid that was dropping was engine oil. I now think it was probably coolant! The coolant in there is pretty concentrated and...

Forum: Zongshen RX3

04-20-2016, 01:08 AM

Replies: 19

Mystery oil leak

Views: 6,374

Posted By bobrx3

Mystery oil leak

When I come back from a ride and park the bike in the garage, the next day (or two) I find a few drops of oil on the ground under the bike.

"Simple" you might say, just look at what's above the...

Forum: Zongshen RX3

03-21-2016, 05:00 PM

Replies: 3

Seats - anyone have a used OEM for sale?

Views: 1,443

Posted By bobrx3

Seats - anyone have a used OEM for sale?

I've been messing around with various forms of padding and covers for the stock OEM seat and I think I have something reasonably comfortable new. My basic problem was that I kept sliding forward all...

Forum: Zongshen RX3

03-16-2016, 07:17 PM

Replies: 10

Spoke wrench size (and torque?)

Views: 5,819

Posted By bobrx3

This one -...

This one - http://www.bikemaster.com/tools/spoke-wrench.html - has 6.50, 6.00, 5.60, 5.40, 5.00, and 4.30mm sizes. Seems like a good deal at $7.95

Rummaging through my toolbox, I found that a...

Forum: Zongshen RX3

03-14-2016, 12:30 PM

Replies: 10

Spoke wrench size (and torque?)

Views: 5,819

Posted By bobrx3

Thanks. That wrench has 5.4, 5.6 and 6.0 slots. I...

Thanks. That wrench has 5.4, 5.6 and 6.0 slots. I know it can't be 5.4 and from my measurements 6.0 seems oversized, so it looks like the spoke nipples must indeed be 5.6mm.

The front wheel spokes...

Forum: Zongshen RX3

03-14-2016, 12:50 AM

Replies: 10

Spoke wrench size (and torque?)

Views: 5,819

Posted By bobrx3

Spoke wrench size (and torque?)

Anyone know the spoke wrench size for the stock RX3? I measure the adjusters to be about 5.6mm across, but 5.5, 5.6, 5.7 and 5.8 wrenches are available and I don't know if a 5.6 would be too tight....

Forum: Zongshen RX3

08-09-2015, 02:55 PM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

The carb issues sound different. Looks like the...

The carb issues sound different. Looks like the carb setup was running rich in a particular rpm range, which is something cured by changing the needle profile and/or the needle height. On an FI bike...

Forum: Zongshen RX3

08-06-2015, 03:08 PM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

Many thanks for the test and the log. Your log...

Many thanks for the test and the log. Your log and mine don't differ all that much - except for one thing. I notice that your "Fuel Pulse Width1" goes DOWN from about 3.1ms to 2.7ms when you open...

Forum: Zongshen RX3

08-05-2015, 05:35 PM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

Here's a 50 second snapshot of rpm data with a...

Here's a 50 second snapshot of rpm data with a constant throttle opening (TPS sensor output is essentially a flat line with a few 1 or 2 bit glitches)
...

Forum: Zongshen RX3

08-05-2015, 05:04 PM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

Here's what I see. It's obviously on a different...

Here's what I see. It's obviously on a different scale of course and it's at around 3000 rpm. The span is around 20 seconds and the vertical axis runs from around 30mV to 840mV. It's not hugely...

Forum: Zongshen RX3

08-05-2015, 12:30 AM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

Just FYI I hacked a VAG-COM USB cable. Cost me...

Just FYI I hacked a VAG-COM USB cable. Cost me $6. Of course you don't get the nice connector but the price was right and it arrived in a couple of days. Works just fine as far as I can tell.
...

Forum: Zongshen RX3

08-05-2015, 12:25 AM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

I do have the computer diagnostics working now....

I do have the computer diagnostics working now. As far as I can see the only advance parameter displayed is the calculated advance, so I can see what the advance should be under any set of conditions...

Forum: Zongshen RX3

07-30-2015, 04:02 PM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

Well, checked the exhaust headers again -...

Well, checked the exhaust headers again - everything tight. Checked the intake boots and vacuum hoses - no leaks. Oiled the air filter. Installed an iridium plug (indexed). Checked and cleaned...

Forum: Zongshen RX3

07-28-2015, 02:19 PM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

Thanks for the data point on the scooter. I guess...

Thanks for the data point on the scooter. I guess it could be a characteristic of small displacement fuel injected engines with one (or two) cylinders. It's not something I've ever noticed on the...

Forum: Zongshen RX3

07-27-2015, 05:10 PM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

Thanks Katflap. It's useful info that your bike...

Thanks Katflap. It's useful info that your bike doesn't seem to do what mine is doing.

I've read your excellent write up on diagnostics. You did a lot of work on that!

Getting the cable via...

Forum: Zongshen RX3

07-26-2015, 06:54 PM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

I know exactly the connector to the pump that you...

I know exactly the connector to the pump that you mean. There's a bolt that gets in the way of the locking tab. I noticed it taking the connector apart, so I made a special note to check it when I...

Forum: Zongshen RX3

07-26-2015, 05:24 PM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

Thanks for the comments. The slight surging I...

Thanks for the comments. The slight surging I feel under similar conditions - " riding at about 30 MPH @4000 RPM under a neutral load" doesn't really register on my tach either. The surging seems no...

Forum: Zongshen RX3

07-26-2015, 03:27 PM

Replies: 37

Unstable rpms

Views: 9,491

Posted By bobrx3

Unstable rpms

If I warm warm up the RX3 and then try to hold a steady rpm (say 4000rpm or 5000rpm) with the bike in neutral, I don't seem to be able to do it. With a constant throttle opening (no motion of the...

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