At wits end

[Jay In Milpitas]

Originally Posted by fishman10

Csc sent me every sensor , and a Ecm Throttle body , oxygen sensor , coil. And plug wire , ,, so I installed everything an took the bike for 100 mile ride . Sad to say it still stalls to be honest it stalled 16 times that day. So I did a compression check ( with a brand new harbor freight tool). And bike has 40 lbs less than. Csc specs. So not sure what's wrong , Now. For the good news csc is going to pick my bike up an fix it or put new engine in. "Whatever it takes". According to Steve an Jerry , So this had got to be the best customer service ever ! And it's winter here so don't ride as much anyhow!

Last night I read through the Top End tutorials (You really rock, SpudRider) and I learned for the first time that these have decompressors in the cam system, including a washer that must be oriented correctly.

Since CSC is now stepping in, it's a moot point but I wonder if the stalling problem might lay within? Hmmm. Will be interesting to see if we get a post-mortem from them.

[fishman10]

Yes , when I saw spuds top end tutorial and saw the decompression device I also wondered if that could be my issue. I too hope they tell me what was wrong with it!

[Adjuster]

Originally Posted by fishman10

Csc sent me every sensor , and a Ecm Throttle body , oxygen sensor , coil. And plug wire , ,, so I installed everything an took the bike for 100 mile ride . Sad to say it still stalls to be honest it stalled 16 times that day. So I did a compression check ( with a brand new harbor freight tool). And bike has 40 lbs less than. Csc specs. So not sure what's wrong , Now. For the good news csc is going to pick my bike up an fix it or put new engine in. "Whatever it takes". According to Steve an Jerry , So this had got to be the best customer service ever ! And it's winter here so don't ride as much anyhow!

Wow sorry to hear all this is happening to your new bike. Sounds like CSC is going to get you squared away but man what a bummer to have to go through this.


/

[rtking]

Originally Posted by fishman10

For the good news csc is going to pick my bike up an fix it or put new engine in. "Whatever it takes". According to Steve an Jerry , So this had got to be the best customer service ever ! And it's winter here so don't ride as much anyhow!

Ditto what Spud, LeeR and everyone else stated... good news that you're getting squared away. I can think of no other distributor (motorcycle, automotive, or other) that would step up and take care of a customer this way. Kudos to CSC for the exemplary customer service!

[SpudRider]

Originally Posted by fishman10

Yes , when I saw spuds top end tutorial and saw the decompression device I also wondered if that could be my issue. I too hope they tell me what was wrong with it!

The decompression device in the RX3 camshaft is very similar in design to the decompression device in my Honda CRF250X. When adjusting the valves, it's important to turn the crankshaft far enough to click past the knob which partially opens the exhaust valves. Otherwise, you will not get the valve lash set to the proper gap.



The decompression device has a long arm where it exits from the camshaft (see photo above). Once the engine starts running, centrifugal force on the arm causes the decompression device to rotate, moving the knob out of the slot on the camshaft. However, at speeds lower than 400 rpm, the spring holds the knob in a slot at the bottom of the exhaust cam. This protruding knob presses the exhaust valve rocker, and partially opens the exhaust valves.

[fishman10]

well i adjusted the valves exactly like it shows in the csc tutorial,,could they be off ,,i guess its possible ,But it had the stalling issue from day one,before i did the adjustment.Not sure if that coud cause 40lbs. less compression... Will have to wait an see what csc says.

[RedHawk47]

I had a similar stalling problem with my F800GS although it usually required 80+*F air temp and 40 miles of engine warmup to manifest. It took four months and several new parts for the BMW dealer to finally find a fix. Final cure - new fuel pump. Several others on AdvRider had similar stalling - they fixed right away with an aftermarket pump - the OEM pump is $500!! Aftermarket <$100.
Dan

[SpudRider]

Originally Posted by RedHawk47

I had a similar stalling problem with my F800GS although it usually required 80+*F air temp and 40 miles of engine warmup to manifest. It took four months and several new parts for the BMW dealer to finally find a fix. Final cure - new fuel pump. Several others on AdvRider had similar stalling - they fixed right away with an aftermarket pump - the OEM pump is $500!! Aftermarket <$100.
Dan

Is the aftermarket pump an inline fuel pump? If you have time, will you share a link to that fuel pump?

[fishman10]

Now after seeing that the rx3 has a automatic decompression device , I wonder how one could get an accurate compression reading . My compression might not be low after all.

[SpudRider]

Originally Posted by fishman10

Now after seeing that the rx3 has a automatic decompression device , I wonder how one could get an accurate compression reading . My compression might not be low after all.

The automatic decompression device definitely lowers the pressure when conduction a compression test. However, I still think your compression is low. My Honda CRF250X Service Manual indicates you should get a reading of 57 psi when doing a compression test. The engine size, cylinder compression, and automatic decompression devices are very similar between these two motorcycles. Therefore, I think 40 psi is a very low pressure for your RX3.

Of course, it is probably better to do a leak down test on these bikes.

[SpudRider]

Here is an interesting video which shows how the automatic demcompression device works on my Honda CRF250X, and our Zongshen RX3 motorcycles.

[fishman10]

Spud , I must have said it wrong, according to jerry at csc the rx3 compression should be 160 an I only got120. So 40 less. Not sure how much the compression device lowers it

[SpudRider]

Originally Posted by fishman10

Spud , I must have said it wrong, according to jerry at csc the rx3 compression should be 160 an I only got120. So 40 less. Not sure how much the compression device lowers it

Well, that certainly makes a big difference.

Perhaps the automatic decompression device in the RX3 isn't as aggressive as the same device in my Honda CRF250X. My Honda XR650L also has an automatic decompression device. The Honda service manual for that bike says compression should be 92 psi with decompression device enabled, and 199 psi with the decompression device disabled.

[RedHawk47]

Originally Posted by SpudRider

Is the aftermarket pump an inline fuel pump? If you have time, will you share a link to that fuel pump?

Is an inline fuel pump one that the fuel comes in one in and goes out the other end? The BMW type pump has both fittings on one end.

I looked at the parts drawing on the CSC website and could not see what type it was. Poor quality photo.

I did a search in Amazon for "BMW F800 fuel pump" and came up with many choices, many of them "inline" as described above. Reading some descriptions it sounds like they are for carbs and need a pressure relief valve.

This is one that fits my F800GS:
http://www.amazon.com/gp/product/B00...=sr_1_9&sr=8-9

[SpudRider]

Originally Posted by RedHawk47

Is an inline fuel pump one that the fuel comes in one in and goes out the other end? The BMW type pump has both fittings on one end.

I looked at the parts drawing on the CSC website and could not see what type it was. Poor quality photo...

Yes, you described an inline fuel pump, which is located outside the fuel tank. The fuel pump of the Zongshen RX3 resides inside the fuel tank.

Originally Posted by RedHawk47

...I did a search in Amazon for "BMW F800 fuel pump" and came up with many choices, many of them "inline" as described above. Reading some descriptions it sounds like they are for carbs and need a pressure relief valve.

This is one that fits my F800GS:
http://www.amazon.com/gp/product/B00...=sr_1_9&sr=8-9

Thank you.