Quote:
Originally Posted by DannoXYZ
This is awesome work! 
1-2. Yay! Shows strong charged battery
3. Voltage measurements shows differential between probes. So leave blk/gnd probe connected to battery -neg terminal.
4. Awesome! This also confirms #3. Poor wiring to coils showing less voltage than at battery will result in weak orange sparks
6. Maybe I should use "bypass" instead of "isolate". You want entire fuel-system re-assembled. We'll bypass its function of fuel-delivery by manually sending petrol directly into engine.
This removes tank, petcock, hose, and carbs from equation. IF engine starts, then we know for sure with 100% certainly that fuel-delivery is problem. Something wrong with tank, petcock, hose or carbs. Then we can ignore everything else and do specific tests to determine which one of those is bottleneck. |
Thanks for all of your help and for clarifying all my questions! It means a lot
I bypassed the third test since the fourth test showed that it was effective, but I did get results for 5 and 6.
Results:
5. 10 cc of fuel after cranking for 10 seconds. Doing this test twice yielded the same results. There was a fuel filter on, so I began counting as soon as the fuel started flowing out of the hose; the flow was steady and strong for all 10 seconds.
6. Bike didn't start from this test. I tried a few times by putting 2-3 cc of fuel into the airbox (once with the filter on and once with it removed), letting it vaporize for a few seconds, then cranking for about 10 seconds, but it didn't start up. I also tried using a gloved hand and "smearing" it onto the airbox screen (connected to the carb) and tried again, but this also didn't work. While doing the test, the fuel tank, carbs, and petcock were all on the bike, but the fuel and vacuum hose connecting the tank/petcock to the carbs were both disconnected.
So, taking all of this info in, since tests #1-4 showed that the electrical/spark is good, and assuming that #5 is adequate fuel flow/vacuum from the petcock/carbs, does this mean that #6 shows that the low compression is most likely due to an engine issue?
Thanks again!