650 Swapped CX500 On The Dyno! VOLUME UP! EP62

The 650cc swapped CX500 build on the dyno! Volume up as this thing sounds AMAZING and put down some great power! This is a long time build and it is finally ready to ride after sorting a couple issues. If you see a specific item on this bike and want to know more about it, I have a dedicated video on it within this playlist with full information in each description.

Previous video breakdown of the bike:
   • CX500 BUILD IS BACK! Project Re Intro...  

For those unfamiliar this is a 1981 Honda CX500 that I have built and has extensive changes throughout the entire bike. For this video the main change is the 650 engine I swapped in from a 1983 Honda GL650. I did a complete rebuild on the engine with stock pistons/bore and a fresh hone. It has new rings and just fresh throughout. I did do a bit of work on the cylinder heads with a light cleanup and port-matching on the intake side to match the fabricated intake manifolds. The exhaust side is merely cleaned up with no big changes there.

Other components/specifics below:
- Mikuni VM34 carbs - NO I WILL NOT PROVIDE MY JETTING INFORMATION
- UNI PK92 filters
- Handmade stainless 2 into 1 exhaust. 1.5" OD tubing with dual 1.5" inlet and 1 3/4" outlet merge. - 1 7/8" ID inlet Competition Werkes Muffler 3.5" canister version but custom ordered
- Rae-San Hall Effect Ignition system
- Ultima Big Twin single fire coil PN 53-434

On the dyno our main mission was to work on drivability and fueling at normal operating conditions. Simple jet changes and adjustments were needed. As the dyno is a great tool it was able to highlight other issues I had with the bike in the areas of fuel supply and ignition.

On the fuel supply issue it became pretty clear the petcock I had installed simply could not keep up with the fuel flow demands and was causing a lean condition mainly in the left cylinder. Once we hooked up a simple fuel bottle we could continue with testing. I have since purchased a Pingle 6411-AH petcock which is for the 16x1.5mm threads on this tank. That will sort my fuel flow issues.

For the ignition misfire this was due to two issues. I had set this bike up with some MSD automotive plug wires that I had lying around but was not using a resistor spark plug cap. The Rae-San system seems to not like those so I have since picked up a set of NGK copper core wires with the 5k ohm you normally see on the bikes. The first few scenes on the dyno you can hear a lot of misfiring which was due to the spark plugs. I had a non-resistor plug in the bike and forgot about it. I ran to the store and grabbed some NGK DPR8EA-9 plugs and that was a drastic improvement. All simple fixes but hard to diagnose on the street.

I can't thank Mike Taylor of Taylor Motorsports for his time and knowledge on this day! He really allowed me to test and see changes in hard data form. He is a total pro so check him out via links here:
Facebook:   / taylormotorsportsstl  
Instagram:   / taylormotorsports2644  
Located at 2644 Gravois AVE in St. Louis

Playlist guide:
Carbs and Intake manifold fabrication: EP20
Making the shift linkage: EP24
Full engine teardown: EP35
Cleaning/hone: EP36
Porting/valves: EP37
Engine assembly: EP38-40
Rae-San Install: EP48


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