Join Date: Feb 2019
Thanked 4 Times in 4 Posts
OK. I got the two Autoline injectors from Rockauto, aaand one is marked "C" and the other is marked "D". They were in the same boxes and had the same reman part #, but the C and D are two distinct part #'s from Honda and used on two different engines (the "D" went on the version of the engine with VTEC, the C was on the version without).
Anyway, for poops and grins I dropped them in the bike and gave it a shot. It ran, but poorly again. Still seemed too rich with a poor off idle and response, but not as bad as with two "D" injectors. I wouldn't totally dismiss the idea that getting two actual "C' injectors may still work, but I'm getting tired of ordering and returning stuff. I put in an offer for a complete used throttle body off a 2005 M50 off a crash victim part-out.
The stock injectors have been ultrasonic cleaned several times, blown out with pressurized carb cleaner, and appear to spray just fine, but it still refuses to run correctly. It mostly runs OK, but the first 10% of the throttle doesn't really do anything, the idle is weak, power seems down across the board, and tons of popping on decel. All still lean symptoms.
Decided to do a fuel pressure check. The pump in the tank died shortly after getting it and was replaced with a good quality aftermarket. I jerry-rigged up a fuel pressure tester with a my compression tester gauge, a couple air compressor fittings and a bit of hose. Plugged it to the air tank and it was bang on matched with the compressor's gauge. Stuck the hose on the tank outlet, plugged in the power and cycled the key. The pump ran, but only registered ~20psi or so, which dropped to zero almost instantly once the pump shut off, it should hold pressure for at least a few minutes.
Pull the tank and the pump assembly, one screw and the regulator comes out. Air blows straight through it, all coming out around the spring/diaphragm end, and not out the return line that funnels the excess gas back into the fuel pump's little cup. So the regulator is dickered. Well, half the pressure it should have will definitely cause issues. Surprise, Suzuki doesn't sell the regulator on it's own either. Only as part of the complete $500 pump assembly. And of course, companies that sell replacement regulators for GSXR's, v-stroms, ect, don't have one for the c50. They look very similar, aside from not having the right angle in them, but the nipple looks identical. Could probably make it work, would just have to make a new bracket to retain it.
Just one thing after another with this bike. EFI is nice when it works, but when it doesn't, what a nightmare. I'd rather have just a carb.
Last edited by RWhitehosue; 03-19-2019 at 04:34 PM.