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By gordonmacritchie
on my honda trx 500 we have no power to the ignition switch for starting or ignition
we have lights and horn working
all fuses are fine
have traced through the harness and cant find any broken wires or bad connections
from what we have gathered so far the pgm fi unit is not sending any power to the fuel pump relay to power everything up.
if we put power direct to the ignition switch plug then everything works but wth the key in the off position.
does this sound like a faulty pgm fi unit?
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By Admin
View File 1986-1989 Honda TRX350 Fourtrax TRX350D Foreman service manual
1986-1989 Honda TRX350 Fourtrax TRX350D Foreman service manual
Submitter Admin Submitted 03/08/2026 Category Honda ATV
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By toe420
Hey everyone, I just picked up a 91 trx350 4x4 with a blown top end. I don't know what happened to the poor thing but the cam journals that were round are oval shaped now. I also bought a running engine from a 92 trx350 4x4 to swap into the 91. Is there anything in particular I should be checking while the engine is out and I have good access to it and the frame?
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By ButchM
Hisun 700 EFI. Replaced TMAP sensor had broken off . Fuel pump pressure 41psi. The only way I can keep it running (and runs fine) is to close off fuel return line.
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