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Louie, Technician
Category: Motorcycle
Satisfied Customers: 12677
Experience:  25+ yrs. experience
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When my 83 honda shadow gets hot the front cylinder starts

Customer Question

When my 83 honda shadow gets hot the front cylinder starts misfiring, I lose power and it finally quits. Let it cool for 15 minutes and it runs fine until it gets how again. by getting hot it seems to be at a normal operating temperature but how weather shuts it down.
JA: Have you checked the coolant? Have you noticed any leaking?
Customer: Yes its fine and the cooling fan will come on.
JA: What year is your Shadow?
Customer: 1983 vt750
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Switched spark units same problem on front cylinder and pick up coils test at 245 ohms. also changed coils.
JA: Anything else you think the mechanic should know?
Customer: I thought you were the mechanic!
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Motorcycle Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Motorcycle
Expert:  Louie replied 1 year ago.

Hi and welcome to JustAnswer,

Thank you for the question and your patience. Should you still need assistance for information purposes only...

Initially, a little more background info please:

  • • has it been in storage for a length of time;
  • • is this a sudden recent issue;
  • • or slowly developing while in use;
  • • any recent work, repairs or mods done.

Still, the description of "...gets hot the front cylinder starts misfiring...lose power and it finally quits..." could possibly be a front cylinder(s) starvation / fuel delivery issue and/or front ignition related. Proposed preliminary tries (if have not been done):

  • • test for presence and consistency of spark;
  • • replace the spark plugs;
  • • determine burn color of the old spark plug tips;
  • - if black/sooty, then rich and/or vacuum leak issue @ the intake/after the carb;
  • * ensure vacuum integrity at the intake manifold;
  • - if oily, then an internal engine problem;
  • - consider a compression test or better yet, a leakdown test;
  • - if very light brown to whitish, then lean and/or an air leak concern @ air box/coupling/before the carb;
  • • check the air box and air filter/element;
  • - ensure tight/correct fit particularly with airbox to carb coupling;
  • - verify air entry is only through the designated opening;
  • • consider carb pull-down and cleaning;
  • • check the front ignition system;
  • - determine if the front ignition coil is overly heating;
  • - test for presence & consistency of IGN+12V on the black/white wire to the ignition coil;
  • - pulsating voltage on the other wire/terminal with the engine running
  • - for test purposes, carefully swap the spark units;
  • - verify low pulsating voltage from the pulser units / pickup coils.