Dyna acceleration issue.
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From: along the shore of Mishigami
Makes me wonder about the bikes maintenance history. If the previous owner changed the cam chain shoes and the oil pump wasn't reassembled right and allowing the engine to sump oil, as previously mentioned. The sump is usually "dry", if oil is collecting in the sump the flywheels are spinning into the oil adding resistance to the spinning flywheels. Also certain years had the wrong size injectors, not providing enough fuel.
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Joined: Jan 2020
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From: Saint Augustine Fl
It almost feels like its skipping on gas for a sec but i guess it does feel like the brake catches for a sec. Ill check that asap for sure. I didnt have the o rings the other day when i did all that work, now i do
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From: poway
Another thing to look at is the external fuel line.. The locking detent ***** wear into the coupling and allow the fuel to shut off. If the issue is common, you can try holding up on the coupling to see if it cures the problem.
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From: New Hampsha
Maybe I missed it, but did you say it just started doing this recently, or has it been that way since you got it? It really sounds like it goes too lean or too rich in that RPM and load range, which would be a tuning issue, but it wouldn't have just come about.
Rule #1: when something goes wrong, undo the last thing you did.
Rule #1: when something goes wrong, undo the last thing you did.
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Joined: Jan 2020
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From: Saint Augustine Fl
Maybe I missed it, but did you say it just started doing this recently, or has it been that way since you got it? It really sounds like it goes too lean or too rich in that RPM and load range, which would be a tuning issue, but it wouldn't have just come about.
Rule #1: when something goes wrong, undo the last thing you did.
Rule #1: when something goes wrong, undo the last thing you did.
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Joined: Oct 2022
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From: Texas
Just started about a month and a half ago. I thought at first it was bad gas. Fuel fresh tanks later still happening. Tried fuel cleaner, no success. Then like i said, new pump, fuel lines, filter, engine rebuild, etc. still happening. Havent messed with the tune in almost 3 years, been running strong as hell. Gonna try o2 sensors next
I have this cheap fuel pressure tester from Amazon. You have to connect the test line to the intake and then connect the line from the tank to the test line. It ain't fancy but it works.
Edit: Did you think you bought some bad gas or has the bike been sitting for months with ethanol gas?
Last edited by Rusty Springs; Nov 11, 2023 at 09:51 AM.
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Windrick73
Ignition/Tuner/ECM/Fuel Injection
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Nov 2, 2012 12:40 PM
