Question about Motorcycles
Your stator test is only valid if the battery is dead and the bike cuts out, not viable for a starting problem. The backfire is a normal thing on these bikes (assuming you are talking about letting off the gas when doing 4k+ rpms). If the bike doesn't start, test the fuel and spark.
Posted on Mar 30, 2014
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Posted on Jan 02, 2017
SOURCE: overcharging battery!?
If it goes over 17 then there is definitely a regulator fault, regardless of what the stator is doing. The very purpose of the regulator (it 'regulates' the voltage within limits) is to NOT allow the output dc voltage to climb when the stator output rises (normal) with increased engine rpm. In other words - by nature of way it works normally, the stator AC output Voltage will rise as the engine rpm increases - it will continue to rise all the way to peak engine rpm. The Rectifier/ regulator with its double-barrel name performs two functions: the first - rectifier - converts the AC output of the Stator to DC volts - if 'UN-regulated' the DC volts would also climb proportionally to engine rpm. But that is where the second function of the Rectifier/Regulator - the Regulator - comes in. The Regulator's job is to stop the voltage rising over a certain threshold even if the stator is trying to drive it higher. It does this by 'shunting' current to ground (short circuit effectively) in a series of pulses; this controlled operation is called regulation. The limit is going to be 15V absolute max and more typically 14.5 or so. If the output rises about this value then it absolutely is NOT regulating. Failures of the regulator where they simply don't regulate and allow full voltage to pass are rare (but not impossible) - much more likely to be short or open circuit, neither or which would give the symptom you have. It still sounds almost like you maybe wired it incorrectly? The stator is inside the left crancase cover - whether or not it has its own problems, have nothing to do with the lack of regulation causing battery volts to go to 17V.
Posted on Nov 10, 2008
SOURCE: 2003 Yamaha R1 not charging
Stupid Question but are all your wires clean and tight connections? Also make sure your batt ground is good too. R1's can be picky like that.
Posted on Nov 15, 2008
Posted on Mar 23, 2009
your voltage/reg. can be tested in a couple different ways check ground res. check res. then revs. bias on diodes you have ac in dc out it sounds like you may have a diode gone bad allowing ac curent to flow causing the wires to get hot
Posted on Jul 31, 2009
Assuming you can get it started after charging the battery, put a volt Ohmmeter on the battery with the engine running around 3000 rpm. The reading should be around 14 volts. If it is, then the stator is fine. It is on the left side of the bike under the cover.
There may be a loose / dirty connection somewhere on the bike. Remove the seat and gas tank to gain access to the wiring harness. Get a volt Ohmmeter as you may need to check continuity at some point. Start at the battery, then fuses and the wires connecting to the fuses. Inspect for burned wires, abraded wires, loose and/or dirty connections, bad connectors and loose wires. This means the mass of wires inside the headlight must also be inspected. Check the handlebar kill switch and the side stand kill switch as well. Go all the way to the ignition system. Check the key switch. Put it on "run" and check for power through the switch as you jiggle the wires. Find the bad connection and you should be able to fix it.
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Posted on Sep 02, 2009
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