Slow Cranking and backfire
11-07-2011, 05:15 PM
#1
Junior Member
Squid
Thread Starter
Join Date: Apr 2011
Posts: 4
Slow Cranking and backfire
I have been having some trouble starting my 98 VTR (It seems that the battery just had a low charge). At first I thought that the 35 degree weather had something to do with it since it hadn't been started in about 2 weeks. So I hooked a jumper box to it and tried to start it and it cranked fine and then backfired. So I let off and then tried to start it again and it started then backfired again. I rode the bike around for a while and left it running enough to charge the battery. But when I tried to start it this morning it seemed dead. Does this just seem like a battery issue? WHat made it backfire?
11-07-2011, 05:21 PM
#2
Senior Member
Superstock
Join Date: Jan 2011
Location: Santa Clara, CA
Posts: 258
I have been having some trouble starting my 98 VTR (It seems that the battery just had a low charge). At first I thought that the 35 degree weather had something to do with it since it hadn't been started in about 2 weeks. So I hooked a jumper box to it and tried to start it and it cranked fine and then backfired. So I let off and then tried to start it again and it started then backfired again. I rode the bike around for a while and left it running enough to charge the battery. But when I tried to start it this morning it seemed dead. Does this just seem like a battery issue? WHat made it backfire?
And how old is your battery? If it's low on acid/charge at all it's gonna cause some problems and manifest oddly.
As well, what are you charging at? If you've got a bad/failing R/R it can prematurely wreck your battery/bike and cause some problems elsewhere on the bike.
I've got some problems with starting at 6am when it's cold out because I'm running waaaay rich right now so that could be another problem. Check out the "Carb Set Up" thread. A member on here (Mike "8541Hawk") set up a really good instruction to set up your carbs.
Another thing to think about is the spark plug temperature. They all have ratings and stock they come as in the middle of the heat range. You can get hotter plugs if necessary, but the stock one covers a pretty good spectrum if the carbs are set up properly.
11-07-2011, 06:22 PM
#4
Senior Member
Superstock
Join Date: Jan 2011
Location: Santa Clara, CA
Posts: 258
Whoopsies; brain fart. We've got sealed batteries. So if there's a problem with the battery then it comes down to replacing it.
R/R will blow gauge lights in first stages and then destroy much more valuable parts after the problem gets worse. It's a known problem with our bikes and it's quite an easy fix.
The way you wanna check that is by checking the charging voltage at idle and at various rpms.
R/R will blow gauge lights in first stages and then destroy much more valuable parts after the problem gets worse. It's a known problem with our bikes and it's quite an easy fix.
The way you wanna check that is by checking the charging voltage at idle and at various rpms.
11-07-2011, 06:52 PM
#5
Senior Member
MotoGP
Join Date: Jul 2010
Location: Phoenix, AZ
Posts: 3,869
I think in lesser cases they just undercharge... I you have a voltmeter it's easy to see how it's doing. Just test the voltage at different RPM's to make sure it's within the ideal range.
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