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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 04-02-2009, 05:19 AM   #1 (permalink)
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bike won't start after winter layup

Hi my 04' bonneville has been unwilling to start this season. Last year I admit
I was negligent in properly storing the bike. I was working out west and while
there removed the airbox and re-jetted but only had time to ride once after
re-jetting just to make sure everything worked. The next day I had to head back
east and trailored the bike home. Once I got home it snowed overnight and sadly
the bike sat in the snow for an afternoon. I then cleaned her off and brought
her into the livingg room where she sat all winter.

I did drain the floats but forgot to unhook the battery! This spring I took it
outside and cleaned it and then tried to start it. It turned over the first
time but didnt fire, after waiting a few minutes it turned over again and
caught but only barely, it putt-putted away for a minute or so and then
died. This was the best I could get.

I then took the carb bowls off and cleaned out both carbs with carb cleaner, I
installed a brand new battery and new spark plugs, I also drained the tank and
filled it with fresh high octane gas. It has yet to get warm here, temps around
the freezing mark while trying to start the bike and I hope that this weekend
it will get much warmer and that will help but other than that I do not know
what the next step is...

I am confident I am getting spark, but maybe will pull a plug and hit the
starter to make sure. The battery off a fresh charge is 13.02 v thereabouts and
only drops down to around 8 or 9 volts with the starter running, does that
sound ok?

I guess I am wondering what the next step in the trouble shooting process is?
Thanks!!
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Old 04-02-2009, 06:59 AM   #2 (permalink)
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Most put stabilizer in the gas tank to keep the gas from going bad if the bike has sat for a prolonged period. Hard to say if your gas is good or bad. If you are getting spark...consider putting fresh gas in the bike. Generally if the starter will spin you have enough juice to fire the bike.
Good Luck,
George
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Old 04-02-2009, 08:31 AM   #3 (permalink)
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I'd be checking the airfilter to make sure that it is clean and clear, maybe some hibernating critter has built a home in there?
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Old 04-02-2009, 08:35 AM   #4 (permalink)
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George, he did put in fresh gasoline.

The next thing to do now is to put the new battery on a battery tender while you wait for warmer weather. The start attempts drain a lot out of it. Put a few ounces of carb cleaner in the tank for good measure.

Make sure you're using the choke to start it, and wait for the warmer weather to try it (disconnect the battery tender first). Do not give any throttle when starting.

If you can't wait for warmer weather to try it again, you could aim a forced-air space heater (at the low setting) at the engine for an hour or so, from a respectable distance.

The other thing that's been mentioned before is check your air filter and exhausts for mouse nests and such.
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Old 04-02-2009, 11:16 AM   #5 (permalink)
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I have to admit my Bonnie was quite tough to start after it's first winter of storage.

When you removed the airbox, did you put new pilot jets in?
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Old 04-02-2009, 02:53 PM   #6 (permalink)
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Thumbs up No Start

How old is the battery?? As stated - you can put a space heater/ heat lamp to give it a boost. These things are REALLY hard to start in the cold, so ANY help you can give wikll help! I couldnt start mine (5 yr battery) & got a NB batt. Gave it what it needed to go. The old battery holds a full charge but just doesnt have it to get it going when cold! A little shot of starter fluid might help a bit? Doesnt sound serious tho. The new batt from NB seems to be a GOOD one. All is well now.
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Old 04-02-2009, 03:24 PM   #7 (permalink)
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How long was the bike down? Did refresh the gas after 1.5 months? Did you run the fuel out of the bowls before storing? I mean did you shut the petcock off and run it until it died or drained the fuel from the bowls? Did the fuel smell like varnish before you drained it out of the tank? Probably did! Did you use any stablizer?

If you did none of this then your looking for a carb clean up and rebuild. More than likely the mains and pilots are gummed up. Worse case scenario, if you you left it too long it could have etched the carb bodies and you'll need new one's.

If you used carb stabilizer it only lasts for about 2 months tops and doesn't protect the carbs from corroding. Check the tank for corrosion and pull the petcock filter and check it for clogging from bad gummed fuel.

Eitherway it sounds like a carb clean up and rebuild.

Cheers

Jeff:
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Old 04-02-2009, 08:23 PM   #8 (permalink)
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Two words...
Battery and gas...
Oh yeah! the CVK 35' gunk up really good!
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Old 04-05-2009, 09:21 AM   #9 (permalink)
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music to my ears!

Thanks for all the advice, it finally warmed up this morning to a few degrees above freezing, and the sun was on the bike for a few hours, it then roared to life!

thanks again!
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Old 04-05-2009, 09:35 AM   #10 (permalink)
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Excellent! Glad to hear it! I remember mine being very cold blooded after pulling it out of storage the first year. The first roar into life is glorious!
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