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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 11-13-2012, 09:34 AM   #11 (permalink)
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Hard to cold-start indicates a lean pilot mixture.

Few things might help:
1. Bump the pilot jets to 42
2. Check your entire intake system for leaks. Cracked rubbers, degraded o-rings and degraded vaccuum caps are likely culprits.
3. Lean out your idle mixture screws to around 3 turns.
4. Check your spark plugs and replace if necessary (takes 20 minutes).
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Old 11-13-2012, 09:46 AM   #12 (permalink)
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When's the last time you had your valves checked?
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Old 11-13-2012, 10:32 AM   #13 (permalink)
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Originally Posted by Forchetto View Post
What leads you to think she's running rich?.
Not great gas mileage and it smells like it runs rich to me. I'm a complete newbie so I could be completely wrong. I haven't had anything tested to confirm that suspicion.
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Old 11-13-2012, 10:48 AM   #14 (permalink)
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Check out the easiest and most obvious things before tampering with mixture screws and jets.
1/ Air filter.
2/ Spark plugs.
3/ Vacuum caps. They're the little black rubber bungs, (2 on top of each carb manifold) they're notorious for perishing.
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Old 11-13-2012, 10:57 AM   #15 (permalink)
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When you try to start your bike, DON'T touch the throttle until it's running.
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Old 11-13-2012, 11:09 AM   #16 (permalink)
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Originally Posted by denbow View Post
They normally start 1st crack even in cold weather. FULL choke, no throttle. Once started keep the choke out and slowly return to half way as it warms up.
Yes they're slow to warm up and don't reach full temp for 15 minutes so you might need to goose the throttle a little at junctions and in traffic until it ticks over on its own.

Make sure the two wires on the bottom each carb are intact and connected. They're the cold weather carb heaters that come on automatically under a certain temperature.
+1, yes mine starts first go hot or cold, do same as above.

Plasma.
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Old 11-13-2012, 12:50 PM   #17 (permalink)
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Originally Posted by wenzel850 View Post
When you try to start your bike, DON'T touch the throttle until it's running.
I will try it. What will this do?
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Old 11-13-2012, 12:55 PM   #18 (permalink)
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If you twist the throttle whilst pressing the starter button the carbs will flood with fuel and can soak the spark plugs = bad or no start.
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Old 11-13-2012, 12:55 PM   #19 (permalink)
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It prevents flooding...
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Old 11-13-2012, 01:00 PM   #20 (permalink)
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Originally Posted by sillymike View Post
When's the last time you had your valves checked?
Hmmmm. I don't know. I'll have to check the records that came with the bike from the previous owner. I've only owned this bike for 6 weeks or so. It has been well maintained with all the records included. I feel like I may need to take it to the local dealer and have them do a once over.
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