Question about Triumph Bonneville Motorcycles

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1978 t140v running rich

Fitted boyer ign system and power box cannot now achieve good idle speed plugs blacken very quickly

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OBVIOUSLY THE BIKE IS RUNNING HOT THE FIRST THING TO TRY IS HOTTER PLUGS BLACKENING IS CAUSED BY EITHER RUNNING RICH THROUGH ELECTRICAL PROBLEMS WRONG PLUG HEAT RATING SO IF DIFFERENT PLUGS DONT WORK ITS GOING TO BE ELECTRICAL MISSFIRE THEN YOU NEED TO BE LOOKING AT HOW YOUVE WIRED THE PARTS THAT YOU HAVE ADDED

Posted on Feb 15, 2009

  • charles lill Feb 15, 2009

    CHECK THE FLOAT STTING 24 MM MAIN JET 105 38 IDLE JET 3RD NOTCH FOR NEEDLE 13/8 TURNS ON AIR MIX SCREW /CHECK FLOAT FOR HOLES OR THE BOWL VENT MAY BE GUMMED FINALY CHECK TIMING .012-.014 OPEN AT THE F MARK

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1 Answer

Why won't my Bruin idle for more than 20 -30 seconds?


Running too rich. Choke on? Clogged air filter? Dirty carb?

May 02, 2015 | Motorcycles

1 Answer

How do i stop the engine running at a fast idle


Assuming it is a completely mechanical system with no electrical or electronic control there is no actual fast idle facility unless it is provided by a Waxstat cable device fitted into the cooling system.

I think what you mean is the engine idle speed is too fast rather than it is running at "fast idle" which is a term used for a raised idle speed when an engine is cold and decreases as the engine warms until at normal operating temperature the idle speed should be normal. On an old diesel engine it is the Waxstat device if fitted that provides this facility or a hand operated throttle. Very old cars and trucks had hand throttles for fast idle but later this function was provided by the choke or strangler mechanism. Some luxury cars had an electrical device fitted but the fast idle of modern engines is invariably provided by electronics.

I expect you need to adjust the throttle stop screw of the injection pump. This is at the lever where the throttle linkage connects to the pump and there is generally two stop screws fitted that limit the travel of the lever. One screw limits the maximum travel of the lever and therefore the maximum engine speed and this is generally set during manufacture or remanufacture and sealed to prevent tampering.
The other screw is the idle screw which the lever is pulled against by a spring when at rest.
Before adjustment it is necessary to ensure the throttle linkage is not maladjusted and preventing the lever contacting the stop. Disconnecting the linkage until the idle speed has been adjusted will ensure this and then slacken the stop screw locknut, start the engine and turn the screw in or out as applicable until the desired idle speed is achieved, allow the engine to warm up and make further adjustment if necessary and tighten the locknut and reconnect the throttle linkage. Do not adjust any pump screw except the idle screw.

Good luck!

Mar 01, 2015 | John DEERE CONSTRUCTION LOG SKIDDER NIP...

1 Answer

Runs rich, fouls plugs, doesn't idle properly...with or without enricher and idle adjust. Has 80,000km, is an '05. Was quiting and shooting gas out the carb. Been an off and on problem from the...


Hi Spinner3507, and the usual suspects are:
1. Idle speed improperly adjusted.
2. Intake manifold air leak.
3. Loose low speed jet.
4. Contaminated or plugged low speed system.
5. Enrichner valve not seated or leaking.
6. Leaking accelerator pump.
Good luck and have nice day.

Aug 28, 2011 | 2005 Harley Davidson FLSTN- FLSTNI Softail...

1 Answer

My 1994 Sportster is running rich, how do i make it run leaner??


Hi Ctabe8b, and the usual suspects are:
1. Excessive use of enrichner system.
2. Enrichner valve not seated or leaking
3. Dirty air cleaner element.
4. Restricted fuel tank vent system.
5. High speed riding style.
6. Idle speed improperly adjusted.
7. Loose jets.
8. Float level too high.
9. Plugged or restricted bowl vent.
10. Worn or damaged needle or needle jet.
11. Vacuum piston assembly malfunction.
12. Plugged air jets or passages.
13. Excessive accelerator pump output.
14. Main jet too large.
15. Imporoper tire pressure.
Good luck and have nice day.

May 31, 2011 | Harley Davidson FLSTNI Softail Deluxe...

1 Answer

As soon as i start my harley the spark plugs get sooted


This is typical. Whether you use the "enricher circuit" on a carburetor or the electronic injection system senses your engine is cold, your engine is being started with an extremely over rich mixture. Once the engine warms up and you either disengage the enricher or the engine temperature sensor senses the engine is warm, the mixture leans out. Still the idle mixture is overly rich but when running down the road, it should lean out to about a 13.5:1 mixture.

Try this, install a new set of plugs in your engine. Start the engine and ride a normal pace of about 50-60 mph for about ten miles. Then, pull in the clutch and hit the "Run/Stop" switch killing the engine instantly. Do not let it idle. Carefully pull off the road downshifting the transmission as you slow down. Do not downshift the transmission too quickly, Wait until the bike slows down to the proper speed before you shift. Once you've got the bike stopped, pull the plugs out of the engine and look at them. They should be a brown color indicating the proper mixture.

Good Luck
Steve

Feb 20, 2011 | Harley Davidson XL 883C Sportster Custom...

2 Answers

The locations of both sets of points in a 1976


It has been a while... but I believe there is a round access cover about 2" in diameter on the right hand side of the bike, forward part of the engine.

That corresponds with the end of the exhaust camshaft. 9_11_2014_6_00_28_pm.jpg
In this photo, it is chrome plated. They are held on by two philips head machine screws.

The points themselves are mounted on two plates. The first plate adjusts both sets of points, the second adjusts the difference in the two sparks.

cf5116b7-5bf5-47c3-a398-0ea6930239d6.jpg

That said, you might be on a wild goose chase. Most of the older T120s and T140s have already been converted to Boyer electronic ignition systems. MUCH more reliable, and much less maintenance. Smoother, and more precise as well.

Boyer conversion or not, the access plate in in the same place. It just might be a "pointless" ignition.

See these guys - they have very good telephone support - and will have Boyer kits in stock.

British Cycle Supply, item 331 Series Boyer Electronic Ignitions

Jul 30, 2009 | 2001 Triumph Triumph Bonneville

2 Answers

Point location


The points cover should be on the right hand side of the engine, at the end of the exhaust cam shaft.


point-location-xkwbzaj4qs1t5fjdyiiqbxtt-2-0.jpg
It is possible that the original plate was replaced by an aftermarket version with cooling fins. That doesn't do much, but it *looks* cooler to some eyes.

Most of these bikes have been refitted with Boyer ignition kits, so under the plate the points are no longer there. They are likely replaced with a sensor and magnetic sensor. That is a MUCH more reliable and maintenance free system.

If you do still have points, there will be two contact sets. The entire disk shaped plate will rotate to adjust timing and a smaller partial plate containing the second set of points can also be adjusted. That gives you control over timing, and difference between cylinders.

Really, I was a stickler for "original" on my bike, and I regret not changing to an electronic Boyer system as soon as they became available. Go for the upgrade. It's well worth it. A good shop can have it done in an afternoon, and you will never have to think twice about ignition or timing again.

Boyer Electronic Ignitions
http://www.britcycle.com/products/331/331_series.htm

Jul 30, 2009 | 2001 Triumph Triumph Bonneville

1 Answer

I have a 1978 Yamaha DT175E. It is runnig rough like runnig rich but idles ok put on a new carb checked autolube oil pump and timiing,found that runs better when air box is not conected to carb but still...


Check the choke to see it is not stuck on.
Something is causing the bike to run rich as you said.
Make sure the throttle slide isn't stuck and is working ok.
Try a smaller size jet.

Jun 12, 2009 | 1974 Yamaha DT 360

2 Answers

Ryobi PBV-30A Carb problem


I have a rayobi PBV30A petrol trimmer and it keeps dying once you increase the throttle speed runs on idle.

Feb 17, 2009 | Ryobi Garden

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