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

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

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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.
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11. Vacuum piston assembly malfunction.
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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
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Feb 20, 2011 | Harley Davidson XL 883C Sportster Custom...

1 Answer

Bike keeps stalling.at first start up is normal choke out runs ok until it gets about warm up time to push in choke then it dies.will not start back up unless ing. And run switch are reset. Does not want...


Ok, Never use the enricher anymore than you have to. It's way to rich on every CV carb I've ever seen. It will foul your plugs. I start my bike with the enricher on but as soon as I can keep the bike running at a fast idle with the throttle tension screw on the bottom of the throttle grip, I set the screw to hold the idle at about 1500 RPM or so until the engine is completely warm on the top end. When the rocker boxes start to feel a bit warm, I'm ready.

Now, when Harley came out with the Twin Cam, I quit working on them. I work only on the older models, Evo powered and older. The reason is that Harley went to electronic engine control modules. This sounds a lot like what you've got.

To cure your idles problems, once you get your engine to full operating temp, set the idle speed using the throttle stop screw at the carb. Take the air cleaner outer cover off and you should be able to see the screw at the top front of the carb. Clockwise speeds the idle up. Now, the engine is not going to idle correctly until it is completely warmed up. That usually takes at least five miles of riding or so. Until then, you must keep the idle set with the throttle grip.

The alternative to this is a fuel injection system. And, you only think you have problems now. Read some of the problems those people have on this forum. I'll keep my '94 FXDWG.

Good Luck
steve

Sep 29, 2010 | 2000 Harley Davidson FXST Softail Standard

2 Answers

I have a yz250f 2001, and it splutters at low-mid rpm. Once you get the revs up, you can keep them there if you nail it ?? It runs fine??


Assuming your valves have been checked, and the air filter is clean...
You carb has an accelerator pump, and these can get corroded. Make sure your carb is thoroughly cleaned.
There is an air idle adjustment screw on the bottom, that will affect starting, and idle.
The last issue could be a slow jet that may be too rich or lean. This will affect from idle to 1/4 throttle. The best way to read it is run it there for a while, and remove the plug to see the color. Too white is lean, and black sooty is too rich.

Nov 21, 2009 | Yamaha YZ 250 F Motorcycles

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

Whats the adjustments on a 1996 kawasaki vulcan 800 carburetor. the bike seems to blacken the plugs and run sluggish. it was rejetted however im not sure if the carb was adjusted for the new jets. im...


oem specs run lean if you rejetted and plugs are blacken running rich try air screw first alittle at a time (replace plugs) keep rechecking plugs as you go same diff. if you adjust fuel screw

Jul 13, 2009 | 1996 kawasaki VN 800 A Vulcan

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

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