www.boxertrix.com

made it two miles from the house this morning, and had to turn and limp home,
Bike ran like a pig, not passed 3000rpm this time, and by time I got home I could smell burning and on looking in the exhaust, the pipes were glowing red hot!!
Sounds like I'm missing the ignition spark, and fuel is burning off in the exhaust, Am I right
New HT's needed

Calling Steptoe

Glowing pipes? Lack of power weak mixture or timing out just thinking out loud hall sensor wiring?

Steptoe's the man hopefully he will be reading try a pm just in case

Single or twin spark.................

Twin spark has a coil pack on the main plug so I would think it would just run a bit lumpy.
Just thinking out loud.

Ned

Bikerhoss wrote:Older thread I appreciate, but resurrecting just to ask a silly question.....

I checked my valve clearances (exhausts were a bit tight, inlets a bit slack), and set the end floats, but the bike seems to hesitate between 4-5000rpm? Just needing a balance?
Ta, Hoss.

I would recheck.?
What was it running like before?

Ned -

Bikerhoss wrote:Single spark Steptoe, Ta.

Was staring to run a bit 'coughy' about 5Krpm before doing the clearances, and valves were noisy, but nowhere near as rough as now.

Ok, valves rechecked last night, Spot on still. Plugs out and checked for spark on tick over, fine too. Couldn't see any 'stray' sparking either.
Holding the engine between 3-5K, the bikes splutters and doesn't want to rev, Fair smell of unburnt fuel from the pipes,
Ignition under load problem

http://www.gsshop.biz/

The best advice i can give you is give Neil (Steptoe ) a call

Those of you in the south east if your bike needs a service or other work there really is only one place to go

Based on experience with a different bike have a look at the following.

-Cam timing.

-If you know anyone with a gas tester have a look at the CO at idle.

My triumph Daytona was running like a bag of crap, I discovered that the injectors were all over the place. Bike was running lean with lean pops, misfiring and very, very hot exhaust.


Awaiting more of an expert view.

Hi
Have you checked the rubber covers on the throttle bodies where you coneect your gauges for balancing are not split or perished.?
I take it you set your valves to 0.15 inlet and 0.30 mm exhaust.
All the best
Gus

gus wrote:Hi
Have you checked the rubber covers on the throttle bodies where you coneect your gauges for balancing are not split or perished.?
I take it you set your valves to 0.15 inlet and 0.30 mm exhaust.
All the best
Gus

Yup, valves as you say. The vaccum take-off covers seem to be ok ta.

If it was an airhead, advice on the net would suggest tight/leaky exhaust valves.. What did you set the endfloat at ?
Other suggestions were, lambda sensor or TPS. What about the air temp sensor?

Maybe disconnect the lambda sensor?

Seeing that your bike is older than mine being single spark maybe you should pull off the rubber covers and have a good look if it is perished. My bike started to feel a bit rough and won't hold revs at a steady throttle and sometimes struggled to start when hot. The LH cylinder spark plug was white indicating lean running while the RH one was dark brownish colour. Did the throttle body sync today with a mechanic friend of mine just for me to pick up a bit of experience doing it. I do most of the maintenance myself. When we fitted the vacuum gauge the idle immediately smoothed out and I had a good look at the covers, Yep they were gone. A small adjustment on the LH brass screw brought it in. Fitted new ones and it is as smooth as a twin can be.

Just out of interest we hooked up the exhaust probe and the measurements were very low. CO = 0, CO2 = 14.7 (between 12 to 16), Hydrocarbons = 60 or 0.60 must not be more than 120.

Other usual suspects can be dirt on the cam pulleys, sticky fuel cable, dirty throttle body valves and brass screws, idle cable adjustment or TPS sync if the fault is related to the throttle bodies and fueling. More serious stuff can be a burnt valve (or held open) or bent pushrod. Last one you would notice when trying to set valve clearance.

Much more I can't help. Gus or steptoe is the guys to speak to.

Thanks again guys,
O2 sensor unplugged, cleaned, tried again, Same coughing with or without it. 2nd hand HTs and coil tried, no difference.
Valves def seem to be right clearance, End float at 0.1mm.

To test the injectors, can I just unplug them, clean them, and see if they spew fuel, or is that too DIY?
Same for brass screws, can I just take them right out to clean up?

PS I did pm the guru, but not heard back as yet

The big brass screws just unscrew I'm trying hard to remember if they have o'rings fitted (I'm pretty sure that they do )
O'rings are fitted between the throttle bodies and inlet manifold's but i think you have checked for air leaks

Only re reading this now , have you actually changed the fuel filter? Also Had a good look on UKgser and similar problems were caused by TPS sensor or in one case a break in the loom (wires leading to the TPS) . There was one thread however with similar symptoms(not revving under load) which ended up being the fuel pressure regulator. The onset was more sudden than your symptoms though . The fuel regulator sticks open apparently so clamping the return pipe temporarily will alleviate the symptoms for diagnostic purposes only