Triumphrat

Ming

Hi all,I'm new to this site so first I had better introduce myself ,my name is Bill originally from England,now living in the Charente s w France.Yesterday I took delivery of a 72 tr6r,it has been restored several years ago engine fully rebuilt restoved frame etc this was in 94,Ive got the reciept for the engine rebuild,then the guy who went to all this expense must have lost interest coz its only done 130 miles since,Ive got the old mot certs.Obviously I need to run in the engine,but how long for and at what rpm,this is where the problem lies,the bike starts first kick every time its got a boyer ignition and idles sweetly at just over 1000 rpm but on the road it wont rev over 4000rpm if I open the throttle at this engine speed the motor dies as if I had closed the throttle,can't get my head round this one,any help greatly appreciated,
Great site,
regards,
Bill.

GrandPaulZ

Welcome.

Quite likely you are closing the enricher "choke" slide, instead of opening it. To open it, you must draw up the cable completely with the lever.

If this isn't the problem, you may have totally blocked air filters, or your timing is set incorrectly. Could be other issues, byut these are the most likely.

You'll need to strobe time the ignition to get it right.

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GrandPaulZ
Author of "Old Bikes"
Born Again Bikes
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Ming

Thanks for the promt reply,the ignition was strobed when the engine was comisioned after the rebuild, not been touched since,am I correct in thinking the choke is in the off position when the lever is under tension? I tried riding the bike with the air filter removed this made no difference .I took it out for a short ride today, 7k checked the colour of both spark plugs afterwards they were the normal sandy colour,there is no popping back on the over run it just won't rev ,above 4000 ish,
Bill.

tangomike

Did you replace the spark plug wires? If so did you use resistive wires? If not the Boyer will die like that at high RPM. Too much noise. Unless it is the analog Boyer. Just a thought.

TangoMike

Ming

Hi finally got to the bottom of the problem,my mate in England traced the chap who had the engine rebuilt he said it had been set up so it couldn't be over revved during the run in period,I had a look under the points cover and found the boyer had been set fully retarded,Ive advanced it about half way its a lot better now,got a strobe light on order will be here next week ,Ive never used one on a boyer before what is the best way to do this,
thanks,
Bill

GrandPaulZ

Pull the bike out on to an open driveway and set up a large fan pointing at the front of the engine. Park a car close to the work area, so that you can connect the timing light's power leads to the battery.

Clip the inductive pick-up to the spark plug wire, remove the timing window on the primary cover, remove the ignition trigger cap and slightly loosen the two pillar bolts so you can adjust the stator plate. DO NOT press on the two small coils to rotate the plate, but instead use a small screwdriver pressed against the edge of the screw slot at the top of the stator plate (tap the screwdriver with another screwdriver's handle if need be).

Inviting two friends over to assist will make the job easier, one to start the bike and rev it, one to hold the timing light pointed at the rotor mark, and one to adjust the stator plate's position.

Rev the bike up to 5,000 RPM and set the timing on the mark of the rotor. It sounds like death, but that's how it's done.

__________________
GrandPaulZ
Author of "Old Bikes"
Born Again Bikes
My Photo album

Ming

Thanks for that seems pretty straight forwards,there are two timing marks on the rotor is this normal?
Bill.

Ming

Hi again ,Ive now tried all of the above nothing has changed,the spark plug leads look new but I dont know if they are the correct ones.they are bougicord 403 classic,it also reads "autoradio" on them,possibly they should be on a car? any idea's guys?I was on the phone to Norman Hydes in England yesterday they have not a clue as to what this problem is and nor do I ,I should add that when I strobed the timing the bike revved to 5000rpm no problem but when on the road it cuts out around 4000rpm,when I roll the throttle back it picks up again,I'm completly baffled.
regards,
Bill.

Tiger Dale

Check the battery voltage. Motor off, headlight on for 1 minuite. Should ne no less than 12 amps.

jimmy bush

Amps or volts?