69 BSA Rocket3... the Unholy Virgin

[Jeff L]

needless to say, this has been kicking my ass. Can anyone shed some light on why the mark on the crank wont sit at the 12 o clock position? I put a tdc plug in the front of the case & brings me to 38* BTDC. The pic shows where the mark lines up.

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When I put the timing gears in,I lined the crank gear at 12 & set the cam gears to that (its no wonder I have no compression). Also what does the F.A. stand for

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[gearhead1951]

F.A. = Full Advance

[Jeff L]

Thanks, I realized it a little while after I posted the ?. Any clue about my timing mark? Should Zi just disregard it & make a new mark?

[gearhead1951]

Triumph is always timed at full advance , not tdc !!

[Jeff L]

I have no clue what is up with the marks on the crank & cam gears. Don't know where this had different cams put in it or what. When piston is at TDC the intake is still closing. I set to time the valves off the other side & at TDC the mark on crank gears is 8 teeth off. After playing around I set got to where both cam gears were also 8 teeth off their marks. Took compression test & coming up low (figured because of new rings). Shot a little oil in the cylinders, & came up to 120lbs. I'm at the point now where I can get it started, but it won't stay running. I think it's starving for fuel. So now I have to take the carbs off & check float levels & make sure they're all clean(I had gas in the tanks all winter & think it went bad. Little bummed, but I sure liked hearing it fire. Can't wait till I can hear it running.

[gearhead1951]

Sorry , IGNITION is always timed at full advance but the valve timing is done at 38 degrees BTDC !!

[Jeff L]

When the mark on the crank gear was at 12:00 piston was at TDC. Unfortunately for some reason it put number 3 at TDC not number 1. Ignition is set at full advance at 38* BTDC. I got past all that & it does fire, just cant keep it running, pretty sure cause its not getting enough fuel. Couple posts up I screwed up what I was saying. In that pic piston number 1 was at TDC. Look how far off the mark is. That is where I was having all kinds of problems.

[hansgoudzwaard]

When the mark on the crank gear was at 12:00 piston was at TDC. Unfortunately for some reason it put number 3 at TDC not number 1. Ignition is set at full advance at 38* BTDC. I got past all that & it does fire, just cant keep it running, pretty sure cause its not getting enough fuel. Couple posts up I screwed up what I was saying. In that pic piston number 1 was at TDC. Look how far off the mark is. That is where I was having all kinds of problems.

Good to hear you are closing this out. I had an old BSA that kept stalling /flooding because of leaking floats; allowing too much fuel in.

If you are at TDC on the compression/firing stroke on #1 and you are positive both valves are closed, I guess there isn't much you can do about how far off the mark is ??

[Jeff L]

Yeah it seems to have good compression, & I'll be pulling the carbs back off to recheck floats. I'm trying to find spec on slide wear if there is one. Maybe install new float pins. I just hope it sorts out without having to buy new carbs.

[Jeff L]

Seems all the problems I've had trying to time the valves resulted in having some of them bent. Did a leak down test & there is some gas leaking through the seats. I have to send the head out, but unfortunately thats on hold.

[Jeff L]

Thought I posted this but it’s not here so, I’ve had my fill with trying to get this triple running. I pulled the engine & sold it. It was a hard choise being I had so much time into it. It will now be redesigned & new power plant put in its place. Check out the next thread.

[budoka]

geez, man sorry to hear that. i hope the next one shows you a bit more love.

be looking forward to the next thread.

-dan

[Jeff L]

Yeah it sucks, but I’ve gotten some work done to the frame so I’ll be starting another thread soon.