Repairing Triumph Triple 900 Gill ECU/Ignitor - Component identification

[lukejjames]

Hi Eevblog Community,

Long time reader, first try at a repair. So be kind if I don't use correct terms  Make a long story short I have been working on getting a 1998 Triumph 900 running and had no spark on one of the three coils. Determined it was not the coil by switching the leads of the working coil with the one that was not working and it sparked! So I opened the unit and started to probe. The coils are wired to +12 and to the collector on the tip152s; one for each coil. The signal on the base of the of the tip152 (TR11) wired to the non sparking coil was very weak when compaired with the signal on the other two, so I swap the driving transistors TR3 and TR4 with TR8 and TR7. Yay it worked! now the non-working coil was firing! but of course TR9 was failing.. So I need to order a replacements for TR4 and TR3. The problem is I can't seem to identify replacements

Im guessing TR stands for transistor

I attached two images one of the whole board and one of the two SOT-23's im trying to identify. But have not had much luck on google. Any assistance would be great.. Im pretty sure they are npn transistors but would like a second opinion

SOT-23?
Markings
TR4 - G6B (44?)
TR5 - C6

I goofed on the pic - shows TR5 and TR6.. 

[carpelux]

if You look at the GM4PMK's SMD Codebook

G6B = BC817-25 (leaded BC337-25) and C6 =MMBA811C6 (leaded 2N5086)

[lukejjames]

Hey Thanks carpex

Still having a bit of a hard time finding replacements..

Does it have to be a pnp EPITAXAL transistor ("a bipolar junction transistor made using vapor phase deposition")
or will any pnp bipolar junction transistor within the same spec work?

thanks again

[wagon]

I reckon if the specs are about the same it should work.  I myself fixed one of those a while back ; it had a dead channel too, but it had a dead coil driver transistor.