b25ss not starting after rebuild

[berniej]

Do you have a fully charged battery? Some EI units will fire too advanced if the voltage is low.

Cheers,
Bernie

[Colin SS90]

As you have fitted EI just check the manufacturers data for spark plug gap. I fitted Electrex World to my SS90 and they state 0.4-0.6mm plug gap which is smaller than the plug gap for points ignition.
Good luck, Colin

[Dennis49]

I think the non starting will be due to the new ignition unit. Could you fit the original system and then try starting the bike. I had electronic ignition on my Greeves Silverstone and it was wired with a large and small spade connector so it was impossible to connect up wrong. However the unit gave all your symptoms.I was told the unit ran clockwise or anti clockwise. Very frustrating. Dennis

[Rookey]

many thanks to all who have offered suggestions it is much appreciated. As i have plenty of time on my hands i have now totally stripped engine down and now in the process of checking each individual part to make 100% sure everything is correct .waiting for new gaskets in the meantime. By the way anyone know where i can get a CORK chaincase gasket.

[Beesy]

I don't know about a cork gasket, but I find that a paper one with a good coating of Wellseal on both side works for me.

Assuming of course that your mating faces are in good shape.

[JOHN KAY]

 HI THERE, THIS MAY SOUND OBVIOUS BUT IF SAY THE CYLINDER HEAD IS NOT FLAT OR GASKET LEAKING GASES > I WOULD DO A COMPRESSION TEST WITH A GAUGE JUST TO BE SURE , ALSO CHECK AMMETER READING WITH EVERYTHING SWITCHED OFF EXCEPT IGNITION AND CONTACT POINTS CLOSED IF THE READING SEEMS HIGH SAY 10 AMPS IT COULD POINT TO A FAULTY COIL AS I HAD RECENTLY ON MY TR25W , IT SPARKED OK BUT WOULD NOT TICK OVER THAT WELL ON VERY LOW REVS AND CARB WAS OK . ALSO CHECK HT LEAD INSULATION IS OK AND FRESH FUEL PREFERABLY 99 OCTANE , I WOULD ALSO CHECK CARB FLANGE FOR WARPING INCASE ITS DRAWING AIR OTHER THAN FUEL . TRY A LITTLE FUEL DIRECTLY IN THE SPARK PLUG HOLE TOO . REGARDS JOHNBOY .

[Rookey]

Thanks for all the replies,very much appreciated. decided to strip entire engine down to examine everypart making sure part numbers and dimensions are correct. Will let yo know how i get on. regards to all.

[Martin S]

I would endorse what Colin SS90 said, I had a similar problem, changed everything in sight several times with no result. Drained the tank and put some new 5 star in and it started immediately.