No spark

[yozzer74]

Hello been a while I've bought myself a 400/400 needs plenty of work doing to it.engine turns over on start button but it as no spark. I've run a wire from battery to the coils to power them which then gives me a spark all be it a tiny one. Does anyone have any ideas what the problem could be. I've also done a compression test on it I'm getting 100 psi across all 4 cylinder.  My gauge is only a cheap thing off ebay so not too sure how accurate it will be. But should it run with that much compression?? Thanks in advance.

[yozzer74]

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[robvangulik]

As you never know how accurate the gauge is, so long as they all have about the same pressure it should run fine.

[Bryanj]

Kill switch or ignition switch could be faulty, clean and reset points and timing. If that really is compression its very low

[yozzer74]

the previous owner as fitted a new kill switch so that should be good. ill check ingnition switch out thanks

[yozzer74]

the bike is showing 28000 miles on clock .its not been run since 2009.

[Bryanj]

With that time stood point def need cleaning, setting and timing doing also possible rings are stuck in pistons so be very carefull running it

[Bryanj]

If he happens to have fitted the kill switch from a 400 twin it would work backwards as the switch is totally different electricaly

[yozzer74]

how would i know if hes done that then ??. also were is the best place to get new mudguards& Seat  for it david silvers ?

[Bryanj]

Just try for spark in both on and off position.
Mudguard and seat at Silvers but sit down before you check price!

[Moorey]

Even with a crap gauge 100psi is way low.

[yozzer74]

no lights work only the oil light and start button. no i didnt hold the throttle open does it make a diffrence ?? ill give it a go like that see what results i get thanks

[mattsz]

no i didnt hold the throttle open does it make a diffrence ?? ill give it a go like that see what results i get thanks

I made that mistake... once.  Afterwards, I modified my compression test gauge to prevent future screw ups...

[Bryanj]

At least you didnt write it on the glass!!

[mattsz]

At least you didnt write it on the glass!!

I'm certainly a dumbass... but I'm not stupid!!!