First off - hello
I've had an NSR250 MC16 for about a year now, bought it as a tired old dog and have been stripping it down and cleaning everything up. I started to assemble it earlier this year, got the rebuilt suspension on, fitted the engine, carbs etc and tried to fire it up. It spluttered into life for about 5 seconds and the died, checked it had a spark, found none so left it in the garage and went out for the summer on my other bikes. Now the winter is coming it's time to get back to building the NSR. I have checked and found that the rear cylinder has a spark but none on the front. Changed the coils around and again, rear sparked, none on the front so it's not the coil. I checked both coils were earthed and that seems fine so traced the blue and black wire to the black box under the plastic tray beneath the tank which is fine, no breaks.
So, now I'm stuck with a sealed black box and have no idea how to check whether that's the problem, is there a way to test these things? The serial number on it says KV3 C1530A and there's a small mark on the back - 7.2 and then 282. I thought about swapping the black boxes around to see if that made a difference but the other one has slightly different numbers on it so didn't want to risk blowing it....
Hope someone can help, from what I've read on here you lot seem to know what's what with these bikes.