Params_sweden

I just ran another test as per your instructions. Coil negative to battery negatile, coil HT with sparkplug to battery negative, then scratched coil positive to battery positive. There were no visible sparks at the spark plug, there were however sparks at the scratching positive jumper. In the video I attempted to link in my previous message, he got visible sparks at both the scratch contact and the spark plug. I'll redo the test in the dark later to rule out that the spark is just weak. Newly charged battery should be noted At this point the coil really doesn't seem to give any spark, one more test and I'll order a new one, there's two chinese alternatives besides the OEM ones, I'll try ordering the same one as I have now since I know that it worked. I could've just ordered one right away a week ago or so, but I really wanted to investigate and learn more trouble shooting techniques before doing so. Thanks for your patience everyone! By the way, what does "HT" stand for? (I guessed that it's the "output" from the coil you mean) To be continued / Pär

@Gwbarm I think so as well actually, I'm trying to see if I can make the coil make a spark when connected to a 12v battery, should probably continue testing it. @Mech I tried connecting the coil to a good 12v car battery, I actually couldn't make a spark. I just connected the positive and negative from the battery to the matching terminals on the coil, and touched the coil "output cable" to the negative terminal on the battery quickly, no spark. I'll try one more time like in the video linked below with a spark plug, that method/wiring should give me a spark right? youtu . be/oc941J0wh0Y?t=115 (Remove spaces around the dot, I think the forum might strip any links from new users video is called "How to check the ignition coil for a spark?" by "Help from the Garage") / Pär

Hi, I got out during lunch and concentrated on the ignition coil like many of you recommended me to. Primary resistance is 1.5ohm, secondary 8.56kOhm. Spec says primary 1.8-2.8ohm, secondary 10-16kOhm. I noticed right away that the coil is a replacement part, probably mounted before I bought it. I wonder if it had the same stats when the ATV worked? The resistance is lower than the spec on both primary and secondary, would that result in a weaker or stronger spark you think? Should I do your 12v test on the coil @Mech? Thanks for your help everyone, I read all your comments Off to day care and pick up the kids. / Pär

I really appreciate the enthusiasm here, thanks! I did a test light run a couple of days ago, it's just wired directly to the spark plug without the cap, video attached. The test light is weakly flashing I think, but the spark itself isn't visible to the eye. I found a video of the spark on a Bayou linked below, where the spark is bright and clear when testing at the same spotas I've tried mine on. I haven't had time to look at it this weekend, but should get out and check the things you have suggested in the next few days. I'll concentrate on the electric system for now because of the seemingly non-existent spark. Regarding the carb, it's a China replacement mounted by the previous owner. I haven't checked the carb function at all so far! I got the original carb and it's in as good condition as the bike exterior judging by the look of it, I'll clean it up and mount it in when I get the spark sorted out.. one thing at a time My plan is to start with the "volt drop test", then check the coils, then the CDI. I'll let you know how it goes! @Filthy_Mule777 keep me updated if you find something Bayou spark https://youtu.be/hzZPzaiMRdc?t=90 sparklight.mp4

Hi, I have an EU '94 KLF300 Bayou with ignition issues. I got it last summer and used it for about 20 hours, then one sunny day we used it for about an hour, parked it, and then it didn't want to start again. It has a *really* weak spark, I've only been able to see it once while testing. I'm just getting started on this, I'm going to go through all the weak/no spark trouble shootings from the manual. Since I've already invested like 10 hours digesting the manual and forum threads that I possibly can, I thought that it would be nice to create a thread like this in case I come up with a solution that can help someone else. So far I've replaced the spark plug, I will replace the spark plug cap with a NGK VD05F (5kOhm resistance). I'm going to check the resistance in the pickup coil, stator coil and ignition coil next. I have tried two CDIs, right now I mounted the original CDI which actually gave the most output to the spark plug out of the two A question for you, is it possible to make any assumptions about the CDI by measuring the resistance like in the manual? There's a "resistance table" that you can refer to when measuring between the different connections. I'm asking because I haven't yet seen anyone in the forums that has mentioned that they've measured the CDI resistances and made any conclusions from that. I'll attach a photo of my Bayou Pär, Sweden

Thanks for your input, I'll give the radio test a try in a moment! Like almost every Bayou owner mine has ignition issues, in my case weak spark or no spark, so I'm trying to rule out everything one step at a time. I ordered a NGK spark plug cap VD05F with 5kOhms resistance, it was like 30% of the OEM part price

I found it in the '89 KLF400 manual, for some reason it's not listed in the later manuals. The spark plug cap resistance is between 3.75-6.25 kOhm.

Hi! I'm new to the forums I'm working on my klf300 that isn't starting anymore. I accidentally ripped apart the spark plug cap, and I'm curious to know the resistance of the original part, it's not mentioned in the manuals. If anyone with a KLF300 could measure their OEM or known working replacement spark plug cap I would be very happy NGK for example has spark caps with resistances 0, 5, 10, 15 ohms so it seems to be something that I would like to match as close as possible with the original part. Thanks, Pär, Sweden