sesty Posted May 30, 2023 Share Posted May 30, 2023 Took the bike out of winter storage this weekend, gave it a wash and a rip around the area. Half way home, starting off on a green light, hit 3rd gear and it the engine would not rev passed 6k and sounded like it was running on one cylinder. On light throttle pulls it was very sluggish until it got a certain RPM or throttle position and the bike would have full power out of nowhere. Rev up to around 6k and fall flat again. Felt like i was driving my old XS400 with a clogged pilot jet. Made for an interesting drive home. Right side cylinder was about 25 degrees cooler than the left when i got home. I was hoping it was just old gas, but after draining the tank and topping up with fresh gas it still have the same symptoms. Very low mile bike under 3k - will be taking a look at the plugs and intake when I can, anything else I should look at? Link to comment Share on other sites More sharing options...
M. Hausknecht Posted May 30, 2023 Share Posted May 30, 2023 Sounds like a spark issue. Once, when I changed my plugs, I wasn't conscientious enough to assure both coils were fully engaged on their plugs. The result was as you describe. The cooler pipe is consistent with that one cylinder working only intermittently. Also make sure the connectors to your injectors are secure. 1 Link to comment Share on other sites More sharing options...
robbo10 Posted May 30, 2023 Share Posted May 30, 2023 I had a similar problem on another bike. Turned out it was an electrical problem with a connector somewhere. (someone else took a long time to find it). That said, I do not want to lead you astray..... Just do it! Link to comment Share on other sites More sharing options...
Lone Wolf Posted May 30, 2023 Share Posted May 30, 2023 2 hours ago, M. Hausknecht said: Sounds like a spark issue. Agreed - easy to verify with spark tester. Harbor Freight has one for $5 I like to do that before throwing parts at an engine, to focus the diagnostic. 1 Link to comment Share on other sites More sharing options...
sesty Posted May 30, 2023 Author Share Posted May 30, 2023 22 minutes ago, Lone Wolf said: Agreed - easy to verify with spark tester. Harbor Freight has one for $5 I like to do that before throwing parts at an engine, to focus the diagnostic. assume this tool would only show if the coil was bad, not the plug, right? Link to comment Share on other sites More sharing options...
M. Hausknecht Posted May 30, 2023 Share Posted May 30, 2023 31 minutes ago, sesty said: assume this tool would only show if the coil was bad, not the plug, right? Correct (coil or something else before reaching the plug), but since plugs don't go bad unless fouled or physically damaged (both of which are evident when you remove and look at the plug), the tester is ok. I'm old school though; just ground the plug on something when connected to the coil,and thumb the starter. You get a good juicy spark or not. 1 Link to comment Share on other sites More sharing options...
sesty Posted May 31, 2023 Author Share Posted May 31, 2023 hoping to have time this weekend to take a look Link to comment Share on other sites More sharing options...
Anaya Posted June 27, 2023 Share Posted June 27, 2023 Hi I’m having a similar issue one cylinder will shut off intermittently, did you resolve this? Link to comment Share on other sites More sharing options...
sesty Posted August 15, 2023 Author Share Posted August 15, 2023 (edited) On 6/26/2023 at 11:19 PM, Anaya said: Hi I’m having a similar issue one cylinder will shut off intermittently, did you resolve this? Just got to it last weekend.. got the plastic and tank off and realized I didn’t have a 14 spark plug socket. Amazons bringing one this week. got the coils out but the leads on my Klein multimeter are not long enough to test the resistance on the second circuit or bottom connector. Shoved the lead as far at it will go into the bottom and still registering as open. May just buy the spark tester above Edited August 15, 2023 by sesty Link to comment Share on other sites More sharing options...
Triple Jim Posted August 16, 2023 Share Posted August 16, 2023 21 hours ago, sesty said: Shoved the lead as far at it will go into the bottom and still registering as open. How about using a piece of wire as an extension? Link to comment Share on other sites More sharing options...
sesty Posted August 28, 2023 Author Share Posted August 28, 2023 should have just checked the manual, the bottom caps of the coils just pop off... Both coils primary and secondary within spec... hoping to get to swapping the plugs this weekend - and while i have everything off might be worth taking a look at the fuel pump pick up screen / fuel pump then i guess i am only left looking at the injectors? Link to comment Share on other sites More sharing options...
Triple Jim Posted August 28, 2023 Share Posted August 28, 2023 30 minutes ago, sesty said: then i guess i am only left looking at the injectors? Once you have determined that you have spark to both cylinders you can move on to fuel problems. 2 Link to comment Share on other sites More sharing options...
Global Moderator Pursuvant Posted August 29, 2023 Global Moderator Share Posted August 29, 2023 10 hours ago, sesty said: ....might be worth taking a look at the fuel pump pick up screen / fuel pump... Here's my experience with failing fuel pump. Also explains how to get to the filter, clogged or not. That said, I can't see a fuel pump clogging filter or failing pump as a likely cause for the same single cylinder firing/no-fire. Link to comment Share on other sites More sharing options...
Paulb5950 Posted September 7, 2023 Share Posted September 7, 2023 Curious if you figured out what the issue was for this? Link to comment Share on other sites More sharing options...
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