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Posted by shunter v8
- April 14, 2015, 15:59:38 PMYes only second gear. That's what I find so strange about it.
Posted by Troll
- April 14, 2015, 15:44:16 PMThis is ONLY in 2nd gear? Very strange...
Posted by shunter v8
- April 14, 2015, 14:07:52 PMOkay latest update,I had two of these light up spark plug caps so I changed them for two NGK ones I had in the garage and took it a spin. Unfortunately it's exactly the same I will try and explain the symptoms better. I got the bike warmed up and did a standing start,first gear under hard acceleration no problem,second gear starts pulling then it's like hitting a very bad flat spot then getting full power back and then it does the same again almost straight away we are still in second gear,third,fourth and fifth gear all fine under hard acceleration. It has vance and Hines on it which I thought may have been the culprit,I had to get the bike government tested when I bought it and I had to put an original exhaust on it then and it was still the same.
Posted by shunter v8
- April 14, 2015, 08:58:36 AMok thanks, i will start with plug caps then. The surge is quite dramatic like bike is being tied to a post and you are giving it throttle to try and go and then someone cuts the rope. it really is quite scary epecially 2 up.
Posted by Troll
- April 14, 2015, 08:46:02 AMQuote from: shunter v8 on April 14, 2015, 06:53:25 AMThanks all for your input. To start with the bike had new plugs filters etc about 2.5k miles ago, the bike came with plug caps that light up when the engine is running, i dont know if they are a possible cause of the fault, what suprises me it is only in 2nd gear and under hard acceleration. Greenbarn my definition of surging is it starts pulling smoothly but very quickly the power comes in with a bang and it does this twice while in second gear, i suppose to put it another way it feels like a blocked jet has just cleared its self and you are getting a rush of petrol through. Thanks for all your help.
I don't know how they are where you live, but those light up plug caps cause a world of problems here, in the States. JUNK...not meant for anything but show and trailer queens! I know what Greenbarn is getting at about a symptom description...A surge is like sitting in a rocking chair....back and forth, back and forth, or perhaps the feeling you get when riding into a headwind.
Posted by John Hopkins
- April 14, 2015, 07:53:06 AMAnother thought is that you could drain a pint of gas to check there isn't water in it.
John.
Posted by shunter v8
- April 14, 2015, 06:53:25 AMThanks all for your input. To start with the bike had new plugs filters etc about 2.5k miles ago, the bike came with plug caps that light up when the engine is running, i dont know if they are a possible cause of the fault, what suprises me it is only in 2nd gear and under hard acceleration. Greenbarn my definition of surging is it starts pulling smoothly but very quickly the power comes in with a bang and it does this twice while in second gear, i suppose to put it another way it feels like a blocked jet has just cleared its self and you are getting a rush of petrol through. Thanks for all your help.
Posted by greenbarn
- April 13, 2015, 22:18:04 PMShunter, what exactly to you mean by "surging"- I've had different people mean different things from using that word.
Posted by Troll
- April 13, 2015, 18:23:59 PMI don't think it's an injector, since the fuel pressure goes up under a heavy load, due to the fuel pressure regulator. I would be more concerned about ignition issues. How old are the plugs? Is this more noticeable on a damp day? Heavy loads and worn spark plugs will make a miss fire that can really feel interesting. Since the 1500 has dual plugs, each fired by a separate coil, one of the plugs miss firing could give you this feeling. Damp days and 15 year old plug wires don't mix well. Possible one or more wires is leaking to ground. Again, a heavy load will reveal this problem. The fact that there is no issue when operating at reduced load indicates an ign. problem.
Posted by John Hopkins
- April 13, 2015, 17:58:44 PMIt sounds like a blocked injector.
John.
Posted by shunter v8
- April 13, 2015, 17:32:15 PMI have a strange fault on my 1500 drifter and just wondered if anyone else had experienced it. The fault is under hard acceleration and only in second gear the engine suddenly surges starts pulling then surges again, it is quite unnerving especially if you have a pillion. During normal riding it behaves as it should,just under fairly hard acceleration. Any suggestions would be most appreciated.