gaz2909 Posted October 4, 2008 Share Posted October 4, 2008 Hi I have just put a 1989 XJ600 back on the road after it has been standing for a number of years, I have got it running ok and it accelerates fine up to about 50 to 60 MPH and then it seems reluctant to go any faster does anyone out there recognise the symptoms if so any help would be gratfully accepted Thanks Gary Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 4, 2008 Moderator Share Posted October 4, 2008 Hi I have just put a 1989 XJ600 back on the road after it has been standing for a number of years, I have got it running ok and it accelerates fine up to about 50 to 60 MPH and then it seems reluctant to go any faster does anyone out there recognise the symptoms if so any help would be gratfully accepted Thanks Gary Check the fuel filter and if it has a breather pipe on the tank, check it isnt trapped or kinked Link to comment Share on other sites More sharing options...
JimR Posted October 4, 2008 Share Posted October 4, 2008 Check the fuel filter and if it has a breather pipe on the tank, check it isnt trapped or kinked That modal didn't have an inline fuel filter (only the gauze in the tank) nor breather pipe ( as such just a tube from the venting filler cap that ran to the back of the tank.) the rubber tube may be blocked but with a venting fuel cap I guess that would not make that much difference (unless the cap vent is blocked). Perhaps we need to know on the engines state of health is the compression ok, engines left for years in one position can end up with valve seats that are rusted (lack of compression on the affected cylinders). Do we know wether the bike pulls well to 55 then stops going or is it a struggle to get the bike to that speed. Has the motor had a setup service (carb clean, wire check and compression test) until that is known it's difficult to work out ... my gut feeling is with the carbs, when M/C sales slumped in the early/middle 80's there were quit a few XJ550's (same motor just smaller bores) that were left in their crates to long and ended up with the symtoms suplied we need more input from Gaz as to the state of play with the bike Regards Jim Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 4, 2008 Moderator Share Posted October 4, 2008 That modal didn't have an inline fuel filter I didnt say it did, but the gauze in the tank is a 'filter' and on a bike thats nigh on twenty years old and also been standing and showing these symptoms, its where i'd go first Do we know wether the bike pulls well to 55 then stops going or is it a struggle to get the bike to that speed. Yes as gaz said, it accelerates fine to 50 - 60 Link to comment Share on other sites More sharing options...
gaz2909 Posted October 5, 2008 Author Share Posted October 5, 2008 Thanks for all that but the carbs have been off, cleaned and re balanced it does accelerate fine up to about 50 and then moves up slowly to approx 60 and then will not go any faster it feels like it wants to but seems to cut in and out if I slow down it will again ride fine up to 50 acceleration is good I was wondering if it could be something like the coil breaking down under load? but I know a lot more about car engines than I do bikes. Compression test all seems in order. Gary Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 5, 2008 Moderator Share Posted October 5, 2008 Yes could be the coils breaking down, could also be the pickup coils breaking down for the electronic ignition, But as i say make sure you have a good unrestricted fuel supply Link to comment Share on other sites More sharing options...
McBiker Posted October 20, 2008 Share Posted October 20, 2008 It wants a retirement plan Link to comment Share on other sites More sharing options...
gameplayerltd Posted October 26, 2008 Share Posted October 26, 2008 Thanks for all that but the carbs have been off, cleaned and re balanced it does accelerate fine up to about 50 and then moves up slowly to approx 60 and then will not go any faster it feels like it wants to but seems to cut in and out if I slow down it will again ride fine up to 50 acceleration is good I was wondering if it could be something like the coil breaking down under load? but I know a lot more about car engines than I do bikes. Compression test all seems in order. Gary perhaps its restricted? Link to comment Share on other sites More sharing options...
steveralls Posted November 7, 2008 Share Posted November 7, 2008 Have you tried new plugs & caps ? Link to comment Share on other sites More sharing options...
Moderator Cynic Posted November 7, 2008 Moderator Share Posted November 7, 2008 Thanks for all that but the carbs have been off, cleaned and re balanced it does accelerate fine up to about 50 and then moves up slowly to approx 60 and then will not go any faster it feels like it wants to but seems to cut in and out if I slow down it will again ride fine up to 50 acceleration is good I was wondering if it could be something like the coil breaking down under load? but I know a lot more about car engines than I do bikes. Compression test all seems in order. Gary They are pretty much the same as far as diagnosing the route cause of problems, the soloutions may be different due to part variations and layout. If you have reasonable mechanical knowledge and your gut is saying coils, have a look. Link to comment Share on other sites More sharing options...
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