I just bought a 2003 suzuki intruder 1500. The bike idles well when it is cold but, after 5 miles of riding the idle is high when stopped at a redlight. If i put it in gear and release the clutch slightly...
(Manual Choke)
Make sure that when the choke plunger is fully pushed IN
(e.g. choke off) - that the choke cable is actually slack, if it is still tight then adjust the cable till there is a little bit of slack with the plunger pushed in.
(Auto Choke)Have you tried blipping the throttle, just give it a guick stab when it's warmed up and running, be quite sharp and deliberate with the throttle, this usually cancels auto-choke if it's working properly.
if not...
try setting the idle screw on the throttle body when the engine is hot, unscrew the screw to get the desired idle speed, then let it cool (fully cool) and see if it still starts and warms up ok with the new lower setting, either problem solved or back to square 1.. (reset the idle screw back to original setting, good idea to make a note of how far you unscrewed the screw in the first place :-)
check the accelerator cable(s) are not too tight, could be holding the throttle open slightly.
check the air filter/box to see if it is clogged... clogged filter=rich mixture...
Have the engine temp/air temp/oxygen sensors (if applicable) checked out at a garage, they could be causing problems also, but are £20-60 each, if one is faulty dont get bummed for labor charges, a temp sender is a bolt with a connector on it, fit with a ring spanner in 15 seconds, just get the garage to show you which one is broken first
(just so you know ;-) then when they "offer to fit it for you" just ask for the part and fit it yourself - turns a £100 job into £20-60 job.
let me know how you get on.
(The Engine Guy)
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Just check through everything in roughly this order,
starting with "free" "easy" and moving onto
"£20 - £60" - "annoying and niggly" - hopefully you get if fixed near the top of the list!
thinking... this is a great thumping engine - Are you using the correct grade fuel, try premium (97RON or better) if you've been on regular (95RON), some engines just don't like weak fuel especially big bike and performance car engines.
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