Please help bike wont run cold
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Junior Member
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Please help bike wont run cold
Aright I'm real new to the streetbike thing but, I'll keep this brief, i bought a 06 cbr600f4i that wouldnt run, would crank but didnt run, the guy had crashed the thing and itd been sitting for a while, well after taking it to my local motorcycle shop and putting $700 into it there he got it running after replacing the fuel pump assembly, now it runs, but only when warmed up, takes forever to start cold and idles at like 500rpm's until warmed up somewhat, it also has pretty poor throttle response and takes a while when riding to get up to speed. When it's warm on a sunny day it'll run with ALMOST no issue. Anyone please help its almost riding weather and i wanna ride. I've checked the pressure regulator and no gas came out the vacuum line, shes also got new spark plugs (NGK). Like i said once warmed up she'll run fine, idles at 1400rpms and has OK throttle response.
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Junior Member
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Im leaning more towards this wax unit being the issue, I do need to find this little box and determine whether its toast or not. Anyone have a link to a replacement?
Administrator and MVN, March 2012/Oct 2013 ROTM
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From: socal 949/951
The wax unit is on the throttle bodies, it has coolant hoses on it.
Your bike linkage should be set to have a fast idle, like 3k, all the time. The coolant heats up the wax and the linkage gets pulled down to warm base idle, about 1200. If the unit is stuck in warm position, the cold engine will have trouble maintaining rpms.
Your bike linkage should be set to have a fast idle, like 3k, all the time. The coolant heats up the wax and the linkage gets pulled down to warm base idle, about 1200. If the unit is stuck in warm position, the cold engine will have trouble maintaining rpms.
Thread Starter
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Junior Member
Joined: Feb 2017
Posts: 6
Likes: 0
The wax unit is on the throttle bodies, it has coolant hoses on it.
Your bike linkage should be set to have a fast idle, like 3k, all the time. The coolant heats up the wax and the linkage gets pulled down to warm base idle, about 1200. If the unit is stuck in warm position, the cold engine will have trouble maintaining rpms.
Your bike linkage should be set to have a fast idle, like 3k, all the time. The coolant heats up the wax and the linkage gets pulled down to warm base idle, about 1200. If the unit is stuck in warm position, the cold engine will have trouble maintaining rpms.
Administrator and MVN, March 2012/Oct 2013 ROTM
Joined: Sep 2011
Posts: 12,193
Likes: 119
From: socal 949/951
Not really a common thing. Usually the problem is a high or surging idle that's caused by low coolant or a blocked coolant line. If the air got hot enough to be an issue, your bike would be the least of your problems.