Cold Weather Engine Issues
01-24-2011, 03:14 PM
#1
Cold Weather Engine Issues
What would cause an engine to go out of tune even though I just ran it in the cold the other day(probably the same temps). It will start fine but it runs raggedy then cuts off after WOT...I have adjusted the carb (668) as much as was reasonable but it only ran a little better with it rich but it still cut off soon after WOT. Any ideas?? BTW, this engine hasn't had no more than 20 tanks in it and was running great two days ago.
TIA
TIA
01-24-2011, 03:25 PM
#2
RE: Cold Weather Engine Issues
Maybe any leaks all of a sudden? Have you checked the carb gaskets when the engine is running to see if it draws false air from somewhere around between the carb and the engine? Also check the throttle valve shaft for wear and/or leaks by using start gas or WD-40 or similar. Be careful not to spray it directly on the filter as this will give you a "false reading".
01-25-2011, 06:18 AM
#4
RE: Cold Weather Engine Issues
After running my baja last year on a frozen lake in -9 temps for about a tank of fuel,
it started to run as you say your is doing now, tried tunning it and then changed the carb which made no difference,
it would run but when it got to half throttle it would splutter and have a hard time idleing,
i found it to be a headgasket on the way out, it wasn`t blown it just had a damp showing at the spurgear side,
changed the gasket and it now runs perfect.
it started to run as you say your is doing now, tried tunning it and then changed the carb which made no difference,
it would run but when it got to half throttle it would splutter and have a hard time idleing,
i found it to be a headgasket on the way out, it wasn`t blown it just had a damp showing at the spurgear side,
changed the gasket and it now runs perfect.
01-25-2011, 01:07 PM
#6
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RE: Cold Weather Engine Issues
had the same issue yesterday. but i didn't think anything about it. because it did the same thing last year and ran perfect during the summer. guess what? any guesses what i just found?
01-25-2011, 03:30 PM
#8
Senior Member
RE: Cold Weather Engine Issues
ORIGINAL: bbuzzard
What would cause an engine to go out of tune even though I just ran it in the cold the other day(probably the same temps). It will start fine but it runs raggedy then cuts off after WOT...I have adjusted the carb (668) as much as was reasonable but it only ran a little better with it rich but it still cut off soon after WOT. Any ideas?? BTW, this engine hasn't had no more than 20 tanks in it and was running great two days ago.
TIA
What would cause an engine to go out of tune even though I just ran it in the cold the other day(probably the same temps). It will start fine but it runs raggedy then cuts off after WOT...I have adjusted the carb (668) as much as was reasonable but it only ran a little better with it rich but it still cut off soon after WOT. Any ideas?? BTW, this engine hasn't had no more than 20 tanks in it and was running great two days ago.
TIA
01-25-2011, 03:46 PM
#9
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RE: Cold Weather Engine Issues
a leak at the head gasket. i torqued the head bolts. but i think that's only going to get me so far. wish i had the money to convert to four bolt.
01-30-2011, 06:36 PM
#11
RE: Cold Weather Engine Issues
I'm not real sure what the issue was but I had a ported headkit to go on that GP290 and all is good once I did the upgrade. There were no leaks that I could tell, everything was tight. The top of the piston exhibited black tarring but that probably was due to my issues with the carb (I ran it rich for a long time) or it may have been the plug but that wasn't oily at all, just dark.I will attest to this headkit though (DDM port job) it is definitely a monster!!
I appreciate all the input!
Thanks
b
I appreciate all the input!
Thanks
b
