Im having problems it is bogging out top end.
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| 1980cr 250 bogging out top end https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=725 |
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| Author: | jd77803 [ Sun Jul 24, 2005 4:39 pm ] |
| Post subject: | 1980cr 250 bogging out top end |
Im having problems it is bogging out top end.
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| Author: | original dirt [ Mon Jul 25, 2005 7:44 am ] |
| Post subject: | Cr in the bogs !! |
Is this a "new" problem, or one with no history as far as you are concerned. Also, what is the throttle position when this occurs? 1/4?, 1/2?, 3/4?, WFO???? Need mo info to help. OD |
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| Author: | jd77803 [ Mon Jul 25, 2005 8:34 pm ] |
| Post subject: | |
I bought the bike 10-04 . it has new piston, reeds, reeds insulator,rebuilt carb, It bogs out 1/2 to wfo. check for air leaks found none. I am thinking of new carb might solve this? |
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| Author: | ricortes [ Mon Jul 25, 2005 11:36 pm ] |
| Post subject: | |
Try running it with the choke on. If it runs worse, the needle is having problems like not being seated by the spring. Could even be something like the main jet vibrated loose/off. If it runs better, the main jet is plugged. |
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| Author: | jd77803 [ Tue Jul 26, 2005 8:31 am ] |
| Post subject: | cr bogs |
I have tryed new jets I have tryed going down and up it did not change . |
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| Author: | VintageDave [ Wed Jul 27, 2005 6:32 pm ] |
| Post subject: | |
Have you done a leakdown test to see if the crank seals are good? What is the compression psi? Have you checked for good connections at the coil, frame, engine, cdi and a clean flywheel? Have you disconnected the kill button? Have you pulled the choke out of the carb to see if the rubber on the plunger is still good and pliable? All of those items should be done before you bother trying to jet it. An air leak or bad electrical will ruin your attempts to jet it. |
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| Author: | original dirt [ Thu Jul 28, 2005 2:40 pm ] |
| Post subject: | |
Usually, the symptoms you describe can be attributed to two areas. Worn piston rings/excessive cylinder to piston clearance, or leaking crankshaft seals which would add another set of symptoms. Namely, increase smoke in the exhaust accompanied by a decrease in trans oil level and increased fouled spark plugs would indicate a leaking clutch side cank seal. Variable idle speed and slow rev-down along with unexplained dampness in the lower magneto area would indicate a leaking dry - side seal. Also easily checked by holding the mag flywheel in your hand and trying to detect movement in any direction but circular. Any detectable 'clic' of movement indicates bad crank bearings too. OD |
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| Author: | ricortes [ Fri Jul 29, 2005 11:17 am ] |
| Post subject: | |
original dirt wrote: Usually, the symptoms you describe can be attributed to two areas. Worn piston rings/excessive cylinder to piston clearance, or leaking crankshaft seals which would add another set of symptoms. Namely, increase smoke in the exhaust accompanied by a decrease in trans oil level and increased fouled spark plugs would indicate a leaking clutch side cank seal. Variable idle speed and slow rev-down along with unexplained dampness in the lower magneto area would indicate a leaking dry - side seal. Also easily checked by holding the mag flywheel in your hand and trying to detect movement in any direction but circular. Any detectable 'clic' of movement indicates bad crank bearings too.
OD True those will make for a bad top end but the bottom will be even worse. He says the bottom is still strong. I've worked on several engines with those problems and most of them had melted from apparently running WOT to get forward locomotion with an absent bottom end. |
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| Author: | jd77803 [ Tue Oct 18, 2005 8:10 pm ] |
| Post subject: | |
put new carb runs like champ |
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