| Vintage Dirt Bike Q & A https://vintagedirtbikeforums.alp-sys.com/ |
|
| CR480 running rough https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=2125 |
Page 1 of 1 |
| Author: | yodadada [ Sun Jan 04, 2009 11:29 pm ] |
| Post subject: | CR480 running rough |
I picked up another 83 CR480 and it started just fine but ran rough. I replaced the carb with one I intend to use on the CR I'm rebuilding and it still runs rough. It will idle without the choke on but it seems to kind of sputter when I roll the thottle on. It did exactly the same thing with the other carb. Both carbs have stock jetting and I adjusted the air screw 1 1/2 turns out. Any suggestions on what I might look at next to resolve the problem? Thanks for the help, Jim |
|
| Author: | badsix [ Mon Jan 05, 2009 7:15 am ] |
| Post subject: | Re: CR480 running rough |
mine had bad crank seals is it smoking more than normal or can you smell gear oil in the exh. |
|
| Author: | redrocket190 [ Mon Jan 05, 2009 5:52 pm ] |
| Post subject: | Re: CR480 running rough |
Three obvious variables.... 1. Jetting. Stock CR480R jetting is rich. You need 152-ish main and a 70 pilot. Plus raise the clip on the needle. 2. The carb is worn. Eliminated if it is new and/or works fine on another bike. (I think you are OK on this one.) 3. Primary drive crank seal is worn. Transmission oil will make exhaust smoke. |
|
| Page 1 of 1 | All times are UTC - 7 hours [ DST ] |
| Powered by phpBB® Forum Software © phpBB Group https://www.phpbb.com/ |
|