When i engage the first gear there is a grinding sound and clacking sound...shifting through other gears seems effortless...am i not working the clutch properly...is it slipping...is it a bad gear maybe?
also...after riding for a while the rpms will hold steady at 3000 after i let go of the throttle...it will hover for a few seconds the slowly back back own to either 1500 which is where it should be...or it will hold at 2000 and if i let the clutch out a little it will drop back to idle...any ideas felllas?
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Re: cluch slipping
The first problem may be a slightly bent shift fork but you'd probably have to pull it apart to find out for sure. Alot of these older yammies hate old oil. Try putting some fresh oil in and see what happens.
Your second problem sounds like you have a slightly lean idle. You may want to try adjusting your idle mix screws a little bit but only adjust them in 1/8 turn increments and let the bike run for at least 30 seconds between adjustments to allow the mix time to right itself.,,
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I suspect that it will be in the shift mechanism
If it is a cable shift then replace the cable
If it levers or other linkages check and adjust or lubricate as required
I doubt it is in the clutch as you haven't mentioned difficulty in selecting first gear only shifting from 1 to 2nd.
If the transmission oil is full and the clutch master cylinder is full, feels normal and does not slip going up steep grades, likely the gears in the transmission are worn (usually synchros). All items above contribute to proper shift engagement.
While sitting still the gears are not moving. This sounds like a slightly bent shift fork. In the diagram below the slider gear moves left and right to engage the gears. The gear "dogs" fit into holes cast into the stationary gears. The grinding takes place as the fork moves the slider into first gear but the dogs are not getting moved the full distance needed to fully engage the gear because of the bent fork. The center case must be split to gain access to the gears and shift forks.
If you are hearing a bad grinding noise then Stop riding the bike NOW. If you continue to ride, or run the engine, you will only do more internal damage and make the repair cost higher. Chances are you have a bent shift fork and the noise is the engaging dogs on the slider gear grinding the side of a fixed gear because the bent fork is preventing full engagement.
The entire engine comes out of the frame and gets completely torn down. The top end comes off, the case covers come off, the clutch, shift shaft, kick starter, flywheel and electrics all come off. Then the case is split to gain access to the gears and shift drum. The gears and shift drum now get removed and now the fork can be replaced. If a gear needs to be replaced because of a broken teeth, replace also any gear the teeth mesh with. A few special tools are needed. Sorry for having to give you the bad news.
I will bet it grinds when you try to engage first or reverse. When this happened on my car, I adjusted the clutch and it improved. You need about a half inch of free play when you first touch the pedal with your foot. If you have a slave cylinder, (hydraulic clutch). You may need to bleed the system. With air in the system, you can't get enough clutch to fully disengage the trans from the motor.(Clutch and pressure plate) It's like you only pushed down half way on the pedal. If it's not hydraulic, it should be adjusted with wrenches. If clutch is fine, It could be a loose shift linkage. It would seem extra sloppy when moving shifter, It would just not go in gear, with out the grinding.Hope this helps. lbreen
You are likely correct...sounds like the synchro is shot or the shift fork is somewhat worn. Is fluid full? As long as the clutch does not slip and is engaging and disengaging somewhere in the center to just below center of travel, it's OK.