What can the problem be when my bike does not want to accelerate in 1st and 2nd gear and how can I fix it. Its a suzuki rm85 2008 model

SOURCE: bogs down at 25 30 mph 1st gear 45 in 2nd gear

• Check to see that the choke is not partially on.
• Drain the carbs and clean them with B12 chemtool or any other good carb cleaner. The main jets in the carbs are probably gummed up. To clean the carbs properly they will need to be removed from the bike. Be sure to balance and synchronize the carbs when reinstalling.
• Remove and clean the petcock water trap and clean the trap of water and rust etc. If a filter screen is present clean it as well.
• Set idle speed to factory specs. Do not use gas with Ethanol.

SOURCE: kawasaki gpz 1000 rx 1987 model

Running well at high revs would indicate that all the fuel and air it needs are getting to the engine and you also have a good spark. Probably no problem with air and fuel filter ( if fitted) or sparkplugs.

Running hot, and bad idling are signs of a lean air fuel mixture. The engine is probably not getting enough fuel at low revs.

This could be caused by an air leak between the carburettors and the engine. Check that the vacuum line to the fuel tap is properly secured at both ends. It is behind the fuel line at the tap.

Get a a short length of hollow plastic tube and use it like a stethascope - put one end to your ear and move the other end around your carburettor mounts with your engine revs as low as you can get, and listen for any sucking noises that would indicate a leak. Look for cracks in the rubber inlets.

The other possibility is that there is an internal blockage in the idling jets or idling fuel circuit. This is where dirt tends to lodge because the jet dimensions and passageways are very fine - The high speed jets are much bigger and dirt often just passes straight through.

Try a little bit of choke while the engine is warm to see if you get a stronger low speed response. If so that would point to an internal blockage.

SOURCE: Bike turns off when I put in 1st or 2nd gear

First replace the clutch,clutch basket,and throw out bearing that has been destroyed,check the cable for damage and if you still have the same problem,Then check the kick stand switch.

SOURCE: 2003 SUZUKI GSXR 600 SHIFTING QUESTION

Nothing to fear. The shift forks ride on a long spiral grooved drum which has some inertia. If you stomp the gear, sometimes the inertia will carry the shift fork beyond it's intended destination. The various gears are constant mesh with it's mating gear, but are not coupled to it's shaft. The gear, when selected, carries a fixed 'dog' that couples to a sliding 'dog' which is controlled by the appropriate shift fork and is splined to the shaft the gear is riding on. These 'dogs' are like fingers which stick out on the sides of gears and sliders. The reason you have to rock the bike is because the 'dogs' are fairly coarse and don't instantly fit together except when the bike is in motion.

SOURCE: Pops out of 1st gear under acceleration.

Hi Buddy
There is not an easy solution to your gearbox problem,it is general wear on the 'dogs' or 'shift drum'..The only other thing it could be is wear on the 'external shift mechanism'.
I,ve just rebuilt a 1996 vn1500 classic whitch had the same problem so if you need any advise or step by step photos please email me at '[email protected]'
paul