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Use 10w40 motor oil in the gear box. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell. Change the oil filter along with the oil.
Pull out the slide then lower the clip on the jet needle one notch. Then try two notches. This will richen the mid range response. Give this a try before trashing the carbs.
Go to the site below and you can download a free service manual PDF. The one you want is 47th from the top of the Suzuki list. Yes, I know that it is for '93 to '95 models. It is the closest I could come to '89 and 90% of the data doesn't change and it is free. For an exact match Google " service manuals suzuki " or go to www.repairmanuals.com Also try your local library. Often guys will donate manuals to the library.
The oil can be drained removing the NEAS system valves ( 2 allen bolts ).
System contains 456 cc ( 15.4oz.) oil in each leg.
the oil-level measured from the top of the COMPRESSED leg is 107mm.
- have an oil-suction pump
- Make a tube with a stopper at 130mmfrom the end.
Drill a little hole ( 3mm ) at 107mm (4.21in) of the stopper.
More oil will tighten the suspension, less will soften it a bit.
Oil type: SAE15