Why won't my oil drain plug screw back in on my 1990 Suzuki GSXR 1100?

beside the baterry

Drain it out ( at the bottom a bit to left an a side screw), change oil filter, screw back oil drain plug, put the fresh oil ca. 3,9L . Check on oil plug plastic lever.

Your shifter cam bolt has backed out, this is a common problem on earlier GSXR's. Happened twice on my 2000, both times during race weekends.

Stop riding the bike and shifting at all and do the following repair:

Remove clutch cover - you'll drain some oil so make sure you have a drip pan underneath

Remove the 5 the clutch housing plate bolts - careful as they have pretty stiff springs behind them providing torsion

Remove all the clutch plates - make sure you keep the same order and re-install the same way; matter of fact if you have never replaced your clutch plates, do it along with this repair.

Once the clutch case is basically empty, you will see at the lower left a small assembly that looks a bit like a tuning fork, at the end of the shifter shaft. There is also a cam there with rounded cogs. There is a 8mm or 10 mm hex head bolt that holds this cam, and I'm sure it has backed out and is causing the cam and shifter to not engage the gears properly.

Remove the cam bolt. Spray some compressed air or even a light spray of brake cleaner in the threaded area where the bolt you just removed is. Make sure the threads are clean and dry.

Place the cam bolt and assembly back in its position, and take some RED loctite to the shifter cam bolt threads. Make sure to torque the bolt to specifications, I think it's 24 or 28 nm.

Let the bolt set for 24-8 hours, then reassemble the clutch and replace the clutch cover gasket. Top off the oil and go riding.

put oil catch pan under bike loosen drain bolt at the bottom of the engine always located at the lowest point when on kickstand. And then take drain fill cap off let fully drain...take off filter..I"ve never had a problem getting them off, but if you do, you'll need a filter wrench to loosen it. Now after its drained, reinstall drain bolt, torque down good and snug... if filter comes with new drain plug washer use new one...now take some clean 10w40 motorcycle oil and wet your finger and lube the filter gasket, this always helps when it come time to remove it.. and hand tightenen as tight as you can get it. Now most all bikes take around 3 qts, pour in 2 and 1/2 quartsm right away, and then start the bike for about 30 seconds, and let the oil get into the filter, turn off and let settle a bit check dip stick by only dropping it in with the bike upright. Then proceed to add oil only to about 3/4 from full..this will insure that you dont overfill...you never want to overfill. It could ruin the engine. Now stick the cap back on and take it for a test drive and get the oil hot,..turn off bike, hold it upright, and check level one more time... and top off if you choose, older bikes should ALWAYS stick with 10w40 and nothing else, dont put in any additives or synthetics this could cause clutch plate slippage. oh and i forgot you will probably have to take off one of your side covers to get to the oil filter and maybe even the drain plug.

the gsxr1100 cam will fit the bandit 1200 engine, i've done that mod 3 times so far. after that it's just exhaust and jetting.

Short answer no, it is most likely running too rich & will need to pull the carbs & replace the oversize jets with, either the factory jets or smaller ones.

The drain plug will be either 14mm, 17mm, or 19mm. Probably a 17mm. Go to this site and you can download a free PDF service manual. The manual will help you on more than just oil changes. www.carlsalter.com/motorcycle-manuals.asp Most of the manuals are in English but some are not. There is no way to be sure without doing the download. You can always delete it if in a foreign language. There is a GXSR1100 that will use the same oil as the GSX1100. Most of the two engines are identical. A “very helpful” rating for this answer? Thanks!

No They are Different They Wont fit..

same motor just different power outputs