Question about 1990 Yamaha FZR 600

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How do i set the timing on a 1990 yamaha FZR600 . the bike idles fine but when i start to move in first gear it feels like its ggetting too much gas. pleas help

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  • 43,668 Answers

Hi, Www_jimmystr and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Inlet system air leak.
4. Vacuum piston malfunction.
5. Accelerator pump leaking or no output.
6. Plugged bowl vent.
7. Fuel level in bowl too low.
8. Restricted fuel supply passages.
9. Plugged jets or passages.
10. Worn or damaged needle or needle jet.
12. The enricher valve not seated or leaking.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
SOHC 4 Owners Club Forums
Bogs down at throttle and backfires like war The FZR Forum
1985 Yamaha IT200N Parts

Posted on Apr 02, 2016


6 Suggested Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: v-star 1100 custom stalls when dropped into 1st gear

did u make sure the kickstand was up

Posted on Apr 12, 2009

  • 12 Answers

SOURCE: Yamaha 06' V-star 650 idle prolbem!

Fuel filter is located near the fuel shutoff valve within three inches. It is inline between the shutoff valve and the fuel pump (towards tank).

The fuel circuit is: Tank/Fuel Pump/Fuel Filter/Fuel Shut-off Valve/Carbs.

You first step is to check for fuel delivery to the filter. Make sure the bike is cool and no iginition sources are nearby. Disconnect the inlet line at the filter and turn key on and crank engine (to trigger fuel pump.) Do not try and start at this time (choke off).

If fuel is adequate to the filter, check the filter by blowing through it, it should easily pass air. Replace filter if questionable.

Next reconnect the fuel lines and remove float bowl drain plugs in the back of the carbs (2 per carb). If with key on and cranking fuel pours out of these ports then you probably have clogged fuel jets. If not then the float bowl needles / pipes could be plugged with varnish from dried fuel. You can try spraying carb cleaner into the fuel inlet to clear the varnish and then retest. Careful not to spray carb cleaner on yourself (wrap straw with a rag).

If you have good fuel flow to the carbs and bowls you probably have varnish plugging the jets. You should remove the carbs and clean them thoroughly.

Hope this helps,


Posted on May 18, 2009

  • 8 Answers

SOURCE: yamaha fzr 1000 exup 1990, bike's been standing

this happens after they sit a while, get her started, get her rolling, put her in second gear, hold the clutch in, get her up to 20 miles an hour, hold a little throttle on and slam on the rear brake, this usually will free up the stuck friction plates. If not try it a couple of times, it has always worked for me, also if that does not work for you you have to take the side cover off of the engine (clutch side) and using a flat headed screwdriver, and a zip tie to hold the clutch lever back to the handle bar, place the screwdriver in between the clutch plates and gently pry them apart from each other, on your bike I believe you have 7 friction plates and 6 steel plates. ( if you have to remove the cover go get a gasket first).

Posted on Jul 05, 2009

  • 1 Answer

SOURCE: Yamaha TTR 125 L won't idle

The problem is that your idle is adjusted to low just like mine, you need to adjust your idle

Posted on Aug 04, 2009

  • 56 Answers

SOURCE: Yamaha FZR600 1991 - Spark plugs fire but bike doesn't start

Question . when you say the spark plugs fired , do you mean that you took them out to check ?? or do you mean that you heard the engine crank over.Either way if your fuel tap is faulty,you have more than likely dumped a hell of a lot of fuel in your donk.Blow compressed air around spark plug holes to remove grit,remove all the plugs,put them back in their caps and ground them to the engine away from the spark plug holes in the cylinder head,Crank it over for a while,not too long,reinstall plugs and crank it over.It should be a goer.All the best luck liesel...Tabby.

Posted on Oct 08, 2009

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Need to clean out my pistons

Hi, Jeff I hope your talking about carburetor pistons/slides and not engine pistons, if your bike has been sitting idle for months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will idle and run poorly, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition.
1. If your battery was 3 years or older when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging remove the leads and let the battery sit for a couple of hours then check the battery voltage with a volt meter, you should have 12.5 volts or better, any readings in the 11 volt range you need to do a proper load test on the battery and replace as necessary, any readings in the 10 volt range you have a dead cell and replace the battery.
4. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
5. Remove your air cleaner and clean and re-oil per Mfg. specifications.
6. Remove the carburetor, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
7. Remove fuel valve and filter disassemble and clean as necessary, remove fuel lines and replace with new ones.
8. Replace spark plug with a new one and check for spark.
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My Yamaha TTR250 1998 model starts and idles fine but when you put it into gear it stalls the bike?

I had an old YZ465 that use to do that. Has it sat a long time? I found on mine the clutch discs were stuck together. I use to start it and then push the bike and jump on and hit it in gear. That would break the discs loose. After that it would work fine until I stored the bike for a long time again.
Hope that helps. Just go easy with it, because the springs force all the oil out from between the clutch plates so they will be dry for just a moment where they were bound together..

Oct 27, 2010 | 2002 Yamaha TT-R 250

1 Answer

Bike starts fine as you start to move in low speeds bike cuts off odesnt idle

Could be the gas tank vent in the gas cap stuck. Try opening and closing the gas door and try again. It is a throttle by wire if memory is correct so this may be something to take to a dealer.

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1991 Fzr600 Hard Starting

when it comes to coldweather you go to hotter plugs O one more thing did you synchronize your carbs. IF not get a set.

Mar 23, 2009 | 1991 Yamaha FZR 600

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