Question about 1985 Yamaha FJ 1100

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Tach moving slowly

Just the other day my tachometer stopped workin correctly. It just climbs real slow and won't go past 4,000 rpms. I think I heard somewhere that sparkplugs will do this but I'm not sure because the bike is still running fine. Also I checked the cable and it looks fine. Thanks

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Bad plugs or other electrical problems can mess with an electronic tach. Yours has a cable so it sounds like a mechanical drive. If so, it is probably your drive cable. take it off and pull out the inner drive spring, clean it well, as well as the inside of the outter cable, then either use a light grease or oil to lube it before re-installing it. Check both ends of the drive cable for wear or rounding off.

Posted on Nov 10, 2008

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How to adjust the fuel and air mixture on a 1982 ford 4.9 six cylinder, carter carburetor.


There should only be 1 screw located at the base of the carb facing outward.

The method I use requires a tachometer. If you don't have a tachometer then you can use the "by ear" method, though it's not as accurate.

With the engine off, start by turning the screw all the way in, then back it out 1 and 1/2 turns. This usually give you a baseline to start with.

Start the engine and get it up to operating temperature, make sure the choke is fully open, and have the air cleaner and all vacuum lines installed.

Using the tachometer (or ear) turn the screw (usually out) until the RPMs increase. If they don't increase by turning the screw out, then try turning it in.

Eventually the RPMs will stop climbing while turning the screw (as said earlier, usually out).

THEN turn the screw the opposite direction (usually in) until the RPMs JUST start to drop off. That should be real close to the optimum setting.

This setting is ONLY for the base idle air/fuel mixture and is NOT for anything else.

Hope this helps.

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1 Answer

Have an fx45.Should the tach read 25-3000 ROMs when moving at 75mph? Auto tranny seems like it should be in higher gear.


there is not info to be able to give a definite answer
to work it out
you have top know the diff ratio, wheel tyre circumference to be able to work from rpms of the engine to road speed
However as a pointer, most cars will be around 3200 rpms at 60mph as this will be direct drive and od causes a drop in rpms
Being an automatic find yourself a good section of low traffic road and start from stop slowly increase the rpms and watch the rpms. keeping the accelerator steady you will see when the auto changes by a drop in rpms. slowly increase road sped until you see the next drop in rpms and so on. Over drive normally comes in around 55 mph or around 3000rpms
I would think that it is working because 3500rpms at 75mph is reasonable rpms to be expected. If it wasn't working I would expect the rpms to be around 3800 to 4000.at 75mph

Feb 07, 2015 | Cars & Trucks

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Cant accelerate past 4,000 rpms


Intake leak of bad mass airflow sensor. You can clean a MAF.

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2002 Santa Fe 127174 miles. On hills car slows dwn, rpm is climbing, speed is droping. on steep hills from a dead stop rpm's are 4,000 speed is just below 20mph. have had the fluid flushed twice.


sounds like your transmission is going bad fast. get it checked asap to see if it can still be saved. aamco will take a look at it. if its completely bad, then getting a new transmission might be cheaper than getting the current one fixed so look into that!!

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Hi ..i want to know what kind of tachometer i need to use to chek the chainsaw RPM


Boy oh boy there are a lot of tachos here, unfortunatly non i would choose, you need a tacho that picks up the spark pulse from the spark plug, not one that requires a photo tape placed on the machine, Both Husqvarna and Stihl retail good quaility tachos, just place it near the spark plug and it gives a very accurate reading, they are called DET102 the Husqy part no. is 502711401.

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I have a 94 dodge Intrepid ES 3.5L Okay when i go to accerate my car if i push the gas down real fast my car jumps then the Rpms start to rev up it doesnt shift after that, rpms just keep climbing. If I...


Well the tcm is going into limp in mode. Have the vehicle scanned. If it is in limp then it has a trouble code in the tcm. This will give you a clue to what is going on.

Apr 22, 2010 | 1994 Dodge Intrepid

1 Answer

Tachometer not working


there's really only two parts too this

ones the crank trigger and if it starts and runs you got that workin
the other and yes they go allot is the tach movement in dash or driver module just in back of it
ford wants too much for new inst cluster
junk yd is gonna make you buy whole dash
Aftermarket is the way to go I got a nice one used off a auction site for 50 bucks mounted it right infront of old one (Done)

Nov 26, 2008 | 1993 Ford F350

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