Question about 1996 Triumph Triumph Thunderbird

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Bike runs fine up to 5000rpm - then hits a brick wall - carbs have been balanced - fuel flow checked - coils ok???

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Here might be a fiew things to check :
1) spark plugs try new ones
2) spark plug boots if they are resistor ones one could be bad
3) fuel flow - try running on reserve the tap could be dirty or just not letting enough though had this happen on my cr250 honda

Posted on May 09, 2010

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RD350 B type hits a wall @4500-5000rpm and hardly does 90kmph acceptably.


Did you rejet for the foam filter, you must go richer on the mains. And paper filters are completely adequate for most every type of bike, using foam or other so called performance filters on bikes can cause carb mixture issues and do nothing to increase power, rode 50 years so know a thing or two about bikes.

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225 Mercury optimax, surges from 4500 rpm to 5000rpm and back,won't reach 5600.


could be several things , Check fuel pressure and flow, if flow is low replace fuel filter, if pressure is low check fuel regulator, if ok replace fuel pump. Check throttle position switch for smooth movement . A misfiring coil or spark plug HT cables can also cause this fault.

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My suzuki gsf 600 misfires @ 4000-5000RPM only on cylinder 1


if its only on 1 cyclinder and your sure the carb and sparks ok then the next step is to do a compression test to see if the fault lies with the engine, i.e. valves, rings etc,

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My 1981 Honda "CB750K" runs rough at low rpm and


1 and 2 run off different coils so its not electrical
do a compression test after checking all valve clearances
clean the carbs
check for any cracked hoses to the fuel tap,
and check for fuel tap operation, and its not running on prime, no fuel should flow in the run or reserve position until the engine is running.

Oct 27, 2011 | Motorcycles

1 Answer

I have a NC30 that has been standing for about a year, the only reason for that is CDI issues. I bought a De-restricted CDI from Japan, replaced the Spark plugs and checked all fuses and connections. I...


Check your CDI on the other bike is a good option. if it was perfect before the CDI change then the new CDI is the only variable.
Wont be shimming.the valves need to wear to change that setting, and the bike has been sitting.
Sounds like its sucking air after the carby once over, but the balancing would have picked that up.
But how did you balance them if its idling at 5000rpm?
Recheck the carb once over,and balance, and make sure the fuel and vacumn tubes are in correct positions. check the throttle cable is replaced correctly
I assume it is running on all cylnders.

Mar 24, 2011 | Honda VFR 400 R NC30 Motorcycles

1 Answer

1982 suzuki gs650 runs, but not over 300rpm


better check for the ignition coil for proper sparking or igniting of current in the comprssion chamber, check the ignition coil spark plug wire, check the spark plug, check for proper fuel supply in the flow system to Carbs, check for Ignition timing of the bike, or still you cant solve or still worried then dont worry better take the bike to nearest aurhorised Suzuki service centre for better assistance on this problem surely the problem will be solved.

Jul 22, 2009 | 1982 Suzuki GS 650 GT

1 Answer

Flat spot from 5000rpm-6000rpm


it sounds like you have a blocked jet,pull the carbs out,remove the bowls and inspect /clean the fuel jets,be carefull not to overtighten the jets when you put them back in as they are only very thin brass and quite fragile..hope this helps

Jul 06, 2009 | 1998 Aprilia RS 125 Extrema

1 Answer

Honda rvf 400 1994 5000rpm problem


You were probably right when you mentioned the carbs. The only probable electrical problem would be a coil no longer being able to consistantly generate spark faster than 5000 rpm.

Your bike is 15 years old. It is probably time for a carb kit or two, BUT I would suggest you balance and sync the carbs to see if that takes care of the problem before I would do the carb kits. Also, if the fuel petcock, (gas valve), has a water trap bowl on the bottom of the bowl, remove the trap and check for water / rust / trash in the bowl. If you find anything other than gas then Drain one cup of gas from the tank to eliminate most of what was found.

Look to see if the petcock has a screen filter and clean it as well.
If you find any rust or other trash in the gas then get an inline fuel filter to clean up the trash. I would also run through a tank of premium fuel with a carb cleaning additive in the tank. Replaced your air filter lately?

Post a comment to ask more and to let us know how things turn out. I am hoping for a "FixYa" rating. Ride safe.

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2 Answers

Fzr6 running lumpy


il try n help m8,, can i start by eliminating a few things,, have u made sure all 4 carb floats are the same height ,they need to be, ,and there is no holes in the diaphrams at the top of the carbs,,even a pin hole will give u grief,, ,,wot happens wen u pull the choke out wen motor is warm and idling,, if it evens out and pipes warm up then theres a blockage in 3 and 4 carb,and idel jets,or could have a split vacume pipe, or a air leak between the carb and cylinder,,if all fuel symtoms are ok ,, then make sure the coil wires are on properly, and good spark on the coolest cylinders, , try swapping over the coils to to see if the left cylinder becomes cooler than the right,,hope that gives an idea,,

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