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Ihave a1977 400t honda that wont run on 2 cyls at idle cuts in at 2500 revs carbys sonic cleaned plenty spark help. Thanks

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Try condenser.

Posted on May 22, 2017

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Check that the spark plug boots aren't wet or worn. Sometimes the spark leaks to the cylinder head.

Posted on May 19, 2017


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1 Answer

Mculloch line trimmer,starts&runs wont rev high will cut out. Thanks

fit 2 new diaphragms to the carby then adjust the screws
adjust the high speed screw first then the idle screw

Nov 17, 2017 | Garden

1 Answer

1977 CB400t Hawk will not idle

Hi, Philip I can help you resolve this issue but there are 2 main reasons along with a bunch of variables that prohibit me from doing it on this platform:
1. I do not know the history of your bike.
2. Multi diagnostic issues, fuel, electrical, mechanical etc.
The best thing to do is to contact me at so we can address these multiple possibilities.
Good luck and have a wonderful day.

May 19, 2017 | 1977 Honda Cb 400 F

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Ihave a 1986 honda shadow 500,starts but won't rev

make a compression test on 2 cylinders,

May 07, 2012 | 1986 Honda VT 500 C Shadow

1 Answer

2 stroke Victor Mayfair Delux (old mower) Have cleaned our carbi. Plenty of petrol coming from. Can get it started but to keep it running with reasonable revs I have to keep the flooding device down with...

Hi, from your question it sounds like you have an idling problem. To fix this you have to adjust the idle speed screw that is located on top of the carb. Turn that screw in (clockwise) for faster idle speed. Hope this helps. All the best and good luck.

Feb 09, 2011 | Garden

1 Answer

My 5.5 honda engine on my lawnmower will start but wont stay running already cleaned the carb out didnt help there is no restrictions in the fuel lines im lost please help

it sounds like a fuel problem.
first drian fuel out of tank.
i know you have already cleaned the carby but dis assemble carby and clean with carby cleaner.
re assemble carby & fill tank with fresh fuel.
also clean air filter & check oil level & check spark plug,if the spark plug is black and the tip is blocked with oil build up, then replace.

Oct 22, 2010 | Honda Garden

1 Answer

Have Honda CT110cc postie bike starts and runs well however when warmed up and choke auto off will not idle. Checked air filter/plug/fresh petrol/carby is clean jets etc. Also revs excessively without...

Sounds like you have a vacuum leak between the carby and the head. Check the O ring that is between the carb and manifold. Replace if it doesn't sit proud of the locating groove.

Aug 16, 2010 | 2005 Honda CRF 100 F

1 Answer

My honda 1000i sputters when at low idle what could be the problem? i cleaned the carb and made sure there was no blockages. if i leave the choke on at half it idles good. I cleaned the air filter and the...

Carby has a blocked air jet, you will need to carefully remove the idle air bleed and blow compressed air in. Thats the short cut option. The better way is to remove strip / clean carby.

Mar 09, 2010 | Electrical Supplies

2 Answers

1977 yz80 wont start. Cleaned carburetor, checked magneto, but cant get to start having problems getting spark, replaced plug.

If you have a spark, but weak. It is possible that your flywheel is demagnetised. Then you'll need a spare.
If sparks are good, then the spark plug should be moisted with fuel after a few ( 10 ) choke kickstarts. If so you'll have a weak compression. Then you have to at least clean out the piston ring grooves ( dismount cilinderhead and cilinder ), or even change the piston rings or overbore the cilinder and place a new oversize piston kit.
If spark plug stays dry when kickstarting, the carburettor is faulty. Clean it out, check also the choke system. Check the air intake between carb and cilinder for air leaks.

Oct 04, 2009 | Yamaha YZ 125 Motorcycles

1 Answer

This is a 3 wheeler 125 m honda one cyl runs

Sounds like a loose piece of crud in the main jet. Have you had the jet and tube above it out? It could also be a spark problem. See if you have spark when it tries to die ( put a nail in the plug boot and get it sparking 1/4" or so to the plug at idle then rev it up, it should continue jumping. I think that bike will also have mechanical spark advance on the rotor on the end of the cam. If the springs are loose on that the spark timing will be all over the map and can make it run intermittantly.

Sep 30, 2009 | 1984 Honda XL 125 R

1 Answer

Bike wont start

Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Clean the air filter. Install a new stock NGK spark plug.

Please rate this solution. Thanks!

Apr 19, 2009 | Honda XL 125 R Motorcycles

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