Question about Honda Motorcycles

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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

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 xlch@mail.com 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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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.

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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.
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Oct 22, 2010 | Honda Garden

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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.

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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

Hi I have a 1985 Yamaha xs 650.It is back firing out both excusts. Left cyl spark plug is wet with fuel. Right hand cyl is running hotter.Bike starts ok but back fires on Idle both cyl... Hope you can...


Well the most problems are in the carbys {running to rich or to week} and with 2 carbys you must have them in tune with each other by about 98%.
and with a plug getting wet your float level is to high so when your going the fuel is getting to much in that cylinder and putting out a strong mixture and the other one to weak and you could also have a gasket on the intake sucking air or the exhaust has a bad flang gasket or a small pin hole in it some where
WHEN idleing put your hand over the tailpipe and stop the exhaust and see if you can hear a small blow if so fix it and the same the other side.
AS ITS ALL TO DO WITH HEAT AND INCORRECT MIXTURE so L/H is to much fuel,,,R/H cyl is running almost correct but wants tuning.
Have a goodday RON

Nov 13, 2009 | 1980 Yamaha XS 650 G

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.
Jordan

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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