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  #1  
Old 19th November 2017, 09:25 PM
Darragh356 Darragh356 is offline
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Motorbike: Honda Hornet 250
Modifications: None
Default Honda Hornet 250 stopping when warm

Hi lads, newcomer to the forums. Recently bought a 1996 Hornet 250, the bike is starting on all 4 cylinders and running perfectly while cold, itís just moving off cold on the temp. Gauge and goes down to 2 cylinder for a few seconds and then stops, the bike wonít start or run for 5 to 10 minutes until it cools again and away it goes again till it warms again and the same thing happens. Correct new spark plugs are in place, coils and leads were changed, carbs have been cleaned and are operating correctly as far as I know, tank has been cleaned and fuel tap diaphragm has been checked,the tank cap is also venting correctly so fuel is flowing as fair as I know,there is no obvious wiring issues, no poor connections to my knowledge that I can see, Iím thinking myself itís an electrical fault? Some wire heating and breaking a circuit or maybe a coolant sensor telling the cdi unit the bike is hot and shutting it down? Anyone able to shed some light on the situation, thanks 👍👍👍
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  #2  
Old 19th November 2017, 10:12 PM
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sharpbikes sharpbikes is offline
bike broke
 
Biker.ie Member No. 30720 from Offaly
1,829 posts since Jan 2013
Motorbike: GSXR750, zx7/9r, vfr400
Default Re: Honda Hornet 250 stopping when warm

could be any number of things such as coils breaking down under heat or valve clearances not properly adjusted. could also be damage to the engine that causes compression leak when warm like a cracked liner, fairly common on hornet 250's from what ive seen.

great bike, had one for many years and rebuilt it from the ground up. very easy to work on and a gem once looked after!

also be worth wile to post an introduction in the relevant section
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  #3  
Old 19th November 2017, 11:39 PM
Darragh356 Darragh356 is offline
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Biker.ie Member No. 37804
5 posts since Nov 2017
Motorbike: Honda Hornet 250
Modifications: None
Default Re: Honda Hornet 250 stopping when warm

Originally Posted by sharpbikes View Post
could be any number of things such as coils breaking down under heat or valve clearances not properly adjusted. could also be damage to the engine that causes compression leak when warm like a cracked liner, fairly common on hornet 250's from what ive seen.

great bike, had one for many years and rebuilt it from the ground up. very easy to work on and a gem once looked after!

also be worth wile to post an introduction in the relevant section
Yes from the time that I managed to rider her Iíve fallen in love, thanks for the advice, compression testing her might be one of the next steps Iíll take, the bike has 42km on it with no smoke or burning oil so hoping my internals are okay, maybe valve clearances yes bud, thanks for the help 👍
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  #4  
Old 20th November 2017, 12:08 AM
Olaf Maxwell's Avatar
Olaf Maxwell Olaf Maxwell is offline
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Biker.ie Member No. 26492
1,460 posts since May 2011
Motorbike: BMW K100LT92 K100RT84
Modifications: None
Default Re: Honda Hornet 250 stopping when warm

Heat can affect two things on it. A position sensor is one, other as you correctly identify are valve clearances. Easy to check.

First off see also if you can identify what cylinders are going off on you. If a matching pair like 1/4 or 2/3 and you have only 2 coils swap them and see does the problem move.

If it does then coil is your problem. Not uncommon for a coil to break down when ti gets warm.
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  #5  
Old 20th November 2017, 12:26 AM
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Default Re: Honda Hornet 250 stopping when warm

Knowing the bikes my first guess is head gasket.check the coils first and check its not clearances but normaly when these feck up its the gasket
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  #6  
Old 20th November 2017, 01:50 PM
Darragh356 Darragh356 is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 37804
5 posts since Nov 2017
Motorbike: Honda Hornet 250
Modifications: None
Default Re: Honda Hornet 250 stopping when warm

Coils were the first thing to be checked and changed and no difference, maybe valve clearances or compression so, thanks for the help lads I’ll let ye know how I get on
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  #7  
Old 20th November 2017, 02:00 PM
Darragh356 Darragh356 is offline
Wobbling Fledgling
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Biker.ie Member No. 37804
5 posts since Nov 2017
Motorbike: Honda Hornet 250
Modifications: None
Default Re: Honda Hornet 250 stopping when warm

One last thing which I forgot to mention, when she does stop, she will run and will start if the choke is on but without the choke she wonít start again till she cools down, if that makes any difference
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  #8  
Old 20th November 2017, 02:20 PM
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Default Re: Honda Hornet 250 stopping when warm

might just be blocked pilot jets .hard to tell without looking at it really
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  #9  
Old 4th December 2017, 06:10 PM
Darragh356 Darragh356 is offline
Wobbling Fledgling
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Biker.ie Member No. 37804
5 posts since Nov 2017
Motorbike: Honda Hornet 250
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Default Re: Honda Hornet 250 stopping when warm

Originally Posted by chopper View Post
might just be blocked pilot jets .hard to tell without looking at it really
Iíve now at this stage managed to compression test it, readings while engine is cold are 100, 100, 25, 80psi. All valve clearances within tolerance bar 1. Presuming itís head gasket problem at this stage? If Iím to do the head gasket in it, have you the torque specs for the bolts chopper by any chance? I canít find them anywhere online, cheers
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  #10  
Old 4th December 2017, 06:55 PM
johnny b johnny b is offline
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Biker.ie Member No. 5067 from Kildare-ish.
4,386 posts since Apr 2007
Motorbike: RR4 Blade
Modifications: Arrow can, pc3.
Default Re: Honda Hornet 250 stopping when warm

As they are gear driven cams you have very little play in them to skim the head so take this into consideration.
Use the same tourque settings as the cbr250.
Same engine, the manual is available online in english.

A replacement good engine may be a better option.
Check a few breakers.
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  #11  
Old 4th December 2017, 06:57 PM
johnny b johnny b is offline
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Biker.ie Member No. 5067 from Kildare-ish.
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Motorbike: RR4 Blade
Modifications: Arrow can, pc3.
Default Re: Honda Hornet 250 stopping when warm

Thats 25psi is the issue, it may be a fuct valve, fuct rings, cracked piston, head gasket, bottom end bearing but you wont knkw till you open it.

Was it rattling sounding?

Last edited by johnny b; 4th December 2017 at 06:58 PM.
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  #12  
Old 4th December 2017, 07:33 PM
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Olaf Maxwell Olaf Maxwell is offline
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Motorbike: BMW K100LT92 K100RT84
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Default Re: Honda Hornet 250 stopping when warm

Check the valve clearance on the 25psi cylinder, if its very tight or non existent fix that and redo the compression test.

Bad rings or piston would probably be using oil on you or blowing blue smoke and if that's not happening head gasket is the one to go for.
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  #13  
Old 4th December 2017, 08:17 PM
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sharpbikes sharpbikes is offline
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Motorbike: GSXR750, zx7/9r, vfr400
Default Re: Honda Hornet 250 stopping when warm

when removing the head you need a 3/8 inch 12 point socket for head bolts which i found hard to come by. could be rings, pistons cracked or holed or cracked liner or head, open it to tell, could be knackered valves too or head gasket.
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  #14  
Old 5th December 2017, 06:57 PM
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Default Re: Honda Hornet 250 stopping when warm

Originally Posted by Darragh356 View Post
Iíve now at this stage managed to compression test it, readings while engine is cold are 100, 100, 25, 80psi. All valve clearances within tolerance bar 1. Presuming itís head gasket problem at this stage? If Iím to do the head gasket in it, have you the torque specs for the bolts chopper by any chance? I canít find them anywhere online, cheers
oh its mental small . id say 50 nm or therabouts . if you go too far the bolts pull out of the head and you need a lot of work done or an engine .dont over torque them or try nip them up a bit .
head gasket going on them usualy leave ubbles coming out at the radcap when its running (compression leak to cooling system)
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  #15  
Old 5th December 2017, 07:00 PM
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Default Re: Honda Hornet 250 stopping when warm

id do that valve thats tight ?, is it on the 25psi cylinder ? if you do end up doing the head i could post you the loan of the long reach 12 point socket for the bolt near the cam sprocket tunnel .
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