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Old 12-12-2009, 11:37 PM   #1
TrappedAtWork OP
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Question Honda CT110 - will not idle

Hi All,

Spent the day in the shed (sorry Cob "racing workshop"), so overall a good day.

We have a honda CT110 postie, that we thought had a sticking throttle cable, so set about trying to fix it today.

We cleaned the carbie out, took the bowl off and blew out the jets, all seemed ok. Reassembled with no spare parts. Everything appers to be normal.

The problem:

We can kick start the engine, with just a little throttle to get it going.

Idle will not hold the engine, therefore we must hold the throttle on just slightly, to get it to idle.

After reving engine it will return down to near idle speed, the die if the throttle is not held on. After reving a few times in a row and closing the throttle the revs continue to rise, until the engine seems it is about to explode. (They make a lot of noise at 15000 revs )

We unscrewed idle screw a turn or two and the revs fall, the engine will die if the throttle is not held on just slightly.

We also tried to take out the free play in the throttle cable, near the twist grip.

The throttle cable does not appear to be sticking.

This is a very small slide carbie with a long needle through the middle of the air flow chamber.

Air filter is clean, added fresh fuel to the tank.

Box of matches standing by.


Any thoughts gratefully accepted...


Cheers,

TAW
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Old 12-13-2009, 06:37 AM   #2
showkey
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The pilot jet (also know as the slow jet is plugged) it is a very very small hole and you should hold up to the light to check, you can pass a small wire through but be careful not to inlarge or ream the jet larger.

This asumes the air screw is open about 2 turns as a starting point.
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Old 12-13-2009, 07:01 AM   #3
mcma111
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Slide

Did you put the slide in backwards???
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Old 12-13-2009, 07:17 AM   #4
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Quote:
Originally Posted by mcma111
Did you put the slide in backwards???
That can cause the problem as well as a too tight intake valve clearance.

Mike
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Old 12-13-2009, 09:42 AM   #5
showkey
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Quote:
Originally Posted by mcma111
Did you put the slide in backwards???
Not really possible and still have run off idle.....the slide has a slot and the slide bore has a pin they must line up for the slide to be in the down or closed position.
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Old 12-13-2009, 09:45 AM   #6
showkey
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#14 is the pilot or slow jet

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Old 12-13-2009, 12:07 PM   #7
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It is possible you are barking up the wrong tree

I have about 30,000 miles experience on trail 90s. It sounds like you should check the spark advance. This is a mechanical unit behind the points up on the left side of the head. if this sticks, it is impossible to set the idle. You can wash the advance out with some wd-40 without removing or re-setting the points and see if that allows you to set the idle. if it helps the real solution is to remove the advance unit and clean and grease it.

Kyle :-)
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Old 12-13-2009, 12:50 PM   #8
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You can ask these folks. They have alot of CT experience. I would like to have been able to go on one of these rides, looks like a blast!

http://rides.webshots.com/album/229770370jeQVmM




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Old 12-14-2009, 02:04 AM   #9
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Thumb

Quote:
Originally Posted by showkey
The pilot jet (also know as the slow jet is plugged) it is a very very small hole and you should hold up to the light to check, you can pass a small wire through but be careful not to inlarge or ream the jet larger.

This asumes the air screw is open about 2 turns as a starting point.

Thanks, I believe this this the problem.



From memory, I think the outlet from the Pilot screw (circled in red) is blocked, I will pull it apart and have another look. I did not really pay attention yesterday.

I'll take a look as soon as I can get to the racing workshop.
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Old 12-14-2009, 02:07 AM   #10
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Quote:
Originally Posted by mcma111
Did you put the slide in backwards???
Cheers but I don't believe so, there is only one way that it goes in.
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Old 01-09-2010, 03:17 AM   #11
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Thanks to showkey.

The postie now idles.... Cheers...

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Old 05-01-2010, 09:37 PM   #12
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Quote:
Originally Posted by trail90man
I have about 30,000 miles experience on trail 90s. It sounds like you should check the spark advance. This is a mechanical unit behind the points up on the left side of the head. if this sticks, it is impossible to set the idle. You can wash the advance out with some wd-40 without removing or re-setting the points and see if that allows you to set the idle. if it helps the real solution is to remove the advance unit and clean and grease it.

Kyle :-)
I used oil to lubricate the advance assembly. Should I use grease? It seems to have significant resistance with grease. Does it matter?
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