HONDA H100 - OLD BIKE HELP!

[ojmit]

Hi all

got a 86 honda h100 - running fine for ages then.....started cutting out - changed air filter, battery, oil pump and throttle cable, plug.....now starts but immediately jumps to max revs and stays there.....any ideas?? had the carb off and cleaned it through......

[RhynoCZ]

Does the throttle work properly and are you sure the choke is not stuck?

And the basic question, what about the idle screw?
____________________
'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[stinkwheel]

I'd suggest either a sticking throttle or an air leak round the inlet manifold
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[ojmit]

CHEERS - how would i sort these out?

[stinkwheel]

Throttle sticking would be my starter for 10.

First off, check you put the throttle valve back in the right way round. Cutaway to the rear. Also make sure the throttle needle hasn't come adrift when you put it back in, there isn't much holding it in place, if you didn't get it cleanly down the main jet when you put it back together, it can push up into the middle of the throttle body.

If you take the carb rubber off, you'll be able to see the throttle valve moving as you open and close the throttle.

Other potential causes are things like the cable having come off its runner in the twist grip and a poorly routed cable.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[cb1rocket]

it appears there has been alot of fiddling for no reasons. alot of the random cutting out is down to the ignition switch playing up.

[RhynoCZ]

It could also have been the fuel tap, on my former bike GPz550 the faulty fuel tap (blocked with dirt), did caused cutting out + I had dirty tank breather, if I rode it in high revs a while, it caused the same thing
____________________
'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[ojmit]

cheers all - after a lot of mucking about - took the carb off again..the pin that holds the float holder on has come off its mountings - tried to reattach....then replaced, bike started but then fuel came pouring out the carb drain plug........reckon i have to buy a new carb????

[stinkwheel]

I think you should post photos of the parts in question because you are giving every impression of not knowing what you're talking about.

Carb upside down, float bowl removed, in good light, in focus and of a decent resolution.

So like this:
https://i19.photobucket.com/albums/b183/Dave_ett/NSR250/floatvalveremoval.jpg

Not like this:
https://www.dirtygirlmotorracing.com/articles/carb-game/8-carb-float.gif
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[unitynotsocri...]

as other posters but check the oil pump cable n flow as well.

if its got points then it may be just a timing issue
____________________
nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS