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1987 250x

1492 Views 19 Replies 4 Participants Last post by  tylerjones
I bought my first semi-vintage bike, when I went to test ride the bike he had the idle turnt up pretty high. I test drove it bought it went home, opened my new toy before I got home (as every kid does lol) parked it. Last night I cleaned the carb and diaphragm out. I put the setting ton the carb back to where they was before I tore it does except for the throttle speed. I turnt it down so ots not high revving. I cranked her up, she would idle but not move, so I removed the side cover on the right side of the bike covering the throttle cable and pumped on the diaphragm because when I hit the gas it did not move well. So I got the bike to drive after that, she hesitates when I give it gas but it will slowly get up to speed if I dont hit the gas hard. After the test ride she cut off and wouldnt crank. She was really hot as well, hotter than normal. I pulled the spark plug and it was black. Cleaned it, installed it back and she cranked up. But yet she is running hot still. I know cleaning the plug wont cool it down. So I ordered a carb rebuild kit, that will be here sunday. Is there anything else that I should do to help cool this thing down or maybe is it my fault for inproper carb adjustment? I'm going to adjust the valves today as well and tinker with the carb until the new parts get here
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So I tore down the carburetor again to tinker around before the new parts came in, everything's there like it should be from reading the manual. I lowered the clip on notch on the throttle needle I noticed that the guide on the other side of the carburetor has threads and an adjustable nut on it. How do I go about knowing if that is at the proper height?
I rebuilt the carb slaped it on and it fired up first kick, it runs smooth until you get on it. It acts like the reve limiter is engaging! Is that to much fuel being dumped at once? Can I fix that problem? Or does that mean theres not enough fuel to catch up with the acceleration?
It sounds like the choke is engaged until it clears up
This is the piece I mentioned I'm not sure how this needs to be adjusted


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That's how far it is I assume it needs to scoot down some?


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Well I adjusted it as far as it would go which was not further than where it was at in the picture. It drives better, when I hit the gas it still has a delay but it pheesable until the rebuild kit comes in.
Also I after I adjusted the valves its smokes pretty good now, is that improper adjustment or maybe wear and tear?
I adjusted the brass piece in the last photo up towards the seat as if the carb was on the quad and I also brought the needle up towards the seat, moving the C clip down on it to the 4th notch I believe it was. I have a 02 300ex an I compared carbs, they look identical, on the 300 the needle is on the 3rd notch and the brass piece up towards the seat as well and she runs strong. So maybe since they are identical could I set the 250 carb up like the 300?
The smoke it strong when first cranked and strong when on the gas, it doesn't have an oil smell but it's kinda gray. I couldn't really tell it was real humid (sticky) today and kinda dark due to implement weather
Soo. I bought a new carb, a japan built carburetor. I installed it and the quad cranks first kick. But still Boggs down when throttle is applied aggressively. Maybe the needle with the C clip needs adjustment? I adjusted the fuel mixture needle too 2.5 turns out and went in an out still nothing changed.?
I have not tried the cdi. I am getting a new coil and plug tomorrow if honda is open if anything maybe a uto parts store. I adjusted valves to what the repair manual states. .004
I have not done a compression test yet. I dont have a gauge in my possession yet.
I was thinking in my head maybe the petcock or fuel screen in the gas tank(if there was one?) Could be clogged up and when the gas is applied the pressure draws the trash together clogging the flow? The gas cap is free of debris.
The valves was very tight when I got the quad as well.
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