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  #1  
Old 06-26-2013, 07:17 PM
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Default 1990 honda cr80 WONT IDLE??/?

     

right my bike will not idle and isnt responsiveon low revs sort of boggy once it goes its fine and hits band, but it so annoying going slow round a corner for instance it goes to die i have to pull clutch and rev it like mad sometimes it just dies. iv cleaned carb checked main jet thats all i know to do what should i do with the air and idle screw. i dont want to touch it and then the bike not start planning on going out at weekend. also is it normal for there not to be much power until band?? and powerband seems to take so long to come in. for example i have no 4th gear so i screw 3rd then gear up to 5th then it goes so slow sometimes bogs and takes forever for powerband to come its great once it does it flys

any help is appreciate thankyou very much to everyone that helps
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Old 06-26-2013, 09:22 PM
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Alright firstly why don't you have 4th?

Onto your main problem, seeing that your fairly new to the site I'd only assume you haven't read many threads about float height and required carb maintenance ( yes just like everything on a dirt bike they need servicing!! ).
I would say that judging by the year that yours is starting to run rich due to incorrect float height/fuel level, also it is likely that the float needle is worn and not sealing 100% allowing excess fuel into the carb. As opposed to an airleak, running overly rich will cause the bike to act like yours is. I would suggest you pull the spark plug and tell us what it looks like-it should be a brown-esh tan colour, if black and sooty/slightly wet ( which wouldn't suprise me ) then it's a clear indication that your running rich.

It's best to search the base knowledge here for information about setting the float height!
A manual is a must-I'm sure a suitable one can be purchased easily for correct float height specification. My bets are on the float needle being worn, float height being incorrect etc. easy fix-replace the needle and set the floats!

Hope this helps.

FYI-do not rejet the pilot circuit to cover over an underlying problem. Set floats FIRST then work on jetting ( if necessary )

As don't be intimidated by setting float height, it's the single most commonly overlooked part of basic maintenance that you need to know how to check and correct!!!!

---------- Post added at 10:29 AM ---------- Previous post was at 10:26 AM ----------

Don't forget to check that the air screw is set correctly!

---------- Post added at 10:52 AM ---------- Previous post was at 10:29 AM ----------

While your at it, check the enricher valve is actually sealing well too as this can cause a rich condition!
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Old 06-27-2013, 06:19 AM
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I last checked the plug it was really wet n black so I replace it with a hotter br8hs and not had that problem since. But the plug is a little black your right. How do I go about setting the air screw? Ill have a look around see what I can find about float is there anyway I can tell if the needle needs replacing ?thankyou very much for your response
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Old 06-27-2013, 09:42 AM
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Ok firstly don't ever go to a hotter plug in an attempt to cover other issues!! Your only asking for trouble later....
Look on eBay for a manual.

The float needle is probably going to need replacing so just order one from bikebandit. I wouldn't bother trying to use the old needle.
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Old 06-27-2013, 03:51 PM
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Just checked the jets main 125 and other 52 which is stock. Any help on setting the float? My dad is going to do it but how do I measure it? I believe it should be 19mm? Need this doing to rule out the carb then ill check other things

---------- Post added at 08:51 PM ---------- Previous post was at 07:46 PM ----------

Set the float what should I do next if that doesn't work?? More info low rpm there isn't mich power and sometimes bogs where I have to pull clutch and rev it like mad but there is. Nothing coming out the exhaust I'm lost if this doesn't work
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Old 06-27-2013, 03:55 PM
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Ok there is a post up in the base knowledge section on here, it's explained very well!! Better than I could ever. Your best bet is to read through that section and if your dad is going to help get him to read too. I think you overlooked that I said to get a new needle(????) .......

Where did you get the info about the 'stock' jetting? I would again advise to get a manual.........

---------- Post added at 05:25 AM ---------- Previous post was at 05:24 AM ----------

I'm also curious as to why you don't have 4th.......
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Old 06-27-2013, 04:13 PM
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I can't remember some website gave all jet sizes for my carb and I checked my jets there both the same. And I bought the bike used and couldn't test it only cost me 250 so I can't moan lol
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Old 06-27-2013, 04:18 PM
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Hmm don't trust everything the Internet says.....

I'd be suggesting you check up that 4th gear problem......before you end up needing a LOT more advice about your engine .....
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Old 06-27-2013, 06:46 PM
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I wouldn't know where to start with the bottom end lol
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Old 06-27-2013, 06:53 PM
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...ok well let's just fix the problem at hand !!
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Old 06-28-2013, 09:41 AM
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One question if I was going to get fresh piston rings n stuff will I need to get a new barrel?
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Old 06-28-2013, 09:59 AM
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You need the cylinder measured and checked to see if its spec. If not a replate is in order.
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Old 06-28-2013, 10:35 AM
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Forget that then lol no shops near me there's one and he is a poor mechanic always come back worse lol ill just swap it on
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Old 06-28-2013, 10:51 AM
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You may find a new barrel which can be just as reasonable as replating one
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Old 06-28-2013, 11:19 AM
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Getting complicated now lol I don't know much about bikes
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Old 06-28-2013, 03:24 PM
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Right big problem, started the bike an petrol pissed out the bottom of carb checked float wasn't sticking go to put carb back on and can't get the needle/slide thing to drop into carb:/ me n y dad have been trying for 40mins straight it will not drop in never had this problem before looks like no track tomorrow for me
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