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Help Got new battery, worked for a week. now won't fire, just backfire. Plz help.. I'm in Melbourne, Aus

Discussion in 'Honda 250cc In-line 4's' started by talstails, Jul 28, 2017.

  1. talstails

    talstails Member

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    hi all..

    So I got a new battery put into my cbr250rr mc22 1993... the bike was working for a few days.. it has been almost a week.. It has been on the trickle charger ever since.. Tried to ride it today.. wouldn't start up.. it tried.. but started to backfire..

    Could it be the new battery?

    Or spark plugs?

    Carbies?

    Fuel blockage? I had a fuel blockage a few months ago in the past but my sooky boyfriend at the time finally took the tank off and blew through the hose that was connected between the petcock and fuel filter from memory.. He tried to blame it on every other single thing.. but I insisted he have a look at that and to clean the carbies.. he never cleaned my carbies..

    I'm no good at taking the tank off myself nor cleaning carbies or finding fuel blockages.

    I'm hoping some nice experienced dude here in Melbourne can help out this nice chick here.. it is doing my head it.. I can't win! Please help me. Thanks.
     
  2. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    A boyfriend that won't even clean your carbies shouldn't even make it into the friend zone IMO but I want to avoid giving you relationship advice :prankster::prankster::prankster:

    However if there was a fuel filter blockage start there and work your way down. Was the fuel filter replaced? Is there a filter screen in the tank itself?

    Potentially the popping and not starting is insufficient fuel, you'd likely smell fumes if it was excessive fuel.

    But it's also worth checking the simpler things also like spark plugs which will tell you also by smell if it's getting fuel.

    Someone with a CBR will hopefully chime in with specific advice on removing and cleaning the carbies - it may be as simple as checking the float bowl on the first one for sludge
     
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  3. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Basics first, are you using choke when trying to start the bike?

    If you've had blockages, it would be worth going over the carbs. It sounds like your pilot jets may be blocked. Some compressed air or carb cleaner/threebond through them should clear out the gunk.

    Once you have the carbs clean you should probably look at installing an inline filter to keep them clean, and give the tank a clean out.
     
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  4. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Get a new boyfriend :cool:
     
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  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Outrageous that you should say that, but it's correct, so I concur :cool:
     
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  6. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Welcome to the forum :thumb_ups:
     
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  7. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Whoops yeah we missed that part, well I did anyway and went straight onto the cheeky banter...but we can be informative and helpful as well as potentially amusing

    Welcome
     
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  8. talstails

    talstails Member

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    thanks.. well that is why he is my ex.. unreliable .. self centred.. not nice to me.. useless haha..

    I got an inline fuel filter in it.. maybe it is blocked? Last time my ex thought there was a blockage between the inline and the petcock in the fuel line bit.. so he blew it out.. finally.. after wasting time playing games with other stuff ..

    Yes.. tried with choke pulled out..

    I'm no good at taking the tank off myself or cleaning the carbs.. otherwise I would have done it..

    But no one from Melb is interested in helping out a poor girl like me that knows something or can do that hehe


    I got three of the 4 plugs out so far.. the 3rd one is always the hardest.. I'll try and tackle the remaining one on Sunday when I have time.. hopefully it is as simple as sparkies.. but I don't think I have luck..
     
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  9. Joker

    Joker See "about me" for contact details. Contributing Member

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    Hey, glad to see you found your way here. As I mentioned I'm not sure the battery is your issue...

    If it's backfiring but not starting I wonder if it's just flooded. Try and push start it (take it to a hilll or something and give it a run in 3rd or 2nd depending on how fast you think you can get). Might just turn the motor over fast enough to clear it out and go again.
     
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  10. jmw76

    jmw76 Well-Known Member

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    I had a similar problem that I was chasing on my MC22 track bike. I just could not get it started. Just backfired occasionally.
    The primary problem ended up being a fuel supply issue. The filter on the petcock valve (on the tube that fits into the tank) would not let any significant fuel flow through it.
    On inspection it looked ok, but would just not let the fuel flow through it. Replaced it and the problem was solved.
    I also replaced all the plug leads as well as they had gone hard and brittle and a couple where showing signs of corrosion where water had made its way into the back of the plug caps.

    Peter.
     
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  11. talstails

    talstails Member

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    So.. here is the story thus far lovely lads...

    I finally got sparkie number 3 out yeday morning.. and gave them all a clean.. they were wet blackish.. smelt of fuel.. stuck them back in again and fired the bike up and it started hehe

    Took it for a ride today after footy today with a corked thigh..

    So do you reckon it isn't adjusted properly to cause the plugs to foul.. run rich?

    Or.. due to my previous battery having lots of starting problems.. which I then replaced just over a week ago.. could that be the reason for the fouled plugs?

    Peter.. how do you get your plugs out easily... #3? Do you do it with the tank on still? hehe

    I was initially thinking I had a blockage in one of my fuel hoses, petcock or inline fuel filter.. Peter do you have an inline fuel filter on yours? Or is there a fuel filter in the tank? Which state are you in?
     
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  12. jmw76

    jmw76 Well-Known Member

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    Plugs are a real bitch to get out. You need tiny hands and a very skinny plug spanner/socket.
    You do not need to take the tank off. Access is through the front with the radiator swung forward a bit. You need to remove the clip/pin on the bottom radiator mount and it swings forward just enough to give you a bit more clearance. You will need to remove the front lower fairings. You can not really access the plugs from the top without removing a lot of stuff.

    If it is running now, ride it around for a bit to see how it goes. Plug fouling could very well have been from your previous battery issue. I have found with my road bike that if your battery is not up to scratch and you have difficulty starting it then it will foul the plugs. Once you get it all running, it seems to clear up. Also make sure you have good fresh fuel before chasing out issues.

    My bikes do not have an inline filter. Just the gauze filter on the inlet to the petcock within the tank. Personally, I would not run an inline filter. There is just not enough head between tank and carbs to get reliable flow. Fuel these days is pretty clean. I have seen MC22s at the track with inline filters (brand new) and they just would not rev out. Take the filter off and suddenly they came alive again.

    I am not into spending heaps of time trying to balance/sync carbs etc. As long as the parts are in good order (no air/fuel leaks) and they are not overly worn then you should not have too many troubles. Carbs do not go out of sync, unless someone farts around with them. The hours spent trying to sync carbs might make the idle and initial pick up a bit smoother but will not solve major running/not running issues.

    I am in Melbourne (Ferntree Gully).

    Cheers

    Peter.
     
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  13. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Welcome to the forum @talstails. @Joker runs Club250 in Victoria (http://club250.tk/). You should look them up as there's plenty of like minded 2fiftycc riders in the group and they have rides and "workshop" nights etc.
     
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  14. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Sound's like they are using cheap quality filter's that have restricted flow and filtering ability's, i can't see any problem's using a decent filter
     
  15. jmw76

    jmw76 Well-Known Member

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    You are probably right. My observation was that it looked like a standard in line automotive filter. Great if you have a pump pushing the fuel through. Anyway, I still stand by my statement that you do not need one!!! The gauze filter in the tank is enough to stop major dirt getting into the carbs.
     
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  16. Joker

    Joker See "about me" for contact details. Contributing Member

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    Peter mate, couldn't agree with you more. Refreshing to hear this sort of insight in a world of "you must balance the carbies!" as the default "go to" for every problem.

    I have planned another toolbox night but I don't think it will go down until I sort out a few challenges I am dealing with at the moment. We might see one in September in the Mooroolbark area as that's where my big shed is :)

    Glad it's running again - if you had to clean the plugs it might be running a bit rich. I don't know CBR carbies but I suspect a 1/4 turn in on the pilot screws might prevent some of that continuing. Others with the same bike could probably help, or jump onto our facebook group (club250cc riders) and ask there. Heaps of guys with CBR's that could probably help.
     
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  17. talstails

    talstails Member

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    Hey @Joker .. thanks.. I'm a part of that group.. hopefully some nice dudes on there can help me out in the future.. I wouldn't mind taking my inline fuel filter out.. but I'm waiting to get an 8mm 5/16 inch fuel hose.. my mate was supposed to get me a piece but that fell through and was too lazy and said 3/8 inch would do.. but I was like.. not good thanks.. it will be too big!

    So hopefully once I source out a piece of that.. some nice guy in Melb from that facebook group might put his hand up to help me? I dunno.. I haven't had much luck lately trying to score help online! ehehe All the other groups keep telling me to take it to a bike mechanic.. I can't afford to pay an arm and a leg to do a small job :( Plus I want to learn and be taught a few things from some patient people.

    @Frankster cheers for the welcome mate!

    @jmw76 Peter.. thanks for the info and insight.. FTG.. cool.. I'm in Carnegie if you know where that is hehe Do you do work on your bike all by yourself? I am keen to take it out once I score some fuel hose the right size and can score some help too to do it :p hehe
     
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  18. Joker

    Joker See "about me" for contact details. Contributing Member

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    OK well we all have to start somewhere... this forum was my starting place and that's probably the same for a few others. My advice is to start tearing it down yourself, post up photos here and you'll get the help you need and you'll learn. It will take longer than going to a mechanic but the trade off is time vs cost.

    I'm in Mooroolbark, if you join the club ($20/year) you'll get access to our toolbox evenings although one won't be scheduled for several more weeks (they're normally at my house and I am unable to hold one at the moment).

    Free labour is very hard to find - if you want someone in person try offering up a carton although that won't necessarily guarantee you get the right help...
     
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  19. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    You can buy 8mm / 5/16" fuel hose at supercheap, they sell it by the metre for about $10 ?, but they'll sell you 500mm if you want it.
    And buy a pair of clamp's to suit if you don't have any good one's
     
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  20. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    They also sell radiator hoses (different sizes) by the metre. As stated, make sure you get the right clamps for the job.

    @talstails I'm in Oakleigh South. My wife and I eat in Carnegie whenever we're bored with Greek food. Aunties Dumplings is a fav.

    Frank
     
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