Speedfight 2 100cc issues

glowwormer · Derestricted Danger Joined: 01 Feb 2013 Karma :

Evening everyone, I hope you can help. My speedfight 2 has been playing up since November. I was happily commuting home from work one night and about 10 miles in when the throttle just died bike ticked over til I pulled up then cut out. It took me about 5mins to start another 5 miles same thing happened. This time I used the kickstart to fire it up and it sounded like a really loud pop spluttered then started on the 2nd kick. This happened again on the following day so I thought hell ill try a new spark plug hey presto perfect til last week same symtons almost sounds like it's farting when you open the throttle changed spark plug perfect again but symtons started again tonight 3days after spark plug change. Both plugs have heavily carbon tips spark is fine I've had the carb off and used some stp carbon spray on it tonight ticks over fine but not taken it for a spin yet. I'm pretty savvy being a gas engineer but I'm no mechanic any help very much appreciated! Cheers andy

at106 · Brolly Dolly Joined: 16 Jul 2011 Karma :

If there is lots of carbon on the spark plug the bike is running rich. How long had you owned it before the problems first occurred? I would make sure the air filter is clean and dry.

adam bike docor · L Plate Warrior Joined: 02 Feb 2013 Karma :

check the reed petals are not broken thats a common fault with the speedfights be it a 50 or 100 cc.if you look at the carb you will see it fits onto a aluminium manifold take the four bolts out that hold that on and the petals are underneath it if they ahve any damage replace them with new ones.you can buy aftermarket ones made from carbon that you cut to size these are pretty good.

Copycat73 · World Chat Champion Joined: 11 Jan 2013 Karma :

who did you buy the spark plugs off ?
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glowwormer · Derestricted Danger Joined: 01 Feb 2013 Karma :

Hi all thanks for all the replies. Spark plugs are ngk's br8es from my local garage. Yeah really black at tip, so I guess your right and she's running rich. Just been on a tootle around the country lanes round me and she seems fine again. Had the filter out feels moist but not wet. There are two screws on the carb big one with a spring I can adjust with my fingers and I pilot screw (fuel mix?) which I have wound in clockwise and back out 1 3/4 turns which I'm told is factory set. As for the big screw and spring I guess that's the idle speed? As for the reed plates I guess I have to remove the engine cover to get at all four bolts of the intake? Would I be right in saying loss of compression would happen all the time and make no difference with a new plug? Again thanks for all the replies. Andy

alains · World Chat Champion Joined: 08 Jul 2004 Karma :

uses BR8EIX
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glowwormer · Derestricted Danger Joined: 01 Feb 2013 Karma :

Thanks is that the correct one for the 2000 model? I asked the local garage to check as the Haynes manual I have says it's the one I stated above local garage checked and confirmed that but if that's it that would makes some sense but not why she's running rich. Be fine again since Sundays coming home tonight problem started again bloody thing! Looks like it's a trip into the garage let an expert take a look

glowwormer · Derestricted Danger Joined: 01 Feb 2013 Karma :

ok so im the first admit I gave up lol. Bike has been at the garage a week now! new ht lead, exhaust cleaned out another new spark plug and there still struggling to get it to run right. ill keep you posted.

Copycat73 · World Chat Champion Joined: 11 Jan 2013 Karma :

is it fitted with an automatic choke, could this be stickin ? Question

tried a hotter running spark plug ? Question

long shot but....
some times sprayin wd-40 on the engine electrics connectors,etc. helps.
____________________
Whatever I post I have no citation and no intention of providing one..
caveat emptor

glowwormer · Derestricted Danger Joined: 01 Feb 2013 Karma :

Had the bike back one day. Bill came to 166 notes plus i supplied a makau ht lead at 20. 4 hours labour with 2 spent burning the deposits out of the exhaust. the bike actually sounds like a 2 stroke now so can understand why they did it. but....... on my way to the lock up this morning, bike cut out, massive back fire and now wont start. only new thing i noticed this morning is the throttle seemed to be sticking. With the so called experts having it a week and with a bill near 200 it certainly not going back. What i have found this morning is the carb top has worked loose (screw missing) and the slide does not move up and down smoothly this must be why it wont start. would any one agree that i need to strip and fully clean the carb? replace the seals, could it be that simple?

glowwormer · Derestricted Danger Joined: 01 Feb 2013 Karma :

glowwormer · Derestricted Danger Joined: 01 Feb 2013 Karma :

I have had the carb of tonight and cleaned all the jets reset the pilot screw again and ordered the missing screw. I have a question and hope someone can help the needle was very slightly bent the spring clip was 2nd from bottom and the Haynes manual says 2nd from top so I've moved it. What effect would this have being in the wrong position??.

glowwormer · Derestricted Danger Joined: 01 Feb 2013 Karma :

Couple of hours drive this afternoon some nice fish n chips at a local bike haven all seems to be good on my little commuter. Thanks for everyone's advice.

andyscooter · World Chat Champion Joined: 30 May 2009 Karma :

if the needle has been messed with it may of been a failed atempt by someone to deristrict the scoot

yes i know its a 100cc and not ristricted anyway

the needle being slightly bent wont help either
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