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Post by andrikink on Apr 14, 2014 15:01:08 GMT -5
Hey! I have a problem with my Dellorto 19mm carb, it has 92 main jet. when im riding with fully opened throttle at high rpms then my ride is sputtering ang stuttering, but thats another problem with spark plug and plug pipe (kind of missfires). but when im riding about 70-80 km/h (dont know how many mp/h's) then with fully opened throttle it kind of screams loud but not making so much power. when riding about 1/4 opened throttle or maybe half then it speeds up (because spark plug problem it missfires). dont know if i must change pilot jet, because i have aftermarket air filter, not in a box. tried to change the needle position too but no good differences from there. hope you understand  thanks! |
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Post by 2TDave on Apr 14, 2014 15:05:25 GMT -5
With an open air filter you are probably lean. Try a 100 main jet. What is the problem with the spark plug? That will need fixing first. What cylinder are you running?
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Post by andrikink on Apr 14, 2014 15:20:00 GMT -5
spark plug is bit old and plug gap (pipe) makes it missfires somehow.
cylinder is malossi sport 70
and i dont think im having big main jet, tried bigger before and 92 kinda fits the best, but the other jets i think causing this, but i dont have any clue what should i replace
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Post by 2TDave on Apr 14, 2014 15:38:01 GMT -5
Get a new plug and if your running an open air filter get a 100 main. I run a 102 and others run still larger. The other jets have nothing to do with wide open throttle. Run it with the larger jet and check the plug. Or put the stock air box on.
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Post by andrikink on Apr 14, 2014 15:48:45 GMT -5
maybe i try bigger main jet but if im not able to get idling good, what should i do?
main jet cant be too small, because if it is then its bogging badly, isnt it?
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Post by 2stroked on Apr 14, 2014 19:12:28 GMT -5
If your main is too small your engine will run lean. It may sound fine and feel fine, but it will not make the right power, and it could soft sieze, or worse. I had a similar problem on my scoot with a Polini sport 70bbk, it would idle fine and make power down low, but at wide open throttle(wot) it would bog, and or die. Personaly, a 92 sounds too small, with a bbk and an open filter. Try a 97-102, it should be better, at leadt a 95.
Get a new plug, as soon as you can, gap it correctly, and do a plug chop, bet its lean.
Oh, as a side note what are your cvt wieghts?
Good luck
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Post by andrikink on Apr 15, 2014 2:55:11 GMT -5
Got new plug and plug cap. Still sputtering. Bet its lean and detonating. My weights are 6(point)3 grams
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Post by oldgeek on Apr 15, 2014 3:19:25 GMT -5
Put the stock airbox back on. The open filter will also ruin your fuel economy.
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Post by 2stroked on Apr 15, 2014 7:46:49 GMT -5
Agreed. If u still have your stock air box
try swapping it, and see what happens.
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Post by andrikink on Apr 15, 2014 10:31:33 GMT -5
I have original box but there are holes in it so i dont think that its good. Getting new one maybe. But if im putting on stock box then which size main jet i must put?
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Post by 2TDave on Apr 15, 2014 13:03:22 GMT -5
Try the 92 you can also try the box you have and tape the holes. If it's rich remove some tape. As long as the air is still flowing through the element.
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Post by andrikink on Apr 15, 2014 13:16:36 GMT -5
Suppose i put a completely new airbox with filter, then what main jet i am looking for? 80 to 85?
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Post by 2TDave on Apr 15, 2014 14:56:32 GMT -5
My guess is 85 to 90 but these things are all different. You should have an assortment of jets for tuning and modding. I keep 80-110.
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Post by 2stroked on Apr 15, 2014 15:54:46 GMT -5
I run an 85 main with a polini 70 with stock exhaust,intake and 16(ormaybe?18) mikuni.
Until u get the tuning jets, reinstall your air box and tune the air box to your set up by adding/removing tape. Not a long term fix, but it gets you back on two wheels.
Try that & get back to us.
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Post by andrikink on Apr 15, 2014 17:05:22 GMT -5
i try new jets and new airbox from friend, mine with holes is pretty dirty and in bad shape, two halves of the box need some gasket or something, the edges are in pretty bad shape. i get back to you guys when i have some news  |
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