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May 23, 2012 21:18:58 GMT
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If you can, I would use the stock airbox from the bike. It's guaranteed to work and I doubt that you would get more power by using anything else.
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If you can, I would use the stock airbox from the bike. It's guaranteed to work and I doubt that you would get more power by using anything else. I agree 100%. When younger I "played" with jets and filter changes but now I'm older realise what a waste of time and money it was as manufactures OE was virtually always the best option. Paul H |
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May 24, 2012 12:10:23 GMT
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You're both right, I know, but not an option now as the original air box was damaged, and I don't have room as I need that graviety fed from tank, and the exhaust is in the way.
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May 24, 2012 14:05:12 GMT
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Go up between 50 and 100 on the main jet, buy a range as they are only cheap, if you explain what you are doing you may find you are able to return the wrong sizes if you ask nicely. K&N used to supply up jetting guides for their cone type filters which you should still be able to find on the net. Better it runs too rich than too lean to start with.
Is there a silencer to go on the end of the expansion pipe? Without it you may find that there is a lot less torque than normal - more noise doesn't always equate to more power with 2 strokes.
Sorry no idea who to go to around Birmingham these days, I would have suggested someone like Steve Goode in Aldridge but he's moved now. An older place that specialises in competition bikes will probably be more likely to have jets etc in stock
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May 24, 2012 14:06:31 GMT
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The other solution is to wrap duct tape around the filter to restrict the airflow through it, you'll need to block off about 2/3rds of it.
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2 Stroke expertsDeleted
@Deleted
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May 24, 2012 21:33:10 GMT
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Ok, not a two stroke expert but have messed around with quite a few.
Back in the day the best way I found to check if the main jet was ok was to pull the choke on at full throttle. If the motor picks up then you are too weak if it splutters then too rich. Not sure if this is feasible on a cart though! It's not a perfect method and I would err on the rich side with a two stroke.
Check your plug as well although modern fuel takes longer to get a good colour.
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May 24, 2012 21:55:50 GMT
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the little 50cc and 125cc 2t respond very well to a free flowing filter and up jet- when I did my dt125 the difference was immense!
was the engine in de-restricted form in the first place? and what bike was it out of, and what year? they got more and more restricted the newer they are, my mx50 from 2004 had a smaller exhaust port opening on the head, which means your wont get as much effect from the filter change. my earlier rs50 (same am6 lump) was a damn site quicker, with the older head, bigger main and filter. try browsing the af1 forum or 125cc sportsbikes .com and see if there is any info on jets in there.
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