Athena 170cc questions
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@declan said in Athena 170cc questions:
@irongamer727 sorry I know you are asking important questions but did you just refer to your bike as a “him”
Haha haha! Careful, this day and age your bike should be "gender neutral", don't force sexuality on your bike, let it choose or you are going to be on Jeremy Kyle!
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Read my question again. I'm going to jet it. I know 90% of people use either a 270 or 280 main jet. My plan is to adjust the needle. (As rich as possible) and put a 290 jet in to begin with. But I presume 290 will be to big. It's just to be on the safe side. The tricky part is that I cannot just rev him and see if 290 is to big right? Not until the cylinder has done about 500 km. So either I drive the first 500km with a way to big jet and risk destroying the spark plug and stuff due to the co2 build up. Or I try reving him early to adjust him before the 500 km. That's the dilemma.
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Yeah I read it.
Did Athena not provide the correct jettings with the Cylinder kit. That is my gribe.
How could they develop a kit and then not recommend some jettings for it lol.
If we're talking all honesty here.
Get her running sweet on idle, not in gear (you can rev the nuts off it and it won't damage anything provided there is oil) and just make sure it's all good.
Then run her in gently, then sort the jetting out on WOT using the described plug chop methd.
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Allright. I agree. Jets should be accompanied with the kit. Another question. After i fitted the kit. If "the bike" starts with no problems. Should I worry about the idle mixture? Or just keep going? Don't won't it to break down due to a lean idle mixture. Is that even possible?
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@irongamer727 If the bike idles happily, and you pulling the throttle doesn't cause hesitance or bog, then the idle mixture is correct. I can't see the idle mixture increasing massively, but definitely should need to be notched up slightly.
For the running in period, you shouldn't actually need to up the main jet, as you should be hitting WOT. But I'd rather have it and not need it, than need it and not have it.
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@calum The bike is running a bit lean with stock pipe so I will definitely change main jet and adjust the needle. Too bad the needle only has 3 positions.
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@irongamer727 Well needles are readily available.
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@calum any recommendations? Stock mikuni 28 dt125x 2005
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@irongamer727 Yeah I'd recommend jetting it to suit.
I don't run that carb, the only experience I had with the Athena was when my brother ran it on his DTR and he ended up with a vastly too big 38mm Kehin Carb
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@calum so you don't think I need to adjust the needle that much? Rather finding a good jet?
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@irongamer727 As said, it'll definitely need jetting accordingly, but it shouldn't be too far away with what you got.
Start with the idle, and work you way to part throttle, then once it's run it, sort out the full throttle.
But the stock jet shouldn't lean out the engine when running under part throttle.
The needle and pilot jets will affect this IIRC.
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@calum thing is. I'm most of the time driving around 1/2 -3/4 throttle. Not using WOT that much. And he is not running perfectly. Bogging a bit around 80 km/h. Definitely not due to an overrich mixture. The plug is, as I mentioned, still a bit too white. Previous owner did probably drill the main jet since it says 75 rather then the stock 210. I have now at my disposal proper Yamaha (mikuni) jets 260-290. Definitely needs new jets. Needle is set in the stock position in the middle.
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@irongamer727 Drilling jets is a big no no. Never understood that myself.
Yeah I used to get this on my bike lol, always had to blip the throttle a few times to chuck fresh fuel/air into the cylinder.
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@calum Annoying as hell. That must be due to the jet right?
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@irongamer727 Ah well, sorry it ran sweet, but my vapor gauge showed a huge spike in temperature lol.
Yeah it sounds like it's not jetted, or something else.
It's all vague and really would need to feel it to understand the probnlem
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Just upping a main jet doesn't solve everything. There's more to it than that.
What other modifications have you got.
Condition of engine..
Did you fit the kit.
Was it brand new?
Was it running well before the kit was installed.
What exhaust.
What carb?
Powervalve set up and working?
