The pursuit for a brown sparkplug
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It's not really appropriate to be judging the fueling on break in, you need to put that engine under load and perform a plug chop to really understand how the fueling is doing.
Once it's bedded in, perform a plug chop and report back what the plug is doing then.
I'd say that plug looks a tad lean to me.
Easiest way to tell is to restrict the air flow into the bike, if it performs better then you know you need to increase the fueling.
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This is mine (no kit though), a bit of deposits from excess oil, but otherwise tan as Hasselhoff!!
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Wow! I'm impressed! I'm now running 290 main jet. Can't feel much difference. My issue is, it does not pull after 3/4 throttle. The revs go up, exhaust getting louder, I brace for the real powerband but then nothing.. Dropping to 3/4 and she goes! But there is definitely power left to scavenge. My next alternative is to try a 270 main jet. And yes I've tried the choke, no results.
Should I really be giving the piston, cylinder full throttle? I'm closing in to 300km.. Shouldn't be an issue right? -
This post is deleted!
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I've tweaked the oil pump a bit for my Athena, will this dramatically lean the mixture? As I've said, I'm running far bigger jets than anyone I've seen used the big bore kits.
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@irongamer727 What is your bike not doing?
I dont get it.
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And I have a friend running 240 with the kit. We are both running stock Air box and so forth.
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@calum yep there is a powerjet. I'll give the really big jets a try first. Because again, I've not heard anyone changing anything but the main jet.
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@irongamer727 So the powerjet kicks in at wide open throttle.
You should be doing a plug chop at WOT.
Therefore, changing the main jet won't affect the colour of the plug during a plug chop.
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The Powerjet is a fixed system on the TM28,
I used to run 340 Main, 30 Pilot, only because of extensivly modifing the Airbox volume,
And, it was rubbish mostly.
I had to replace my main body Carburettor gaskets because of symptoms near enough the same as you.
I would recomend throughly checking for Air leaks as this is almost certainly your problem!
Dont just throw fuel at this and hope for results.
Work backwards.
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I do have the entire pice where the snorkel existed cut out. So there that as well.
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@irongamer727 You donkey,
Why dont you try and restrict Air by patching up a section of the Airbox,
By doing so, i’ll bet a Roast dinner that it sorts out your lean condition.
I’ve played around alot with this, you’ll stuggle to fuel this properly with the TM28
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@darty there isn't a good way of doing it, patching the Air box up I mean. In theory, I'll just get a slightly higher fuel consumption than "everyone else". From what I've understood the airbox is quite restrictive.
