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Author Topic: poor performance  (Read 3150 times)

biggazmo

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Re: poor performance
« Reply #15 on: July 10, 2012, 06:27:08 PM »
Put my 85 jet back in . stock was 80 . Will give it a try if the rain ever stops while i wait the year for my springs to arrive
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mono

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Re: poor performance
« Reply #16 on: July 10, 2012, 07:36:55 PM »
Quote
Would an oversized jet affect acceleration ?

A few sizes up from the perfect jet (e.g. from 90 to 94 in my case) will change a fast and responsive scoot to a lifeless and boring ride...

But beware : a few sizes down from perfect will change the same scoot into a short lived piston-eater  ;D

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Peters

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Re: poor performance
« Reply #17 on: July 10, 2012, 07:48:14 PM »
Quote from: biggazmo on July 09, 2012, 09:36:24 PM
Would an oversized jet affect acceleration ?

Absolutely

Work your way down one size at a time. Jumping around can be confusing.

You can run rich for years and do no damage. Run it for a few weeks one or two sizes too small(lean) and oops, there goes the piston.
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streido

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Re: poor performance
« Reply #18 on: July 10, 2012, 08:09:44 PM »
Quote from: Peters on July 10, 2012, 07:48:14 PM
Absolutely

Work your way down one size at a time. Jumping around can be confusing.

You can run rich for years and do no damage. Run it for a few weeks one or two sizes too small(lean) and oops, there goes the piston.

Never had a piston go on me, yet, what happens when it goes? Does the engine just seize up and stop?

Hopefully i never experience it, just wondered what the worse case scenario is tho? Is the engine normally repairable with a new piston or not if it does happen?

Got me worried now since im sure i was running lean for a few weeks after i fitted a Leo Vince, upjetted last weekend anyway and all still seems good so im hoping it hasnt done any damage.
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Peters

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Re: poor performance
« Reply #19 on: July 10, 2012, 11:47:27 PM »
4 strokes are much less sensitive to running lean. The enemy here is heat. 2 strokes need the fuel/oil for cooling as well as lubrication. 4 strokes do too, just not as much. Not matter what condition the fuel mix is, there is always oil pumping through the engine.

Most of the time the rings shatter and score the cylinder and you immediately loose all compression. That's the best case scenario.

What's the worst that can happen?
A chunk of piston falls down into the crankcase and wedges itself somewhere it should never be. The crankcase gets cracked and that's it. The entire engine is done.
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zombie

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Re: poor performance
« Reply #20 on: July 11, 2012, 12:24:04 AM »
YUP!
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wordslinger

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Re: poor performance
« Reply #21 on: July 11, 2012, 03:11:41 AM »
+1 YUP
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streido

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Re: poor performance
« Reply #22 on: July 11, 2012, 09:38:48 AM »
Well like i said i think im ok and it seems fine, just wondered.

If the worst case scenario happened i have peoples who can get me a spare low miles stock engine for under £100 so its no biggie.
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Peters

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Re: poor performance
« Reply #23 on: July 11, 2012, 10:00:52 AM »
Quote from: streido on July 11, 2012, 09:38:48 AM
Well like i said i think im ok and it seems fine, just wondered.

If the worst case scenario happened i have peoples who can get me a spare low miles stock engine for under £100 so its no biggie.

That's good

I see those A50s all the time
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