tomtom1
Thrash Merchant
Leeds
Posts: 355
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Post by tomtom1 on Feb 28, 2013 18:44:25 GMT 1
Hi fellas i'm usualy over on the lc side of this forum but im doing a rd400e engine for somone, does anyone know what that small hole is for in the exhaust port? iv'e done a lot of two strokes in my time but never seen owt like this, what does it do? does it want opening up/closing up??? cheers
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horace
Thrash Merchant
Posts: 456
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Post by horace on Feb 28, 2013 19:33:58 GMT 1
I was told it was to ease compression on starting when I asked the same question,still not sure though ,I don't worry about it any more it's usually blocked up with carbon anyway after a few k miles.  |
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Post by muttsnuts on Feb 28, 2013 21:16:26 GMT 1
I was told it was to ease compression on starting when I asked the same question,still not sure though ,I don't worry about it any more it's usually blocked up with carbon anyway after a few k miles. that is correct, that is what its for, nothing to worry about...... |
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tomtom1
Thrash Merchant
Leeds
Posts: 355
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Post by tomtom1 on Mar 1, 2013 18:53:44 GMT 1
Right ok fellas just thought id ask as iv'e never seen one on anything else. cheers
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Post by howard on Mar 1, 2013 19:13:37 GMT 1
I thought it was to ease overrun when decelerating , but I've never found much difference blocked or not.
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higgsy
Thrash Merchant
Posts: 458
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Post by higgsy on Mar 11, 2013 10:31:01 GMT 1
Most tuners back in the day used to tap and plug it, Yamaha suggested that it was there to stop the mid range surging that plagues the early 400's. Like Howard said, I don't think it makes a blind bit of difference!
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