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Post by chris79 on Aug 25, 2019 6:06:18 GMT -5
Hi I have a Yamaha jog which I have changed the exhaust and took the snorkel off air box and changed jet size a tiny bit. And now when on full throttle it seems to make a pinking sound and won’t get to top speed. Any idea what I’ve done wrong thanks.
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Post by aeroxbud on Aug 25, 2019 6:11:07 GMT -5
As a guess you might need to go bigger on the main jet.
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Post by chris79 on Aug 25, 2019 6:38:29 GMT -5
As a guess you might need to go bigger on the main jet. cheers mate I was going to go up another size as it did seem to be running low on fuel. |
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Post by FrankenMech on Aug 25, 2019 10:37:18 GMT -5
Hi I have a Yamaha jog which I have changed the exhaust and took the snorkel off air box and changed jet size a tiny bit. And now when on full throttle it seems to make a pinking sound and won’t get to top speed. Any idea what I’ve done wrong thanks. That sound is your engine trying to destroy itself. |
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Post by christopher on Aug 25, 2019 12:00:00 GMT -5
How much is a tiny bit? When I opened up the air box on my 2 stroke, I went up 10% as a starting point and I'm not running rich yet. Better to foul out a plug running rich then destroy your motor running lean.
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Post by chris79 on Aug 26, 2019 3:32:57 GMT -5
How much is a tiny bit? When I opened up the air box on my 2 stroke, I went up 10% as a starting point and I'm not running rich yet. Better to foul out a plug running rich then destroy your motor running lean. it had a 70 jet in it and I just went up to 80. |
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Post by christopher on Aug 26, 2019 5:31:19 GMT -5
Did you try putting the snorkel back in and see what happens. That should make it run richer if you are running lean.
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Post by chris79 on Aug 26, 2019 20:20:22 GMT -5
Did you try putting the snorkel back in and see what happens. That should make it run richer if you are running lean. that was the plan but I seem to have miss placed it so going to try another air box see if that helps. |
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Post by christopher on Aug 27, 2019 5:39:53 GMT -5
Put tape over part of the hole.
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Post by 90GTVert on Aug 27, 2019 8:47:59 GMT -5
Try different jets and see what happens. Do some tuning passes and record data with each to find out what jet works best.
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