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Post by gordong65 on Sept 10, 2019 22:06:46 GMT 1
Long story short , went to squires on Saturday with mate on his ypvs and me on Rd350, bike ran great all day, went out on Sunday and bike starts miss firing and won't rev past 3k , left hand cylinder exhaust is cold , changed coils same issue any ideas ,ignition ?
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Post by tacky1 on Sept 11, 2019 7:00:19 GMT 1
Try a new plug first or swap the plugs from one cylinder to the other and see if it still misfires on the same one
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Post by earthman on Sept 11, 2019 7:40:52 GMT 1
+1 on trying a new plug first.
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Post by gordong65 on Sept 11, 2019 11:47:18 GMT 1
Should have mentioned done a plug swap at the time but still the same
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Post by earthman on Sept 11, 2019 13:43:37 GMT 1
How about the plug cap/connection, is that sound?
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Post by gordong65 on Sept 25, 2019 20:01:14 GMT 1
So far I've changed plugs / caps coils , stripped LH carb checked jets, floats etc all good but it's still cold on left cylinder with a small amount of white smoke from exhaust ?
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Post by earthman on Sept 25, 2019 20:36:39 GMT 1
What about the coolant, have you noticed a drop in the level for example?
Pure guess, wondering if water is getting into the left cylinder??
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Post by gordong65 on Sept 25, 2019 20:42:40 GMT 1
What about the coolant, have you noticed a drop in the level for example? Pure guess, wondering if water is getting into the left cylinder?? Checked the level and it did seem a little low , Head gasket gone |
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Post by midlifecrisisrd on Sept 25, 2019 20:50:53 GMT 1
Id be doing a compression check to rule out cylinder damage
Also check all the reed petals are still in place
Steve
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Post by gordong65 on Sept 25, 2019 21:00:25 GMT 1
Pulled the reeds and they were good , standby for comp check ,, cheers guys
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Post by gordong65 on Sept 29, 2019 19:36:57 GMT 1
Compression test 110 so I'm stumped
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Post by midlifecrisisrd on Sept 29, 2019 19:57:56 GMT 1
Have you tried the left plug cap on the right and right on the left?
Next check would be a leak down test
Steve
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allan
L plate rider.
Posts: 19
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Post by allan on Sept 30, 2019 13:50:33 GMT 1
hello, its almost certainly carb related. i would take the left carb off, thoroughly clean with carb cleaner aerosol, then, and this is the important bit, use compressed air line or air duster to finish blasting out the passages, especially the air screw/idle air passageway. this was the difference between running on one cylinder and running on 2 on my RD350 YPVS. just using carb cleaner, there will be residual fluid in the air passage that will not be cleared via engine suction alone, it MUST be blasted through with compressed air. hope this helps.
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Post by Tobyjugs on Sept 30, 2019 18:28:13 GMT 1
Have you rested the spark plug on the cylinder head and kicked the bike over to see if you have a spark?
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