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Post by pigboy on Mar 10, 2021 14:01:40 GMT 1
Hi has anyone got a good write up on how to set up the ypvs system , the engine is out so I don’t have any electrics . I’m guessing both exhaust valves should always be in the same position , I have one fully open and one slightly closed , is it possible to put them in wrong way round .
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Post by midlifecrisisrd on Mar 10, 2021 14:22:28 GMT 1
If they are misaligned then either the valves or worn on the ends or the joining piece is knackered
There is a flat on the end of the valve so is either joined or not. You can't have one one way and one the other without being knackered
Steve
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Post by pigboy on Mar 10, 2021 15:43:35 GMT 1
Just wondered if one was meant for the left and one for the right , if they could be fitted wrong
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Post by tacky1 on Mar 10, 2021 15:46:25 GMT 1
The valves are both connected in the middle by a linkage and a pulley for the YPVS cable, You can adjust the PV openings and alignment at the pulley, There are 2 screws on the side, open them and you can rotate the valves and align them, Slide 2 bolts or drill bits into the alignment holes on the sides of the barrels and set the valves or do it by eye, tighten up and you are good to go
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Post by tacky1 on Mar 10, 2021 15:51:30 GMT 1
Plus, when rebuilding, I never use the crank timing in the manual,
This is from the Yamaha race settings for the 500.
Engine is a lot smoother, less bar buzz.
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Post by pigboy on Mar 10, 2021 16:26:11 GMT 1
Well I’ve jjust taken the two power valves out and swapped them over and it aligns perfectly, one has two number 1s on the other gas two no2s on , no mention of this in manual
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