That wont change a thing at idle. That only limits how far they open. I.e. Max fuel delivery position. At idle the rack is barely cracked open. I vaguely recall another Guy with this issue on here, maybe a search? I believe the timing needs to be different than an R due to the piston design & different compression you have now. Renaissance Tractor has done these I believe, maybe ask him too. I will soon need to do this to mine so let me know how you end up. :-)
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