Portaz13 Posted January 30, 2018 Share Posted January 30, 2018 Hi all again, I've run the old girl (1990 750) for about 500kms now. I've been trying to squeeze a few high rpm runs in and noticed it really doesn't want to rev over an indicated 10500 rpm. Above that it start to sound unclean as in not smooth. I note the Dyna 2000 is set on 14000rpm but it really screaming at 10 and I have too much mechanical sympathy to push it more than that. Assuming the tach is correct is there another setting on my flat slides I should be looking at? Quote Link to comment
Wee Man Posted January 30, 2018 Share Posted January 30, 2018 14k is far too high! Don't know about 750, but redline on an 1100 is 10500. Quote Link to comment
dupersunc Posted January 30, 2018 Share Posted January 30, 2018 750 rev to 12500rpm. Sounds like you need to get the bike on a Dyno. Quote Link to comment
Portaz13 Posted January 30, 2018 Author Share Posted January 30, 2018 Was thinking the same, might just put needles back to how it was, mark my throttle position and see if I can get some more clues Quote Link to comment
Oilyspanner Posted January 30, 2018 Share Posted January 30, 2018 Hi Portaz - the standard tacho is as accurate as an MP's promises at election time ! - they over read badly as the revs increase (eg. over 12000 at close to 11k). If the previous owner has set the rev limiter at a true 14k revs, then hopefully the top-end isn't damaged - I think the 1990 and 1991 750 had 12.5 or 13k rev limits. The power tails off before that anyway, so it's pointless rev too much beyond peak. If the bike is new to you, give it a good service - oil/filter, plugs, valve clearances, carb balance - then hopefully your top-end running probs can be sorted with a main jet swap. A 750L should rev good and true from an indicated 9 - 12k + revs. Giving it a good service will give a good base to work from- good luck ! Quote Link to comment
Portaz13 Posted January 30, 2018 Author Share Posted January 30, 2018 I've been struggling with carb settings as in long previous thread, I'm thinking I will lower rev limit and go through carbs one more time. Its not really a huge issue as I'm not usually that high up in revs. On occasion it's stalling at idle . Thanks for reply guys I Minda felt 10 is a good place to change anyway well indicated 10 god only knows what it actually is lol Quote Link to comment
Portaz13 Posted January 31, 2018 Author Share Posted January 31, 2018 So pulled the carbs and went through them. Went for a run after a warm up period reved to 12, as the run continued with white a few high rpm /speed runs the revs stated to break down again at 10500 and then under 10000, still pulls bloody hard and I spoke to the dyno guy who is happy to run It to see what's going on. I'm leaning towards spark, I also lowered rev limit to 12500, is it possible spark plugs could cause this as it heats up? Quote Link to comment
no class Posted January 31, 2018 Share Posted January 31, 2018 Rods will be in the pan soon enough ..... Quote Link to comment
Madb Posted January 31, 2018 Share Posted January 31, 2018 could be the coils breaking down as the heat builds. dyno run will soon show where to look. nice looking bike. Quote Link to comment
Portaz13 Posted January 31, 2018 Author Share Posted January 31, 2018 6 hours ago, no class said: Rods will be in the pan soon enough ..... What makes you think that? Quote Link to comment
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