Mikuni hsr 42 tuning
#11
I've checked compression and I have 151 psi on front, 149psi on rear. The bike starts well, has good power off the line, and at speed. Plugs look good.
I'm at a loss. The symptoms seem to have been gradual over the last 5-8 thousand miles. I recently had the timing chain replaced too. Sprockets were checked and verified OK. Not sure where to look next.
#12
Here is a link to an article written by Joe Minton. He wrote the book on the HSR carb... literally. He wrote the tuning guide (which is available in PDF format on Mikuni's website.)
http://www.americanrider.com/output.cfm?id=1581175
He states that the carbs come a bit rich. He recommends a 17.5 idle jet, a #98 needle (which is slightly leaner than the 97), and a #50 accelerator pump. He says the stock main jet is usually correct (160 I believe?). There is a kit that can be purchased from Fox Distrubuting. I believe the number is in the article. I just ordered the kit from them a while back and they were really great to work with. The person I spoke to really understood the Mik carb as well.
http://www.americanrider.com/output.cfm?id=1581175
He states that the carbs come a bit rich. He recommends a 17.5 idle jet, a #98 needle (which is slightly leaner than the 97), and a #50 accelerator pump. He says the stock main jet is usually correct (160 I believe?). There is a kit that can be purchased from Fox Distrubuting. I believe the number is in the article. I just ordered the kit from them a while back and they were really great to work with. The person I spoke to really understood the Mik carb as well.
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03-30-2008 04:45 PM