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XS1100H TIMING


Born2Restore
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HELP!

Just installed a new set of mikuni RS racing carbs onto my 1981H xs1100 and the bike is back firing through the carbs. A recent restore and never heard the bike run, but it turns over well. I've checked the timing chain tensioner and it appears to be fine. I also opened up the case and accessed the timing mechanism and it doesn't look like either diagram in the OEM service manual. It doesn't have an F designation on the timing plate or the timing degree hash marks. It has a T and a C on the plate and a 4R0-10 designation stamped on the plate. Does anyone know how this is suppose to be timed? This bike was abandoned in a barn for 14 years and I've worked the past year and would really like to hear it run. The racing carbs were $1100 so any help would be greatly appreciated.

Thank you in advance,

Kevin

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HELP!

Just installed a new set of mikuni RS racing carbs onto my 1981H xs1100 and the bike is back firing through the carbs. A recent restore and never heard the bike run, but it turns over well. I've checked the timing chain tensioner and it appears to be fine. I also opened up the case and accessed the timing mechanism and it doesn't look like either diagram in the OEM service manual. It doesn't have an F designation on the timing plate or the timing degree hash marks. It has a T and a C on the plate and a 4R0-10 designation stamped on the plate. Does anyone know how this is suppose to be timed? This bike was abandoned in a barn for 14 years and I've worked the past year and would really like to hear it run. The racing carbs were $1100 so any help would be greatly appreciated.

Thank you in advance,

Kevin

:welcome: kevin

you sure those carbs are correctly jetted for the bike?

too rich or lean can have the same effect your describing

standard jetting is;

1981 SH/LH mains=110(1&4)& 120(2&3) pilot=42.5 start jet=25 main air=140 pilot air=185 throttle valve=135 on a Mikuni BS34-II

if you don't get many replies i can direct you to http://www.xs11.com/forum/ as they are the specialists for the marque

cheers

drewps

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