dnseal
CapnGil
Hello all, new to the site, but reviewed enough to see that there is a boat load of valuable data here, so thanks and a "atta boy" to you all. My son and I just bought two xs400's, a 1977 for him and a 1981 for myself. Plan was cafe build and that may occur later but for now simple mods and ride. Both bikes are in excellent condition, in fact they are so nice its why were not chopping (back seat area) them up to make true cafe's.
I was looking around and found two advertised hp ratings for these bikes... 38 and 27, depending on which site you look at. It's not really important how much power they make as these are not intended for hold on speeds, but it would be nice to know how much hp they (77 and 81) have. Being that compression is about 115 lbs on the 77 it's also not worth the investment of carb and exhaust upgrades yet. Which leads me to my next question; would a simple re-jetting kit and free flow exhaust make a notable difference on a 140lb compression engine? Of course the best thing to do is rebuild upper half and get compression back close to specs and then do mods later, but riding for a while learning bike and creating a plan is immediate and most productive plan.
Be Safe
Gil
I was looking around and found two advertised hp ratings for these bikes... 38 and 27, depending on which site you look at. It's not really important how much power they make as these are not intended for hold on speeds, but it would be nice to know how much hp they (77 and 81) have. Being that compression is about 115 lbs on the 77 it's also not worth the investment of carb and exhaust upgrades yet. Which leads me to my next question; would a simple re-jetting kit and free flow exhaust make a notable difference on a 140lb compression engine? Of course the best thing to do is rebuild upper half and get compression back close to specs and then do mods later, but riding for a while learning bike and creating a plan is immediate and most productive plan.
Be Safe
Gil