'63 r60 losing power after warmed up

[Ziggy]

No filters in fuel lines.

[Ziggy]

Would a dirty petcock filter cause power loss after 10 miles? Will definitely check.

[chrishea]

Losing power like stalls and dies or keeps running? Good carb gaskets at the head and the bolts holding the carbs to the head are tight? Warped carb flanges?

[Ziggy]

Doesn't stall, just doesn't want to power above the higher end of 2nd or 3rd, does not pick up speed/power

[jwonder]

Would a dirty petcock filter cause power loss after 10 miles? Will definitely check.

Yes, it would.

[Ziggy]

Will check that for sure. It would be great if that is what is causing the power loss once the bike is warmed up. Appreciate the feedback and this forum for sure.

[312Icarus]

Do you have an air cleaner choke? Make sure it is fully open. I second fuel filters, but might lean toward condenser. Icarus

[jwonder]

Losing power like stalls and dies or keeps running? Good carb gaskets at the head and the bolts holding the carbs to the head are tight? Warped carb flanges?

Chrishea, typically warped flanges would make for a high idle when warm because it would be sucking air in the flange. I have had this problem! I did not see that as one of his complaints, but if it is then you might be correct!

I have seen this as almost an uncontrollable idle when hot, it just revs because its sucking the air in through the flanges.

[jwonder]

New to forum. Power loss consistent after bike warms up - 12 to 15 miles of riding. Recently cleaned magneto, installed new coil, points, condenser (from Vech, who has been great.) Properly set gaps, timed ignition. Also changed rings on one cylinder with low compression. New plugs, good spark. Starts on one kick cold. Bike will re-start if left to cool some, but exhibits pretty immediate power loss when up to temperature. Bad coil? Condenser? Both? Any way to test either?

Ziggy, going back to what you said in your paragraph. You said it starts 1 kick when cold but it needs to cool down to re-start. THAT sounds like the coil is not good but you said you just got a new one from Vech. I would call him and tell him that and tell him it has no power when hot. Also tell him all the other items you checked (fuel filters, etc) and let him tell you what it might be. Sounds like a weak coil but its hard to believe because you got a new one. Does it start hot if you jump start it? If so, that really sounds like a coil problem!

[Ziggy]

I have not jump started the bike when hot, but was considering calling Vech about the new coil after checking the flanges and doing a solid leakdown test. However, not mentioned intitially, 2 rides ago the bike DID rev fairly uncontrollably at about the same point of losing power, so your point about the flanges causing this symptom is very helpful, along with everyone else's check points.