Anyone able to shed some light on this one as it’s doing my head in?
Stock 1999 Busa with 4/1 exhaust system, was running fine until I took it off the road 3 years ago.
Have just put it back on the road: whole new front braking system and I’ve binned the PAIR, capped the pipes and ports.
Didn’t burp the cooling system when I put the rad back on, so it overheated a mile from home on a test ride.
Got called a fair few names, told to burp it. Burped it, filled rad and reservoir (latter to half way between L and F). Rocked bike, squeezed pipes a few times, saw bubbles, topped up. Let stand, topped up (50/50 water / concentrate).
Went for a spin, seemed better. 5 miles later I pulled up at some lights and the temp needle started rising fast, straight into red. Killed engine, but it kept rising until the temp warning light came on.
Shat myself, let cool, limped home. Get back and the reservoir is bubbling like a volcano, spewed coolant all over, emptied bottle.
Noticed that fan doesn’t come on until the temp needle hits red, so installed a manual switch. Went out for 5 miles with the fan on constantly and, as soon as I got back and killed the engine, the reservoir starts bubbling and pukes half of the bottle.
Went out today, refilled system and left rad cap off, then fired it up. Within 5 mins the temp was at 2/3. Killed engine, let sit for 30 mins, turned on power and temp needle immediately goes into red without starting engine.
Left it an hour, came back, needle did the same, fires it up, needle dropped, then after 10 mins it overheats and the reservoir is bubbling like a witch’s cauldron.
The rad cap is blistered, it has been ever since I got it, see pic, but is this sufficient to cause the problems I’m seeing?
Have I missed something after the PAIR valve mod?
Stock 1999 Busa with 4/1 exhaust system, was running fine until I took it off the road 3 years ago.
Have just put it back on the road: whole new front braking system and I’ve binned the PAIR, capped the pipes and ports.
Didn’t burp the cooling system when I put the rad back on, so it overheated a mile from home on a test ride.
Got called a fair few names, told to burp it. Burped it, filled rad and reservoir (latter to half way between L and F). Rocked bike, squeezed pipes a few times, saw bubbles, topped up. Let stand, topped up (50/50 water / concentrate).
Went for a spin, seemed better. 5 miles later I pulled up at some lights and the temp needle started rising fast, straight into red. Killed engine, but it kept rising until the temp warning light came on.
Shat myself, let cool, limped home. Get back and the reservoir is bubbling like a volcano, spewed coolant all over, emptied bottle.
Noticed that fan doesn’t come on until the temp needle hits red, so installed a manual switch. Went out for 5 miles with the fan on constantly and, as soon as I got back and killed the engine, the reservoir starts bubbling and pukes half of the bottle.
Went out today, refilled system and left rad cap off, then fired it up. Within 5 mins the temp was at 2/3. Killed engine, let sit for 30 mins, turned on power and temp needle immediately goes into red without starting engine.
Left it an hour, came back, needle did the same, fires it up, needle dropped, then after 10 mins it overheats and the reservoir is bubbling like a witch’s cauldron.
The rad cap is blistered, it has been ever since I got it, see pic, but is this sufficient to cause the problems I’m seeing?
Have I missed something after the PAIR valve mod?