Running Hot .

[Iain Cameron]

Guys Im stumped . Ive got the old Yamaha DT1 running for the Nats full rebuild all new parts ( gaskets , seals , ect ) .
She is running very Hot and Im at a loss as to why . Carb has been cleaned and the same jets replaced . no air leaks tested with pressure and spraying start ya bastard over all areas . runs crisp great response .
Could the timing be to advanced ? .
all ideas welcome . Iain .

[Momus]

What ignition system do you have Iain?

[80-85 husky]

try lifting the needle clip to richen her up a tad

[Iain Cameron]

Ive lifted the clip 80-85 husky . Im running a DT400 cdi system Momus . the same system that was in her b4 the rebuild .

[ralph311]

What are you seeing that indicates it's running too hot?

Could the compression be too high? (maybe the new head/base gaskets are thinner than the old ones??)

[Suzukal]

You may want to lower the needle clip to richen it up not raise it.

[80-85 husky]

your right...i meant to say lift the needle...not clip!

[Momus]

Ive lifted the clip 80-85 husky . Im running a DT400 cdi system Momus . the same system that was in her b4 the rebuild .

Ok. Perhaps put a timing light on it and check not advanced or if the header is hot, retarded. I have had some recent fun and games with early Yamaha CDI.

[Iain Cameron]

Ralph the smell of burning alloy after 15 to 20 min runs better with the choke on . Might try a Cpl of extra head gaskets . Momus good idea will try the light .

[Iain Cameron]

I got it arse about to . Ive raised the needle not the clip .

[80-85 husky]

how is it running? crisp? lean? blubbery? got the right heat range plug ...sorry just randomly firing stuff out..

[TT5 Matt]

if it was running ok before why not put the old parts back in the carb and see if it cures it,tried doing plug chops to see whever its lean/rich or just right

[ralph311]

If it runs better with the choke on its definitely much too lean for some reason. That'll make it run hot. Fix the lean running and see what you think.

[80-85 husky]

ol mate had a very hot 440 at harrow and he dropped the needle 2 slots and it was perfect after that... but i get the hot bit... it was so hot it was ticking and you could feel the heat radiating from the motor for a metre away...must have been v close to a lock up. the plug was too hot to handle for 5 mins....

[Iain Cameron]

Well I now have a year to solve the problem . My falcon ute blew its gearbox on Thursday cant get one in time to swap over and still catch the boat over to vic to make the nats . tried rebooking no spaces left on the boat .