Honda-SOHC
General => New Member Introductions => Topic started by: AndyPerthWA on March 09, 2022, 12:05:54 PM
-
Hi everyone, I have just rebuilt my 400-Four which I purchased in Sydney in 1983. She has been across the Nullabor Plain 3 times and now resides in Perth, Western Australia.
having trouble setting up rebuilt carbs, they are leaking out the overflows.
Cheers
Andy
-
Welcome to the forum, posh garage there ;D
The carbs can take quite a bit of detailed careful work to get them comfortably working certainly.
Bike looks really good.
-
Thanks K2-K6, it's frustrating trying to get her running well without overflowing fuel, I've had the carbs on and off about 20 times!
-
Welcome to the forum. We have a few 400/4 owners in Perth hopefully one will pop up soon and say Hi.
-
Thanks K2-K6, it's frustrating trying to get her running well without overflowing fuel, I've had the carbs on and off about 20 times!
Have you tried polishing the inlet valve seats of the float valve shutoff? Something like a bbq wood skewer with t-cut (just a gentle abrasive polish) to make sure of competent sealing surface may assist reliable close off.
Either twizzle it with your hands or spin slowly in a drill to give the tapered seat a clean and smooth surface.
Drives you nuts when they keep letting fuel out doesn't it. Seems so simple but fundamental to running well.
-
Welcome to the forum. Hope you get the overflowing sorted. Plus 1 on K2-K6's suggestion.
-
Welcome to the 400/4 forum :). As anybody will tell you, the yellow ones were the fastest!
I agree with Nigel about the carbs, they are a real pain to set up to avoid leaks. I have found along with many others on the forum that it is best to use the old brassware if you can and cleaned in an ultrasonic bath along with the rest of the carb parts. I have used Keyster carb kits twice and could not stop the leaks so reused the originals and hey presto, no more leaks.
Did you bench sinc the carbs before putting the carb bank back on the bike, worthwhile doing and saves a whole lot of aggro if you do.
Type in 'carbs' to the search box and you'll get a few links to threads all mentioning the same subject.
-
Welcome to the forum. We have a few 400/4 owners in Perth hopefully one will pop up soon and say Hi.
Thanks for the welcome Nurse Julie, I will view your posts.
-
Welcome to the 400/4 forum :). As anybody will tell you, the yellow ones were the fastest!
I agree with Nigel about the carbs, they are a real pain to set up to avoid leaks. I have found along with many others on the forum that it is best to use the old brassware if you can and cleaned in an ultrasonic bath along with the rest of the carb parts. I have used Keyster carb kits twice and could not stop the leaks so reused the originals and hey presto, no more leaks.
Did you bench sinc the carbs before putting the carb bank back on the bike, worthwhile doing and saves a whole lot of aggro if you do.
Type in 'carbs' to the search box and you'll get a few links to threads all mentioning the same subject.
Thanks for the welcome Laverda Dave, yellow is great though mine was red originally and spent most of its life black!
Thanks for the advice, I may reinstall the original jets but they are terribly gummed up
-
Thanks K2-K6, it's frustrating trying to get her running well without overflowing fuel, I've had the carbs on and off about 20 times!
Have you tried polishing the inlet valve seats of the float valve shutoff? Something like a bbq wood skewer with t-cut (just a gentle abrasive polish) to make sure of competent sealing surface may assist reliable close off.
Either twizzle it with your hands or spin slowly in a drill to give the tapered seat a clean and smooth surface.
Thanks K2-K6, I'll give that a go next time the carbs are off!
Drives you nuts when they keep letting fuel out doesn't it. Seems so simple but fundamental to running well.
-
Welcome to the forum. Hope you get the overflowing sorted. Plus 1 on K2-K6's suggestion.
Thanks for the welcome Phil, and the recommendation
-
Thanks for the welcome Laverda Dave, yellow is great though mine was red originally and spent most of its life black!
Thanks for the advice, I may reinstall the original jets but they are terribly gummed up
[/quote]
I have found that overnight soaking in petrol & acetone make good solvents on carb parts.
-
Thanks Ted, I'll give them a soak and try to clean them up!
-
It wasn't so much the jets but the fuel cut off valve that gives the problems of leaking carbs. The new valves don't appear to seal properly hence Nigel's comment about using T-cut. I tried it but it didn't work so I cleaned up the old valves and it cured it.
Float height is also critical.
-
Thanks Dave, I’ll soak all the old brassware in petrol or acetone and try to scrub them back into shape
-
Hi, Andy. I recommend acetone rather than petrol. If you have access to and ultrasonic cleaner that will be of be fit too.