Guden Tag then bud!
Going back to standard would be bestest, but if it was running good 6 years ago I’d leave it until you work out the problem with ticking over @ 5000rpm! Even having no filter wouldn’t cause it.
Have you removed all the filter bits and cleaned out the carb since finding it, are you sure the slide is closing fully? No cable catching on an adjuster?
I usually spray a bit of carb/brake cleaner around suspected areas while the bike ticks over. If there’s a leak it usually settles down to normal revs...
It really does sound like a big air leak between the casing and the carb...
After that I cleaned the airbox and put a new and oiled filter in there.
Then I opened the carb, 5 screws were done and had to be drilled out, was a 2 hour pain in the ass work, I will use better screws with hexagon drive soon
I wondered how clean the carb was inside
The housing parts etc. are now ultrasonic cleaned and the spare parts available are ordered
Do the gaskets for the housing parts have to be oiled during assembly?
What would be the correct torque for the housing screws?
Now in hindsight I remember the choke's nut was loose
I didn't pay any attention to that, maybe that could be the cause of the air leak you mentioned.
**Do the gaskets for the housing parts have to be oiled/greased during assembly?
What would be the correct torque for the housing screws?**
I’d use a small amount of grease myself. The bolts I do by instinct. You’d need a mikuni manual or search their site. It’d be almost unmeasurable unless you have a very delicate torque wrench...
Yes, precisely because it is difficult to estimate, I always use a torque wrench on my rides to tighten if possible and the values from the manufacturer are available
Mikuni manuals do not have this info apparently
I guess 5nm would be max for the m4 screws, and about 3nm for the brass stuff, but official data would be nicer
As long as the threads are all clean, I do them all finger tight, then 1/4 to 1/2 turn. As long as they are all the same. That’s what’s important...
Calum last edited by
Yeah torque wrenches have their uses, but with soft metals you have to be really careful, much better to do it by feel. It's not something that undergoes massss of stress so torquing it isn't absolutely necessary.
I found new informations, here are the essential tightening torques:
Float chamber screws: 2.0 Nm
Main jet: 2.0 Nm
Slide cover screws: 2.0Nm
Screw slide lever: 3.5Nm
Drain screw: 2.0Nm
carb housing gasket at https://www.gasketguru.co.uk/
Also i found the throttle-spring at http://www.motocarb.com/tm-parts.html
still looking for the nozzle assembly
can you allow to edit posts, then I could reformat opening post and edit this infos? could be nice for others also looking for parts and stuff
Calum last edited by
@chris Create a new thread with the appropriate title and formatting, and I will sticky the post for you bud!
okay, will do that later when the carb is complete