Larger main jet...

[Mikep328]

I would like to try the next size larger main jet from the OEM 75s.  DSS does not seem to carry anything other than the 75.  Are larger sizes available nowadays anywhere?

I've been thinking about that for a while re ethanol blend fuels and since I have the carbs off at the moment for a different reason, it would be a good time to change them/perform the experiment!

[ozzybud]

CMSNL has OEM 80's.
Why do you want to go larger?  Pods?

[Mikep328]

"CMSNL has OEM 80's."

Thanks!  I was thinking that ONE size larger would be correct to compensate for E10 fuel's reduced BTU output compared to E 0.  IOW, one size larger with E10 would make the same max power as the standard 75 on E 0.  From reading some Keihen info this morning, it sounds like a #78 would be one size larger.

OTOH, the bike runs great and, based on info here, I'm going to switch to E5 assuming it's readily available at stations in my area so I'm no longer looking to change main jets... at least for now! 

[TrickyMicky]

Just as a matter of interest, My 400 is bog standard, even running OE points, coils  etc.,  I use E5, Shell where possible, and so far no problems.  At the end of a ride I close the fuel tap a little way from home.  After ir's been stood for 2 or 3 weeks, I turn the fuel on, give it a few seconds to find its way to the carbs, then it's full choke, a whiff of throttle and it starts.  My main criteria is that the engine does not get started unless it's going to get ridden far enough for it to get hot.  I suffered many years ago with a CB750 that I used for my 3 mile each way journey to work.

[Mikep328]

I also close the fuel tap but I don't have a good feel for where to do that.  There is a lot of traffic in the vicinity of our garage (about 3/4 mile from our house) and I don't want the bike to suddenly quit while dealing with it!  So most of the time I end up idling outside the garage with the fuel off until the engine quits.  Sometimes that takes what seems to be a rather long period of time!