Search 650Rider.com and XS650.com using Google!
|
| |
|
|
xs650 > > Motorcycle Systems > > Fuel > > Quick Mikuni/general carb question.. |
---|
Quick Mikuni/general carb question..
|
Author |
Message |
SClay Full Member
Joined: May 30, 2008 Posts: 93
|
Posted: February 3, 2009, 2:51 pm Post subject: Quick Mikuni/general carb question.. |
|
..I never did quite realize this, but you cannot mount a carburetor, in this case, a Mikuni VM, angled downward(in relation to the engine, with the filter bore being lower than the throat bore at the engine) can you?
Can anyone confirm or deny this? It just suddenly dawned on me that if you did this, it would starve the pilot circuit of fuel. No?
Steve
|
|
Back to top |
|
|
metalredneck Full Member
Joined: Aug 04, 2008 Posts: 308
|
Posted: February 3, 2009, 3:27 pm Post subject: Re: Quick Mikuni/general carb question.. |
|
I believe the angle is fairly crucial. Most carbs are horizontal, but the carbs on my ol' VF 1000 v-4 were angled down, in a v-4 configuration. Float levels you may be able to compensate for, but venting & jet placement will be sketchy.
_________________ Kick it 'til it vibrates. |
|
Back to top |
|
|
JeffM Full Member
Joined: May 07, 2008 Posts: 285 Location: Victoria, BC, Canada
|
Posted: February 3, 2009, 3:34 pm Post subject: Re: Quick Mikuni/general carb question.. |
|
It would affect your float setting for sure, even a mm can make a difference.
You may be able to compensate by changing the float setting. Perhaps experiment with some sort of zip-tie hanger off the frame with an eye to building a bracket??
Jeff
|
|
Back to top |
|
|
SClay Full Member
Joined: May 30, 2008 Posts: 93
|
Posted: February 4, 2009, 12:58 am Post subject: Re: Quick Mikuni/general carb question.. |
|
Another question folks, as I am having contradicting bits of information here. On the VM34 Mikunis, the mixture screw, in what fashion does it function?
Now, I am looking at the manual, and there is a graph. And it says that screwing the mixture screw in richens up the mixture, and backing it out leans it out. And then other places say it is the other way round.
Which is it? I can't believe I even have to ask this, but the VM manual leaves a bit to be desired in the translation department, and I just want to get a straight answer.
Or maybe my brain just hurts a little bit from battling with this thing.
Am I correct with this theory:
At Idle/low speed, there is enough vacuum being generated by the inlet air to pull fuel up from the pilot jet. But you alter the actual fuel ratio by only adding air to this particular mixture, before it enters the actual intake charge, and then traveling to the engine.
Am I close to being correct?
Please however, correct me if I am wrong.
Steve
|
|
Back to top |
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You can download files in this forum
|
|
|
|
|
Check out the new Honda CB750 Forum at CB750.com! A site dedicated to the great Honda SOHC and DOHC CB750.
Check out the new Yamaha XS400 Forum at XS400.com!
Yamaha xs650
xs650, xs, 650, forum, links, chopper, custom, yamaha, parts, forum, info,
information, bb, bulletin board, XS650 650Rider, Free Unrestricted xs650
forum, Personal photo albums, Post images in Forum, News columns, Daily blog,
Links, Event calendar, Information for Yamaha XS650
Interactive software released under GNU GPL,
Code Credits,
Privacy Policy
|
|