OEM Carb Mods While You Are Saving For FCR Flatslides.

[Howie]

I have sold my Monster, <snip>

 

[koko64]

Yep

On the bright side, it has gone to a customer who has desperately wanted one and who will cherish it like I did. It stays in the family and I will still take care of it.


I'll pick up this thread if there are any questions or when I next work on a set of modified carbs.

[scaudill]

01 M750 BDST-38
What is the correct float height number?  I read 14mm somewhere, the carbs are now on my workbench.  The number I'm getting is 10mm. 
Pilot jets are 37.5, mains are 140.  Manual call for 40 pilot and 132.5 mains.
K&N air filter and exhausts are now straight thru with perforated tube.
Any suggestions?
Sterling

[ducpainter]

Most use the 14mm height, but that is with stock pilot jets. It might be that the PO raised the float height to counter the effect of the smaller jets.

The ;larger mains make sense with the exhaust mod,

How did it run?

[koko64]

Or they used the FCR float level by accident (9mm)? A 4mm difference is a fair step..
Stock airbox?

[scaudill]

When I got the bike it had foam pods.  One of them caught fire.  I went back to the stock airbox with a K&N filter.
The bike ran pretty good but before putting it away for winter the idle needed to be turned up.
I have since shortened the silencers and removed everything inside.  I used a perforated tube with fiberglass packing.
I did ride it once after the silencer mods, bike ran well but would not idle without help from the enrichener.
Now I have the carbs off, I'm going to install #40 pilots.  Now I don't know if I should reset the floats to 14mm or what.  Its going to be 70 here tomorrow, 72 on Wednesday. So what do I do?  I can change jets easy with the carbs on but setting the floats for me is next to impossible.  Replacing the cables took me a couple of days last time.
Sterling
Thanks for responding

[Howie]

14 mm.

[koko64]

Don't disconnect the cables from the carbs, disconnect them from the throttle tube.

Check your needle jets for being worn oval by the needles sawing at them. If they are silver looking in colour and not bronze, then leave them as they are more likely to be ok.

With straight through pipes consider a larger main jet again if it feels hesitant and weak at higher revs and greater throttle opening. You may need a jet kit. Maybe give Dynojet or Factory Pro a call and discuss your open pipes.

[koko64]

Also, you will need to adjust your idle mixture to get a nice even idle. Once you have put the 40 slow jets in you could start at three to three and a half turns out from gently seated as a base line. Set your warm idle speed at around 1250 rpm if it has a tacho. If you have a manometer  giving the carbs a good synch works wonders for smoothness and response.

[scaudill]

My plan as of this morning is:
Adjust floats to 14mm
Install the #40 pilot jets
Put everything back together and see what happens.

Hopefully I'll have some results this afternoon.

Thanks, Sterling

[koko64]

How did it go?

[scaudill]

The #40 pilots are to small, I have 42.5s and 45s coming tomorrow. 
It will idle but screws are out almost 4 turns.  Will not take throttle and will not cruise at low rpm's.
It rips if the rpm's are up.  When I get the pilots right, maybe at low rpm cruise will get better.
I knew that lowering the floats 4mm would create new problems. 
Appreciate your interest. 
Rain is predicted for a few days, so I'll do the jets tomorrow.  When the rains stops I'll do some more testing.
Sterling

[koko64]

What method did you use to adjust the float level?

Will be interested to see if 42.5s or 45s work best.

Would you describe your exhausts again, or maybe a pic?

[koko64]

When I got the bike it had foam pods.  One of them caught fire.  I went back to the stock airbox with a K&N filter.
The bike ran pretty good but before putting it away for winter the idle needed to be turned up.

I did ride it once after the silencer mods, bike ran well but would not idle without help from the enrichener.

That might be your issue there. Don't be surprised if foam pods don't flow as well as an airbox with K&N filter.

[scaudill]

I took some pictures.  Can someone direct me to a tutorial to upload.
Jets should be at the mc shop today.