Idles fine - but not in the mid range

[chuck hahn]

I do not have a manual....maybe bikecliffs website????

But what you can do is to check the hgts as they are now..then LOWER them by 1/2MM or 1MM and see how she runs then. Lowering the float hgts will raise the fuel levels in the carbs the same amout..so if you lower the hgts by 1/2MM, then the fuel will be 1/2 MM higher in the bowls..Follow me?

[phrode]

I have now taken the carbs apart, but I cant find any place to adjust the hight??

[almarconi]

but I cant find any place to adjust the hight??

There is a little tab on the float that you need to GENTLY bend. This procedure is in the service manual. You have a manual don't you?

[phrode]

All I got is basscliff's carb manual.

I checked it with a micrometer, but there is no way I can adjust that 0,5mm. What if I get it 2mm out of position?

[almarconi]

I checked it with a micrometer, but there is no way I can adjust that 0,5mm. What if I get it 2mm out of position?

I really can't understand what you are trying to say. Here is a picture of what you should be trying to set:



Measure the height A and then gently bend the tab to set the float height.

[spyug]

Gentelmen, I think you may be confusing our new friend and maybe complicating his life.

Before you go buggering about with float heights and other esoteric carb mumbo jumbo Mr. Phrode dissassemble and properly clean the carbs in dip for a minimum of 24 hours. Dry everything off and blow through all passages with compressed air. Reassemble with the new o-rings and try again. If you are still getting the same issue then start playing with float height but I'm betting the heights are correct and have never been previously adjusted and are not your problem.

Now to get the full value out of your cleaning, you need to do both a static balance or synchronization and the details of how to are in the manual and also in the carb cleaning tutorial. After this you need to also do a dynamic balance or synchro which requires a 4 port vacuum guage (like the Morgan Carbtune). Without doing both your new carbs are not going to perform to their best.

Carb work is intimidating at first but it isn't rocket science. Just be organized, take your time and be thorough. About 60% of the carb related issues stem from plugged jets and dirty passages and the remainder from leaky o-rings letting in air.

Clean the carbs and stop the leaks and you'll find things will work fine.

Good luck with it and let us know when you have it sorted.
Spyug

[GateKeeper]

All I got is basscliff's carb manual.

I checked it with a micrometer, but there is no way I can adjust that 0,5mm. What if I get it 2mm out of position?

2mm is way too much out, you should be able to get them within 1mm of factory spec

see the manual for the correct measurement

.

[phrode]

Spyug: Thank you :-)

[almarconi]

think you may be confusing our new friend and maybe complicating his life

Checking the float height IS a normal part of the rebuild process. Why go through all the trouble of putting the carbs back together, installing them on the bike only to find that the float height is not correct. It only takes a few minutes to check. Taking shortcuts is never a good practice. There will be no confusion if you take the time to understand what you are doing.

[8ball]

Checking the float height IS a normal part of the rebuild process. Why go through all the trouble of putting the carbs back together, installing them on the bike only to find that the float height is not correct. It only takes a few minutes to check. Taking shortcuts is never a good practice. There will be no confusion if you take the time to understand what you are doing.

Why take him through any of this, until you get an answer to the question regarding pods or air box.

Could be a jetting issue, not a maintenance issue.

[almarconi]

Pods or airbox make no difference in terms of checking the float height. If you are cleaning the carbs, check the float height. I get the impression his airbox is damaged, he wants to run pods but does not want to rejet. Until the basic maintenance is done its hard to know where to begin.

[8ball]

I understand that, but my point is that starting off at float ht., or even cleaning the carbs, may be starting him at step 3 or 4 in determining the problem. By his description you only know that his bike runs lean. Step one is to find out more info. Ie. does he have pods without jetting changes. If not, then determine what other issues he may have...has the bike been sitting for a while? Did this issue just star happening? Does the petcock work? ...and we haven't gotten to the point of "take your carbs apart, buddy."

See what I'm getting at?

[almarconi]

I understand what you are saying but he is not telling the whole story in this thread.He already has the carbs apart so he might as well clean them properly.

[phrode]

Carbs cleaned (no floats adjusted). It is runs "fine" now... So thanks for all the help :-) I just have a airbox problem left. 4 new air intake boots is on its way from the US to fix that (60US$ in freight!!!).

There is just one more question.

The air screw on each carb. Are they supposed to tightend and then 1 1/2 turn back?
How far should I turn them in clockvice? I feel Im going to damage the o-ring if I tight it too much.

[chuck hahn]

Air ( Mixture ) screws are flat and dull on the ends, so there are no tips to break off like with the pilot screws ( bottom ones ).

So, you can tighten them down full..not with wrenching pressure but fully bottomed out ..and then back them out 1 1/2 turns.

Pilots on the bottom shopuld be right at 7/8 from very LIGHTLY seated at the bottom. Very gently turn them in and when they stop dont force them..they are at the bottom. Then back them out. All the orings should have a dab of grease or vaseline on them to let them slide easily and not snag as you do adjustments. If you didnt do this, you can still do them.


Wish you were in the states...I would send you my Colortune kit to fine tune each cylinder. Do a youtube search of the thing in action...it works wonders!!!