Help a newbeginner..

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19 Mar 2017 15:05 #757162 by Nessism
Replied by Nessism on topic Help a newbeginner..
If the idle is creeping up when hot you got a lean condition, possibly leaking air into the rubber boots.

I'm not familiar with those particular carbs but typically the pilot fuel screws on the bottom should be open about 7/8 turn from lightly seated and the pilot air screws, located on the side, should be about double that.

One major issue you may have it jetting. VM24's with a 750 engine is sort of uncharted territory. Only thing I can suggest is to keep experimenting to see what helps and what doesn't. If the stock jetting is a 100 main and you are at 125 it seems to me that you are too rich but I'm not a jetting guy. Typically, when running pods, you need to bump the mains about 4 steps or so. And the pilots should never be bumped more than one size.

If you have the option to install the airbox w/filter and return the jetting to stock I'd start there. You can always move back to pods after you confirm the engine is reliable and well sorted.

Good luck
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20 Mar 2017 11:40 #757233 by gordone
Replied by gordone on topic Help a newbeginner..

Nessism wrote: If the idle is creeping up when hot you got a lean condition, possibly leaking air into the rubber boots.

I'm not familiar with those particular carbs but typically the pilot fuel screws on the bottom should be open about 7/8 turn from lightly seated and the pilot air screws, located on the side, should be about double that.

One major issue you may have it jetting. VM24's with a 750 engine is sort of uncharted territory. Only thing I can suggest is to keep experimenting to see what helps and what doesn't. If the stock jetting is a 100 main and you are at 125 it seems to me that you are too rich but I'm not a jetting guy. Typically, when running pods, you need to bump the mains about 4 steps or so. And the pilots should never be bumped more than one size.

If you have the option to install the airbox w/filter and return the jetting to stock I'd start there. You can always move back to pods after you confirm the engine is reliable and well sorted.

Good luck


I got a advise from a person on Facebook (hehe), he said I could try with some "start gas", spraying around the inlet and the engine should not react on it.

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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20 Mar 2017 13:18 #757239 by Conspiracy
Replied by Conspiracy on topic Help a newbeginner..

gordone wrote:
I got a advise from a person on Facebook (hehe), he said I could try with some "start gas", spraying around the inlet and the engine should not react on it.


I believe he was telling you how to check for vacuum leaks around your intake. Spraying fluid (carb cleaner, brake cleaner, wd-40) around the boots will temporarily block the air leak, which may cause the RPM to drop. If the RPM drops while you're spraying you know you have a leak in the connection point between carbs and engine. A leak there will allow air to be pulled past the carb into the engine creating a lean condition. Lean condition = high RPM

Novice rider
1976 KZ900
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20 Mar 2017 15:41 #757248 by gordone
Replied by gordone on topic Help a newbeginner..

Conspiracy wrote:

gordone wrote:
I got a advise from a person on Facebook (hehe), he said I could try with some "start gas", spraying around the inlet and the engine should not react on it.


I believe he was telling you how to check for vacuum leaks around your intake. Spraying fluid (carb cleaner, brake cleaner, wd-40) around the boots will temporarily block the air leak, which may cause the RPM to drop. If the RPM drops while you're spraying you know you have a leak in the connection point between carbs and engine. A leak there will allow air to be pulled past the carb into the engine creating a lean condition. Lean condition = high RPM


I`m quite sure he thinked about the gas will increase RPM since it`s start gas, the vaccum will suck in... ?

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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20 Mar 2017 16:06 - 20 Mar 2017 16:33 #757251 by KZB2 650
Replied by KZB2 650 on topic Help a newbeginner..
Keep the rs as low as possible to make the most vacuum at the carb/holder when spraying and have read more than a few times on here that will only show a large leak and not a small one but give it a try anyway. And when you take the carbs off to jet em give us a straight on picture of the bowl still on the carbs so if we can see if it has the second pilot screw on the bottom.

1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.
Last edit: 20 Mar 2017 16:33 by KZB2 650.

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