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KOMBI NIKO
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Joined: February 03, 2013
Posts: 277
Location: Australia
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 Posted: Mon Sep 20, 2021 10:48 pm Post subject: 2nd gear hesitation? |
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Hi guys, I'm having probs with a flat spot/ hesitation once I change down into 2nd and take off again. its only few a few seconds but dam annoying.
My set up is a freshly build 1641cc single port motor running a solex 31-3 pict carb, and a magaspark2 distributor. The carbie is running a 130 main jet and 55 fuel correction jet. No vacuum advance hooked up. Could this be a jetting issue or perhaps the magaspark? At idle it runs perfect and with the o2 meter hooked up its right in the middle for lean/richness. One thing I've noticed is if I turn the idle mixture screw all the way in at idle it doesn't kill the motor. Have checked for vacuum leaks and exhaust leaks all good.
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johny__utah
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Joined: September 02, 2008
Posts: 426
Location: Arizona/California
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| Posted: Tue Sep 21, 2021 3:08 pm Post subject: Re: 2nd gear hesitation? |
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Sounds like a ignition/spark problem. I would say your condenser but it being magnaspark. Check your sparkplug gap.
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Culito
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Joined: December 07, 2006
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Location: Columbia Missourah
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| Posted: Tue Sep 21, 2021 3:22 pm Post subject: Re: 2nd gear hesitation? |
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Vacuum advance never hurts on a heavy bus.
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KOMBI NIKO
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Joined: February 03, 2013
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Location: Australia
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KOMBI NIKO
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Location: Australia
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KOMBI NIKO
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Danwvw
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Joined: July 31, 2012
Posts: 8892
Location: Oregon Coast
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| Posted: Sun Sep 26, 2021 4:42 pm Post subject: Re: 2nd gear hesitation? |
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Probably something changed maybe you went to a 1 1/2" Header should be 1 3/8", perhaps you installed a cam? Try a different distributor, that is easy.
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busdaddy
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Joined: February 12, 2004
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Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Sun Sep 26, 2021 5:03 pm Post subject: Re: 2nd gear hesitation? |
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| KOMBI NIKO wrote: |
| One thing I've noticed is if I turn the idle mixture screw all the way in at idle it doesn't kill the motor. |
Lets discuss your float level and fuel pressure, something's not quite right with that mixture screw.
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KOMBI NIKO
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Joined: February 03, 2013
Posts: 277
Location: Australia
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| Posted: Sun Sep 26, 2021 10:54 pm Post subject: Re: 2nd gear hesitation? |
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| Danwvw wrote: |
| Probably something changed maybe you went to a 1 1/2" Header should be 1 3/8", perhaps you installed a cam? Try a different distributor, that is easy. |
the og header was the smaller, then because I planed to go with the 34 pict I modded the end to a 1 1/2". Once the the 34 didn't work I went back to the 30/31 pict with that alloy adapter. The cam is stock. I will try another distributor once we are allowed to travel again.
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KOMBI NIKO
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Joined: February 03, 2013
Posts: 277
Location: Australia
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| Posted: Sun Sep 26, 2021 10:58 pm Post subject: Re: 2nd gear hesitation? |
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| busdaddy wrote: |
| KOMBI NIKO wrote: |
| One thing I've noticed is if I turn the idle mixture screw all the way in at idle it doesn't kill the motor. |
Lets discuss your float level and fuel pressure, something's not quite right with that mixture screw. |
Yes, float level was my next thing to look at, how does one check this or adjust the level? I think there's one washer under the needle/seat. I don't think fuel pressure is an issue as its a brand new pump.
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busdaddy
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Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Mon Sep 27, 2021 8:15 am Post subject: Re: 2nd gear hesitation? |
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| KOMBI NIKO wrote: |
| busdaddy wrote: |
| KOMBI NIKO wrote: |
| One thing I've noticed is if I turn the idle mixture screw all the way in at idle it doesn't kill the motor. |
Lets discuss your float level and fuel pressure, something's not quite right with that mixture screw. |
Yes, float level was my next thing to look at, how does one check this or adjust the level? I think there's one washer under the needle/seat. I don't think fuel pressure is an issue as its a brand new pump. |
Brand new from where?, many aftermarket pumps put out some wild pressures.
Check it by disconnecting or pinching the fuel line to the carb and then removing the top, measure the distance from the top lip of the carb body to the top of the fuel in the bowl.
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Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
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Danwvw
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Joined: July 31, 2012
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Location: Oregon Coast
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KOMBI NIKO
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Location: Australia
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KOMBI NIKO
Samba Member
Joined: February 03, 2013
Posts: 277
Location: Australia
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| Posted: Tue Sep 28, 2021 1:01 am Post subject: Re: 2nd gear hesitation? |
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| busdaddy wrote: |
| KOMBI NIKO wrote: |
| busdaddy wrote: |
| KOMBI NIKO wrote: |
| One thing I've noticed is if I turn the idle mixture screw all the way in at idle it doesn't kill the motor. |
Lets discuss your float level and fuel pressure, something's not quite right with that mixture screw. |
Yes, float level was my next thing to look at, how does one check this or adjust the level? I think there's one washer under the needle/seat. I don't think fuel pressure is an issue as its a brand new pump. |
Brand new from where?, many aftermarket pumps put out some wild pressures.
Check it by disconnecting or pinching the fuel line to the carb and then removing the top, measure the distance from the top lip of the carb body to the top of the fuel in the bowl. |
cheers I will do this check. The fuel pump was from mick motors (Australia)
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Danwvw
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Joined: July 31, 2012
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Location: Oregon Coast
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| Posted: Wed Sep 29, 2021 11:03 am Post subject: Re: 2nd gear hesitation? |
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| KOMBI NIKO wrote: |
It's running a stock 1500 exhaust, I can change out the manifold for a 1 3/8" one to see. Also I noticed the right side intake preheat tube is colder than the left side, might be blocked. |
On a working preheat one side will be quite hot compared to the other. yeah it could be something like accelerator pump in the carb or even the engine is just cold.
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KOMBI NIKO
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Joined: February 03, 2013
Posts: 277
Location: Australia
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| Posted: Wed Sep 29, 2021 6:53 pm Post subject: Re: 2nd gear hesitation? |
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| Danwvw wrote: |
| KOMBI NIKO wrote: |
It's running a stock 1500 exhaust, I can change out the manifold for a 1 3/8" one to see. Also I noticed the right side intake preheat tube is colder than the left side, might be blocked. |
On a working preheat one side will be quite hot compared to the other. yeah it could be something like accelerator pump in the carb or even the engine is just cold. |
I've changed out the accelerator pump gasket and it does work well. Motor is off the choke when I drive it. One thing is the top of the manifold near the carbie is super cold once its warmed up.
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Danwvw
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Joined: July 31, 2012
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Location: Oregon Coast
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| Posted: Thu Sep 30, 2021 1:32 pm Post subject: Re: 2nd gear hesitation? |
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Try to hook up the warm air to the carb if you still have the oil bath air cleaner etc... A new intake manifold & heat risers might help. One other thing would be to do some kind of single port dual carb set up better yet just get dual port heads for it and run dual 40 webers or Dell 36's. with dual port offset intake manifolds that don't need preheat because they bolt to the heads.
The engine can be made into a 1679cc by just changing to 88mm ThickWall Piston & Cylinders and running 92mm spec Dual Port Heads. Usually when modifying a single port to a dual port the 71 dog house fan shroud gets installed along with the better oil cooler they had but it's not totally necessary if you don't drive it too long too hard that could make it overheat with the single port's smaller cooling fan and it's Iron Oil Cooler. $25 "PAIR VW DUAL PORT CYLINDER TINS BLACK BUG BUS GHIA THING 113119303J 113119304H" e-bay
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KOMBI NIKO
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Location: Australia
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KOMBI NIKO
Samba Member
Joined: February 03, 2013
Posts: 277
Location: Australia
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| Posted: Thu Sep 30, 2021 10:23 pm Post subject: Re: 2nd gear hesitation? |
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| busdaddy wrote: |
| KOMBI NIKO wrote: |
| busdaddy wrote: |
| KOMBI NIKO wrote: |
| One thing I've noticed is if I turn the idle mixture screw all the way in at idle it doesn't kill the motor. |
Lets discuss your float level and fuel pressure, something's not quite right with that mixture screw. |
Yes, float level was my next thing to look at, how does one check this or adjust the level? I think there's one washer under the needle/seat. I don't think fuel pressure is an issue as its a brand new pump. |
Brand new from where?, many aftermarket pumps put out some wild pressures.
Check it by disconnecting or pinching the fuel line to the carb and then removing the top, measure the distance from the top lip of the carb body to the top of the fuel in the bowl. |
just checked the fuel level with the top off and the float in place it was 1" or 25mm with the float removed it was 30mm. Not sure if that's too low?
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oh its a single cab too.
