Sunny Sunday

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Rick Yamane

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May 15, 2023, 11:58:52 AM5/15/23
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I believe I am finally over the hump on my GTV saga. It’s been a long drawn out saga.
Yesterday competing with Mother’s Day and yardwork I found a bit of time to roll The GTV out and fire it up. In the first time since I’ve had it I got it started easily with NO CHOKE. Just tickling. I let it warm up a bit and ran it to the gas station to fill it up. Then I took it for about 2 miles on some neighborhood streets. She ran really well, no stalling but the lever friction dampers do not cope well at all with speed bumps! LOL!
Got her home and fiddled with the idle speed a little. The shifter is stiff but hopefully will free up with a few miles.
Setting my sights on the Rigid Ride, I believe next month. A nice local ride starting at the Alpine Inn in Portola Valley and heading out to the coast. Then back for lunch before parting ways. I usually ride my Rocket Gold Star but the GTV is much more “rigid”.

2023.05.14.1st fillup.jpg

jerry atric

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May 16, 2023, 3:36:33 PM5/16/23
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Glad to see you have success, I've been following your posts. I have exactly the same model; the head is currently with specialists laser welding cracks in the head. The cracks radiate out from the exhaust valve guide. What did you do to cure the spitting back?

James Friedlander

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May 17, 2023, 4:55:21 PM5/17/23
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beautiful thing. Enjoy

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Dave Knaack

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May 17, 2023, 5:01:56 PM5/17/23
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I thought it was a great looking bike image0.jpeg
This is what I started with. A reasonably complete bike that ran !
On May 17, 2023, at 3:55 PM, James Friedlander <jimsb...@gmail.com> wrote:



Rick Yamane

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May 17, 2023, 6:42:20 PM5/17/23
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Hi Jerry,

The spitting back seemed to just kind of go away. Yeah, I know, but hey, I’ll take it. Seems like a lot of problems I was having went away after I replaced the flywheel. Not sure why that would have a real big impact since all it is, is just a weight. I guess with it oscillating back and forth a bit maybe it was affecting the smoothness of the idle speed. I need to recheck the timing. I think it’s got too much advance which also means it might not have as much retard as it should. Either way it is starting very easy. Idle still hangs up a bit like it’s lean but I’m sure the carb is well worn and is probably sucking air around the slide. I just need to do short hops on it and play with it until I’m confident I’ve worked out the bugs.

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Alan Comfort

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May 17, 2023, 7:58:14 PM5/17/23
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The "spit back" on my 'slicers goes away when the engine is warmed up.
Alan in Roberts Creek

pouma1954

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May 18, 2023, 1:52:45 AM5/18/23
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I have the same problem on a 750 Laverda. I haven't been able to dial it out.
I've been suggested that it's fuel related.
Paul



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-------- Message d'origine --------
De : Alan Comfort <alan.c...@gmail.com>
Date : 18/05/2023 01:58 (GMT+01:00)
Objet : Re: [guzzi-singles] Re: Sunny Sunday

Rick Yamane

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May 18, 2023, 11:10:28 AM5/18/23
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Try velocity stacks (longer ones) and raising the needles a notch.

pouma1954

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May 19, 2023, 5:44:43 AM5/19/23
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It's already rather rich on the main jets. It's fine when warm.
Paul



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-------- Message d'origine --------
De : 'Rick Yamane' via Guzzi Singles <guzzi-...@googlegroups.com>
Date : 18/05/2023 17:10 (GMT+01:00)
Objet : RE: [guzzi-singles] Re: Sunny Sunday

Andrew Nahum

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May 19, 2023, 9:29:33 AM5/19/23
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According to classical theory! leaning out on cracking open the throttle implies the cut-away on the carb slide is too big (high).  But it’s not a thing that can change unless some PO tried tuning it with a file.  The pilot jet contributes quite a long way up the range so richening that may help. Unless plug is already sooty in town running. 



On 19 May 2023, at 10:44, pouma1954 <poum...@gmail.com> wrote:



Rick Yamane

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May 19, 2023, 11:33:50 AM5/19/23
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You can still go down a step on the mains. The needles control a wide range but once they reach a certain height the main jets control more and more.
The longer venture provided by a velocity stack, or a longer one can really help mixing the air and fuel and increasing the intake speed. People always concern themselves with flowing ports, port size and shape but often overlook the airflow as it enters the bell mouth.
That is one thing I did on my GTV. I pulled off the air filter and went to a velocity stack.

Alan Comfort

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May 19, 2023, 11:45:09 AM5/19/23
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Ah....the black art of carb tuning. It takes a lot of experimenting, but it is worth it when you get it right.

Rick Yamane

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May 19, 2023, 11:46:11 AM5/19/23
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I had a ISDT Jawa that I fitted a Bing to. I was having trouble with it right off idle so a friend mentioned filing a notch on the front side of the slide, about 1/8” wide and 1/8” high. The thinking is that it allows air through sooner at the very bottom of the venturi which is where the needle jet and idle passage are. This extra flow would result in more negative pressure there to help pull more fuel through. It helped but I got an offer for the bike before I really had it completely sorted. The new owner ended up with a Mikuni but I wanted a Bing because that’s what the factory teams were running. Sometimes authenticity is a curse! LOL.
I also agree with Andrew. There is, in my experience a lot more overlap in jetting than the books and manuals would have you believe.

Rick Yamane

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May 19, 2023, 11:48:11 AM5/19/23
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Until they go change the fuel formulas again! Hahaha!

 

From: guzzi-...@googlegroups.com [mailto:guzzi-...@googlegroups.com] On Behalf Of Alan Comfort
Sent: Friday, May 19, 2023 8:45 AM
To: guzzi-...@googlegroups.com
Subject: Re: [guzzi-singles] Re: Sunny Sunday

 

Ah....the black art of carb tuning. It takes a lot of experimenting, but it is worth it when you get it right.

 

guzz...@aol.com

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May 19, 2023, 11:49:06 AM5/19/23
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what does your spark plug look like ,,,,,,,,, after a run

Tim


Alan Comfort

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May 19, 2023, 12:01:34 PM5/19/23
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We are fortunate here in Canuckistan: we can still buy ethanol free gasoline.
Every now and then I take a great notion to sell off all of my obsolete scrap metal and buy a new Honda then trade it in when the warranty expires. Trouble is I cannot find a new motorcycle that I want to ride or look at. All that plastic, goofy electronics and angular styling take the edge off the ease of ownership.

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Richard Wood

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May 19, 2023, 12:07:34 PM5/19/23
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Have a look at the Royal Enfield range Alan. As simple as you can get nowadays. 


Richard 



Andrew Nahum

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May 19, 2023, 6:51:58 PM5/19/23
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I know this must have been posted many times before but this is the guide to tuning simple slide carbs like Amal, but it’s also helpful for all the imitators like Dellorto and Bing (the earlier ones that look like classic Amals. Not the later constant vacuum diaphragm types). 




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On 19 May 2023, at 16:46, 'Rick Yamane' via Guzzi Singles <guzzi-...@googlegroups.com> wrote:



pouma1954

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May 20, 2023, 5:06:59 AM5/20/23
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Slides are changed regularly. That bike is a near daily hack and holiday ride.
Paul



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-------- Message d'origine --------
De : Andrew Nahum <andrew...@gmail.com>
Date : 19/05/2023 15:29 (GMT+01:00)

pouma1954

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May 20, 2023, 5:09:15 AM5/20/23
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Rather on the lean side 
Paul



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-------- Message d'origine --------
De : guzzigal via Guzzi Singles <guzzi-...@googlegroups.com>
Date : 19/05/2023 17:49 (GMT+01:00)
Objet : Re: [guzzi-singles] Re: Sunny Sunday

what does your spark plug look like ,,,,,,,,, after a run

Tim


-----Original Message-----
From: pouma1954 <poum...@gmail.com>
To: guzzi-...@googlegroups.com
Sent: Fri, May 19, 2023 4:44 am
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