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Author Topic: 74 Honda XL 350 - The Turd  (Read 49575 times)

Offline advCo

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Re: 74 Honda XL 350 - The Turd
« Reply #490 on: Jul 31, 2017, 17:40:17 »
I think I will fit the 34 after I get it dialed in and see how I like it..

Still hard to start. Compression is at 150. Spark is good. Timing has been set. I just cleaned the carb before I tried to start it up. Nothing.

Getting tired of kicking this thing might have to put a decomp in lol


Sent from my iPhone using DO THE TON
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline advCo

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Re: 74 Honda XL 350 - The Turd
« Reply #491 on: Aug 06, 2017, 20:16:39 »
So I pulled the carb again today and REEEEEALLY cleaned it. Tossed it back on w/the fuel bottle and got nothing after 4-5 kicks. Pulled the plug and it's dry as a bone. Sprayed a shot of starter fluid and it fired right up. Not sure what's going on with the carburetor but something fishy is up.

Once she's running it's like a bat outta hell. This thing is a torque monster. Brought it around the neighborhood for about 15 minutes with no issues whatsoever.

Stalling issue is most definitely fixed. I ran around with the fuel cap just resting on there to see if that did the trick and it surely did. Got some fuel on my legs but at least I got to ride it. I think I'll put a brass barb and breather tube on the cap.

Going to let it cool down and see if it wants to start back up in a bit.


Sent from my iPhone using DO THE TON
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline advCo

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74 Honda XL 350 - The Turd
« Reply #492 on: Aug 06, 2017, 22:11:23 »
The plug after today's ride. Looks like a faulty needle and seat may have leaked some fuel into the crankcase. I'm lucky it didn't hydrolock if it did happen. I had to take quite a bit out of the crankcase, like almost 1L, but It didn't really smell of fuel. Shrug.  Going to change the oil before I run it again.

Time to start piecing together that Mikuni and put the Keihin in the trash.

« Last Edit: Aug 07, 2017, 00:46:06 by advCo »
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline advCo

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Re: 74 Honda XL 350 - The Turd
« Reply #493 on: Aug 08, 2017, 19:32:31 »
Got the correct amount of oil in there after a change or five... (a long story for another day)

Threw in a new plug and the old girl starts right up first kick every time.

My method is 1 kick with main switch off to prime. Turn switch on and one good kick and she fires right up. Seems to be running really well. I need to do something to quiet this exhaust so I can go down and get this thing inspected. Maybe rebuild the baffle with 1/2" pipe instead of 3/4"?

« Last Edit: Aug 08, 2017, 19:35:59 by advCo »
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline trek97

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Re: 74 Honda XL 350 - The Turd
« Reply #494 on: Aug 08, 2017, 20:57:24 »

Offline mitchn06

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Re: 74 Honda XL 350 - The Turd
« Reply #495 on: Aug 09, 2017, 00:38:53 »
Glad to hear you are getting it sorted my friend!


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Offline advCo

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74 Honda XL 350 - The Turd
« Reply #496 on: Aug 09, 2017, 13:18:39 »
I've noticed while tuning the stock Keihin that the mixture screw does not cause the motor to stall or bog when screwed in all the way. It is on the engine side, so therefore it is a fuel screw if I am not mistaken. In this case, turning the screw IN should lean out the mixture. In this case, it would appear that the idle circuit is too rich, so a smaller pilot jet would be the solution?

The fastest idle speed is achieved at about 1/2 turn out. The manual states typical setting should be between 7/8 to 1-1/4 turns out.

In the factory service manual, Honda refers to the mixture screw as an air screw. Clear as mud. Can anyone help clarify?

A pic of the carb for reference (for anyone unfamiliar, the engine is on the right hand side)

« Last Edit: Aug 09, 2017, 13:25:29 by advCo »
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline advCo

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Re: 74 Honda XL 350 - The Turd
« Reply #497 on: Aug 11, 2017, 10:35:05 »
Any advice on mixture screw?

Meantime, here's a cold start vid.




Sent from my iPhone using DO THE TON
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline JSJamboree

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Re: 74 Honda XL 350 - The Turd
« Reply #498 on: Aug 17, 2017, 09:55:53 »
Any advice on mixture screw?

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Nick, get yourself one of these bad boys.  They work killer and will really help you dial in the mixture screw and also help you understand where you fuel is through most of the throttle.

https://www.amazon.com/Colortune-for-14mm-Spark-Plug/dp/B000E9VGNM

Offline cxman

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Re: 74 Honda XL 350 - The Turd
« Reply #499 on: Aug 17, 2017, 13:42:03 »
what is it you dont understand about the air screw adjustment out is richer

stock setting is 1.5 turns
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
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and a bunch of others