Author Topic: Hesitation and Stalling Issue (Read 2110 times)

Deltarider · « **Reply #25 on:** November 13, 2023, 12:23:25 AM »

Quote from: jonda500 on November 12, 2023, 08:01:19 PM

I can't be the only one who believes that with the inline paper filter removed fuel will happily flow through the fuel line as long as it doesn't run above the fuel level in the tank - even if it goes up down, up down, around the barrels, under the engine and back up to the carbs.

You must be one of the lucky ones. In the past I have tried all possibilities (see pic) and always, sometimes much later (!), ran into issues. Best is just to use the petcock and its filter, which is also easy to access.
@WWrides The internal diameter ishould be 5,5mm. I've looked in all CB350F parts lists, but - contrary to the CB500 ones - the length is not specified. Others here may know. The length should be thus, that there's no risk of kinking. No uphill routing, blocked air will impede fuel flow.
You're almost there. My friend had a CB350F. Lovely and ultra reliable bike which happened to be Soichiro's favourite.

WWrides · « **Reply #26 on:** November 13, 2023, 03:09:56 AM »

Very helpful, thank you. Unfortunately, it looks like the proper petcock is currently unavailable on CMS. Any other suggestions on where I might find it?

WWrides · « **Reply #27 on:** November 13, 2023, 04:06:22 AM »

@grcamna2 the condition of my tank is very good. No rust. The previous owner cleaned it out and treated it. When I disassembled the petcock, the screen filter was fairly clean. So I don’t think there is a need for a paper filter.

The main issue I’m having is using the existing petcock and getting the new fuel line to run properly. Another idea I had was to cut the nipple shorter (it seems pretty long) to give me a little extra space for the fuel line to route down and in front of the first carb. OR, maybe I can find a 90° attachment for the nipple and run the new line off of that?

newday777 · « **Reply #28 on:** November 13, 2023, 04:16:02 AM »

Get on the request list at David Silver Spares in PA, they buy up NOS part lots and might get one at some point.

https://www.davidsilverspares.com/parts/by-part-number/part_16957333025/

newday777 · « **Reply #29 on:** November 13, 2023, 04:25:54 AM »

Call south sound honda and have them run a dealer search on the part numbers to see if one is in stock at an old dealer. They will give you the dealer's phone number to contact them and get it shipped to you.

https://www.southsoundhonda.com/--xpartsstream#/s/HOM//16957-333-025//1/y

All other avenues I know of don't have one.

https://www.southsoundhonda.com/--xpartsstream#/s/HOM//16957-333-025//1/y

newday777 · « **Reply #30 on:** November 13, 2023, 04:27:03 AM »

Otherwise find a good route for the fuel line as I said earlier.

lash · « **Reply #31 on:** November 13, 2023, 05:53:23 AM »

Quote from: WWrides on November 12, 2023, 11:54:44 AM

Okay, a good step forward, but have run into another issue. I removed the filter and connected the existing tube to the petcock after cleaning it out. I was easily able to start it up, and it ran with no issues for a good 10 minutes. Yay!

Unfortunately, it looks like I may not have the original petcock on it because the the fuel nipple is facing down and causes the fuel tube to get pinched if I try to put the tank back on all the way in this configuration (see pictures). Any suggestions?

I also really need to replace the fuel line, but I cannot figure out how to connect the new one to the carb inlet (it seems very difficult to reach and get a clamp around.

Looks to me from the pics that the petcock is from a 750 and you have one outlet blocked with a cap. Plus the fuel line is crimped which is not good.

WWrides · « **Reply #32 on:** November 13, 2023, 08:55:33 AM »

So, as I wait for the proper size fuel line to be shipped to me, I wanted to do two other things that I have not done before. If you know of a good YouTube link that would be helpful, please let me know:

1. Empty my fuel tank (just to make it easier to install the new line when it comes)
2. Change my oil

grcamna2 · « **Reply #33 on:** November 13, 2023, 09:38:36 AM »

WWrides,I'm glad the fuel tank is rust-free? which is amazing for the age of these tanks:you mentioned the previous owner had worked on that.

The original fuel valve/petcock is part#16957-333-025. I recommend looking online and use that part# for the search;you may find one yet.

I have also purchased good,used correct stock petcock/fuel valves before and replaced the inner rubber seals. I have had one on my Honda now for7 years with no leaks.

newday777 · « **Reply #34 on:** November 13, 2023, 09:45:11 AM »

To empty the tank. I use a big fuel funel(w/brass screen) in a fuel jug and carefully tip the tank to pour out through the lid(unless your tank is full? You can get a fuel transfer pump to get most of it out of the tank while it's in place if needed.

newday777 · « **Reply #35 on:** November 13, 2023, 09:56:32 AM »

Oil change

https://support.common-motor.com/hc/en-us/articles/4407878182553-How-to-change-the-oil-and-oil-filter-on-the-Honda-CB500K-and-CB550

WWrides · « **Reply #36 on:** November 13, 2023, 11:29:26 AM »

Thank you @newday777!

Don R · « **Reply #37 on:** November 13, 2023, 12:16:39 PM »

They didn't mention using a six-point wrench on the oil filter housing bolt, often they are overtightened and stuck. With the standard bolt it is easy to round off the hex with a 12 point socket or wrench.

Redline it · « **Reply #38 on:** November 13, 2023, 02:51:46 PM »

Not to distract the train of thought here for the solution, but the inside tank filter if gone or repaired too many times,when in a pinch, a trip to the grocery store can work, a garlic bag, the little tubes that hold 5 or 7 whole garlic in line, fine mesh, red works and crazy glue, drop the filter insert into the bottom corner of the new garlic bag make a cut straight up to just over the factory heat seal mark either over lap or pinch together wrap it around tight like the stock one is or was. And crazy glue it in place Ten yrs on the one putt in, so far so good..

WWrides · « **Reply #39 on:** November 14, 2023, 03:30:42 AM »

Found this petcock on EBay, but I’m a little hesitant to purchase from them. Anyone have any thoughts? https://www.ebay.com/itm/185951153385

newday777 · « **Reply #40 on:** November 14, 2023, 03:55:26 AM »

Quote from: WWrides on November 14, 2023, 03:30:42 AM

Found this petcock on EBay, but I’m a little hesitant to purchase from them. Anyone have any thoughts? https://www.ebay.com/itm/185951153385

That is similar to yours isn't it? It has the downward outlet, just shorter.
If your petcock is working properly then try to rig a 90° outlet. The brass is pressed in so measure the size and see what you

newday777 · « **Reply #41 on:** November 14, 2023, 04:37:11 AM »

Hmmmm....thinking cap going off....
Maybe you can get a compression brass union elbow to work on your outet, add a short brass 5.5mm tubing out the other side of the elbow? It's not stock as your bike came with but could possibly work unless you want 100% original for showing in sanction events??

This 90° union elbow is from England in 5mm so you would have to thin down the 5.5.5mm to 5mm.

https://tameson.co.uk/products/fl2e-o-b-05-5mm-brass-90-deg-elbow-compression-fitting-150-bar-din-en-1254-2

WWrides · « **Reply #42 on:** November 14, 2023, 05:08:07 AM »

2 questions regarding replacing the petcock:
1. This looks like it will fit. It does not have the secondary screen on the bottom of the petcock bowl, assuming the tank is okay, can we use this?
1a. Alternatively, should we use it with an inline sintered bronze filter?
Fuel Valve Petcock Tank Switch for Honda 1970-1976 CB100 CL100 SL100 XL100 CB125 CL125 SL125 XL250 XL350 16950-107-005 https://a.co/d/bqyFNrP
2. Just because we have one with an oval mating surface, does it mean we need to stay that way, or can we switch to one with a visible bolt?

BenelliSEI · « **Reply #43 on:** November 14, 2023, 05:38:29 AM »

Quote from: jonda500 on November 12, 2023, 08:01:19 PM

I can't be the only one who believes that with the inline paper filter removed fuel will happily flow through the fuel line as long as it doesn't run above the fuel level in the tank - even if it goes up down, up down, around the barrels, under the engine and back up to the carbs.
John

John….. not popular theory, but I agree. The goal should be to keep the hose short and as direct as possible, with no chance of a kink.

newday777 · « **Reply #44 on:** November 14, 2023, 05:39:42 AM »

Quote from: WWrides on November 14, 2023, 05:08:07 AM

2 questions regarding replacing the petcock:
1. This looks like it will fit. It does not have the secondary screen on the bottom of the petcock bowl, assuming the tank is okay, can we use this?
1a. Alternatively, should we use it with an inline sintered bronze filter?
Fuel Valve Petcock Tank Switch for Honda 1970-1976 CB100 CL100 SL100 XL100 CB125 CL125 SL125 XL250 XL350 16950-107-005 https://a.co/d/bqyFNrP
2. Just because we have one with an oval mating surface, does it mean we need to stay that way, or can we switch to one with a visible bolt?

That won't work on your tank. That one only has a single screw mounting as compared to the 2 screws on yours.

WWrides · « **Reply #45 on:** November 14, 2023, 07:16:39 AM »

Thanks @newday777. I didn't notice that.

WWrides · « **Reply #46 on:** November 14, 2023, 07:17:51 AM »

Quote from: newday777 on November 14, 2023, 04:37:11 AM

Hmmmm....thinking cap going off....
Maybe you can get a compression brass union elbow to work on your outet, add a short brass 5.5mm tubing out the other side of the elbow? It's not stock as your bike came with but could possibly work unless you want 100% original for showing in sanction events??

This 90° union elbow is from England in 5mm so you would have to thin down the 5.5.5mm to 5mm.

https://tameson.co.uk/products/fl2e-o-b-05-5mm-brass-90-deg-elbow-compression-fitting-150-bar-din-en-1254-2

Ugh. This seems a little too complicated. I was really hoping for a simple fix. Is there really no alternative petcock that is similar?? That seems crazy to me!

grcamna2 · « **Reply #47 on:** November 14, 2023, 09:12:29 AM »

I recommend doing an exhaustive search for an NOS original Honda fuel/petcock using the part# I provided,eventually you will locate one.
The other option is to find a decent used orig. stock Honda valve for your 350F and rebuild the rubber parts inside it.

grcamna2 · « **Reply #48 on:** November 14, 2023, 09:26:24 AM »

Quote from: newday777 on November 14, 2023, 04:37:11 AM

Hmmmm....thinking cap going off....
Maybe you can get a compression brass union elbow to work on your outet, add a short brass 5.5mm tubing out the other side of the elbow? It's not stock as your bike came with but could possibly work unless you want 100% original for showing in sanction events??

This 90° union elbow is from England in 5mm so you would have to thin down the 5.5.5mm to 5mm.

https://tameson.co.uk/products/fl2e-o-b-05-5mm-brass-90-deg-elbow-compression-fitting-150-bar-din-en-1254-2

I like this thinking.
The present petcock which WWrides has on the tank now can possibly be modified and even adapted to work with a single outlet.
A small brass tube can be grafted/soldered-on by a qualified person(retired plumber,etc.)to be made into an elbow(using another part that will match the size of what's on there now)and then problem solved.
A used petcock(or what's on there now,OEM stock quality?)can be modified to work and then be used for a long time,and when it finally wears out,new rubber parts can be installed to restore it internally for many years to come;do you know of a person who is good at soldering ?

I prefer good quality stock Honda manual petcock/fuel valves.

I think having a used/parts Honda petcock to cannibalize may help..

WWrides · « **Reply #49 on:** November 14, 2023, 10:20:26 AM »

Quote from: newday777 on November 13, 2023, 04:16:02 AM

Get on the request list at David Silver Spares in PA, they buy up NOS part lots and might get one at some point.

https://www.davidsilverspares.com/parts/by-part-number/part_16957333025/

Matt from David Silver Spares got back to me and said that there is not another fuel tap that is close or the same as the original. He didn't really give me any other suggestions.

News:

Author Topic: Hesitation and Stalling Issue (Read 2110 times)