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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: View topic - 74 suz ts250


74 suz ts250
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05c50
Full Throttle
Full Throttle


Joined: Oct 26, 2007
Posts: 2868
Location: Greensburg Pa

PostPosted: Wed Jun 07, 2017 8:08 pm    Post subject: Reply with quote

patrick wrote:
i always have the choke closed when i start it. you use the word circuit.all i can think about is electronics.how do i repair the choke circuit?thanks


The THROTTLE should be closed when attempting to start it. The circuit that I'm referring to is the path that the fuel takes from the bowl to the throat of the carb. These carbs don't actually have a "choke". A choke is usually a butterfly valve that chokes off the air flow and causes an over rich fuel mixture. These carbs use a starter valve that is lifted off a seat and allows extra fuel to flow from the bowl to the throat. There's a very small orifice in the bowl where the fuel enters the starter valve "circuit". It's not uncommon for that orifice to be plugged and cause hard starting.

......Paul

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patrick
Weekend Warrior
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Joined: May 20, 2017
Posts: 10

PostPosted: Thu Jun 08, 2017 2:42 am    Post subject: Reply with quote

i can take it apart again,but i'm sure i cleaned out every orifice.it seems the only way to get it to start is with the throttle open,but i'll try again.thanks
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05c50
Full Throttle
Full Throttle


Joined: Oct 26, 2007
Posts: 2868
Location: Greensburg Pa

PostPosted: Thu Jun 08, 2017 7:43 am    Post subject: Reply with quote

Here's an image of a float bowl that shows the "enrichening tube" in a float bowl. https://www.google.com/search?q=suzuki+carburetor+float+bowl+image&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjZkt6Suq7UAhVGrD4KHbF-DtUQ7AkIQA&biw=1366&bih=662#imgrc=cJlPRaOva2r2GM: Yours may not look exactly like it, but it will be similar. The fuel enters the bottom hole and flows up the tube to the starter valve. Be sure that this passage is clean and spray carb cleaner in it.

.......Paul

_________________
�77 CB550f
�77 CB750a
�78 GL1000
�80 CB650c
�75 GL1000-finally finished
�79 KZ200
68 CB450K1-taking up all my time
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Rizingson
Gear Head
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Joined: Oct 30, 2009
Posts: 1779
Location: Parker, CO

PostPosted: Thu Jun 08, 2017 8:03 am    Post subject: Reply with quote

Opening the throttle while starting a cold 2-stroke, is one of the most common mistakes users make. Paul has explained the process correctly. In order for the engine to draw fuel through the starter circuit, it must be able to pull a vacuum through that circuit. If the throttle is open even slightly, all the vacuum potential is lost through the air intake. Even with the throttle closed, the throttle slide is still open just a bit, like it would be when you are idling without the enrichment circuit.
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patrick
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PostPosted: Mon Jun 12, 2017 4:23 pm    Post subject: Reply with quote

i cleaned out the enrichment tube and sprayed carb cleaner in it,and cleaned the spark plug(didn't need it,but why not?)also,took off the bowl on the petcock.it looked like it had a disintegrated piece of foam rubber in it.is there supposed to be a filter in there?cleaned it out.also,when i push down the "choke"it popped back up some,so i made a clip to keep it completely closed.started,without throttle,in 5 kicks!thanks again for all your help.
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05c50
Full Throttle
Full Throttle


Joined: Oct 26, 2007
Posts: 2868
Location: Greensburg Pa

PostPosted: Mon Jun 12, 2017 5:02 pm    Post subject: Reply with quote

I'm pretty sure that there should be a very fine screen in the petcock bowl, but not a filter.

..........Paul

_________________
�77 CB550f
�77 CB750a
�78 GL1000
�80 CB650c
�75 GL1000-finally finished
�79 KZ200
68 CB450K1-taking up all my time
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View user's profile Send private message Visit poster's website
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