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Old 07-14-2012, 09:50 AM   #1
itrack OP
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Joined: Jun 2012
Location: South Texas
Oddometer: 114
Yamaha IT200 Questions

After work today we are heading North five hours and then riding in a state park tomorrow. My buddy wanted to come along so he snagged a cheap IT200 off craigslist last night. We will eventually be rebuilding/refreshing it. For the moment thought I have it in the back of my truck and can tinker with it while at work before we head out.

On to the problem. The owner stated that it the idle runs away when cold but once warmed up it idles fine. His solution was to roll start it and keep it in gear until warmed up. I noticed that the carb has a missing hose . What should I check first and how. Just looking to make it through Sunday riding it before we tear it down. Thanks for the help and here are some pics.







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Old 07-14-2012, 12:36 PM   #2
stainlesscycle
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Location: morgantown, wv
Oddometer: 2,222
air leak potential: base gasket, head, reed/intake boot, boost bottle+hose, carb top, right side crank seal.

if it idles down, once hot, i'm guessing the air screw setting/or pilot size could be an issue. the missing hose is an overflow. rebuild the carb, and see if it goes away...

they're pretty dang reliable, and my favorite of the it smaller bores. lotsa grunt outta that little motor.
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Old 07-16-2012, 01:53 PM   #3
itrack OP
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We sealed up all the places air could leak with rtv, epoxied the gas tank leak, and cleaned the carb. Had a great time riding some really tight trails that had clay, roots, sand, logs, water, mud, etc. It was an absolute blast. Only problem was that at the half way point we killed the bike and it wouldn't restart. We changed the plug and the old one was fouled. Our two stroke mix was 32-1, is there a way to prevent fouled plugs on trails were you are only going 5-10mph? The bike also doesnt want to start off the kick start but will easily fire off a roll start.

Jake












itrack screwed with this post 07-16-2012 at 01:58 PM
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Old 07-16-2012, 08:56 PM   #4
stainlesscycle
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Location: morgantown, wv
Oddometer: 2,222
i run 40:1 amsoil, no airbox lid, dg silencer, stock pipe ( i've cut it open and removed the baffling), stock timing, 340 main, 55 pilot. boyesen reeds. if it will bump but not kick, that's usually rings or reeds..................... plug should be b9 or 10 even... never fouled a plug.. float height is 23.5mm

i smear seal-all on the tank leaks, works pretty good... the tanks do crack pretty badly.

i have all the manuals, including race prep and tuning and wrench report - pm me if you need them.

oh and i remove the top engine mount - lotsa stories about cracked cylinder bases if you leave it on.

awesome motor, just has that funny down shift stutter/pause that only the it200 has.
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current bikes
07 gasgas xc300-94 duc 900ss-86 morini camel (2)-84 IT200-83 IT175-78 guzzi lm1-77 pursang 250-76 morini 3 1/2 strada-76 frankentaco pursang 200-74 frankentaco pursang 200-74 morini 3 1/2 sport-74 mz ts250/0-74 puch 175 (3)-73 can-am 175tnt-71 guzzi frankeneldo-71 ossa Stiletto-70 frankentaco sherpa s(2)-66 morini corsarino(2)-63 morini corsaro + many more

stainlesscycle screwed with this post 07-16-2012 at 09:01 PM
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Old 10-08-2014, 11:41 AM   #5
itrack OP
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Just an update. She has been through two different buddies and now belongs to me. Lots of work has been done and just fresh plastics and rebuilt suspension is left. Thought you guys might like to see pics of her 2+ years later. Easily my favorite bike in the stable.



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Old 10-08-2014, 07:24 PM   #6
Fiftygrit
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I had 2 of these way back when, they were a hoot, the boyeson reed`s did help the power band.
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