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Makotosun

Hard Starting IT200 - 1984

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Hard Starting IT200 - 1984 was created by rossbotha@gmail.com

Hi, I battle to kick start my bike. It starts easily using a drilling machine on the rotor. What I've done.
  1. New carb. Cleaned it after installing the new Clarke tank.
  2. Rebore with new piston and rings. Compression 75psi.
  3. Ignition is HPI. The timing is correct. Good spark.
  4. Once running it idles well.
I don't know what else to do other than clean the jets again. The carb was overflowing, now that's fixed. Some debris in the seat.

Any suggestions?
20 Feb 2024 06:28 #1

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Replied by pahiker on topic Hard Starting IT200 - 1984

Does this carb use a starting circuit and not a choke? If so, did you confirm the passages are clear after your carb was cleaned? Is it only difficult to start when cold? If so, try putting it in 2nd gear, engage the starting lever, rock it back and forth 10 times to pull in mixture then put it in neutral  and give it a good kick. My larger 2 strokes responded well, but you usually don't need to do this on a smaller bike.
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20 Feb 2024 07:21 #2

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Replied by MarkT on topic Hard Starting IT200 - 1984

I find it remarkable that you are able to spin it at all with the spark plug installed, and even start it, with a drill motor. 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
20 Feb 2024 07:56 #3

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Replied by darinm on topic Hard Starting IT200 - 1984

Did you verify the jet sizing on the new carb? They are probably the wrong size if it's a cheap Chinese replacement. I remember my IT200 having a choke and starting cold in 3-5 relatively easy kicks.
1972 Yamaha CT2 175
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20 Feb 2024 13:19 #4

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Replied by rossbotha@gmail.com on topic Hard Starting IT200 - 1984

It's a Mikuni carb. Original. I'll check the jet sizes.
21 Feb 2024 00:02 #5

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Replied by rossbotha@gmail.com on topic Hard Starting IT200 - 1984

The drill struggles to get it going. Not cordless drill. Once it gets over the compression stroke it spins.
21 Feb 2024 00:03 #6

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Replied by MarkT on topic Hard Starting IT200 - 1984

Make sure when kicking you aren't twisting the throttle open. Opening the throttle makes the starting circuit ineffective. (You probably aren't touching the throttle when using the drill)
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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21 Feb 2024 11:30 #7

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Replied by rossbotha@gmail.com on topic Hard Starting IT200 - 1984

The jet sizes are as follows:

main jet 260.
Pilot jet 35.

According to the manual main jet #330. Pilot jet #55.

It starts so easily with the drill. Choke and no throttle.
22 Feb 2024 06:52 #8

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Replied by MarkT on topic Hard Starting IT200 - 1984

It's easy to have a habit of twisting throttle while kicking without even realizing it which is why I mentioned it.

The two jets you mentioned are significantly different in your "new" carb, which doesn't make a lot of sense unless it's not actually new or not specifically for your bike?  In any case, there are more calibrated parts in the carb that work together as a system... venturi size,  needle and needle jet, and slide cutaway differences can make a difference in main and pilot jet requirements.  In other words, good idea to check all the calibrated parts, not just a couple of them.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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22 Feb 2024 14:27 #9

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Replied by Knutco11 on topic Hard Starting IT200 - 1984

Correct me if I'm wrong, but shouldn't that engine make at least 110 to 125 psi of compression? If so, I'd test with another compression tester. I've had certain compression testers read low like that on small engines. Other engines I've worked on were truly low, and would refuse to start unless I spun it up with a drill, or push started it. Does sound like compression is low to me.
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23 Feb 2024 13:22 #10

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