1996 S1 Carb Swap to HSR42. Help Needed

[SparkS1]

I have recently swapped over the stock carb to the HSR42. I cannot for the life of me get it to hold an idle. It will start and I can run the throttle up with ok response but I am focusing right now on trying to get it to idle. All settings on the carb are from the factory. Any pointers or help is greatly appreciated. Thanks in advance.

 

[konarider94]

I haven't started my s1 since I bought the hsr42. Its in project form. But I do remember the mikuni manual it came with had a very good troubleshooting/tuning guide.

 

[SparkS1]

I used the tuning and troubleshooting and it will not idle. If the choke is pulled out it will, but once the choke is closed off it will die. [confused]

 

[d_adams]

Was it used or new? Sounds like the pilot jet circuit is partially clogged.

 

[SparkS1]

It is a new Mikuni HSR42 kit that I purchased with air cleaner. The bike was used with he stock CV carb. Could the new pilot jet that was installed in the kit be wrong? I wouldn't think so, but I have seen weirder things. Thanks

 

[d_adams]

Very possible. I've not worked on a tuber, but I've been around carb'd bikes for a long time. Where did you get it from?

 

[SparkS1]

It is from Force Motor Products. It is the Forcewinder kit which was a carb, airbox and all needed adapters.

 

[d_adams]

3 things will affect the idle. Pilot jet size, float height and the air/fuel mixture screw. Well, 4 if you count the actual idle speed screw. I assume you've screwed the idle speed screw in some to raise the idle?

Looked at a pic of one, on the left side in the front is an adjustment screw, that's probably the air/fuel mixture screw. If memory serves, it should be 4 turns out (as a starting point) from a light seat since it's on the filter side of the carb. Check the manual that came with it, it should tell you where to start at.

 

[SparkS1]

The adjustments it said in the book were the Pilot air screw, 2 turns out which I did and also the accelerator pump adjuster screws which was 2/3 to 3/4 adjustment. Maybe I am missing something.

The 2/3 to 3/4 was throttle engagement. It determined the start of the throttle and the end of the push on the pump rod.