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need carb; carburettor 394 engine
Tweet Topic Started: Nov 28 2014, 03:16 PM (83 Views)
jdj2 Nov 28 2014, 03:16 PM Post #1
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Carburettor required after buying crap off e bay that will not run the bike many thanks
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Speed Nov 28 2014, 09:25 PM Post #2
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you might be bale to cobble up old bits and new bits to make one good one, maybe mark G could help if you contact him
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sidewayscarl Nov 29 2014, 12:17 PM Post #3
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http://www.ypvspares.com/Yamaha_FS1E_16mm_Carburettor_Cable_Choke/p1208263_5518040.aspx

I have just fitted one of these, but I am not going to let the old one go until I have tested the new one and know it is OK !
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mech73 Nov 29 2014, 06:22 PM Post #4
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The pattern carb I fitted a number of years ago is still working fine, but had to be completely rejetted. The main jet was marked 150, but was visibly too small and the pilot jet was undersized as well.

The pilot jet from the original carb was a straight swap, but the main jet was a different thread. I had to fit one of the round slotted mikuni jets rather than the standard small hex type. I could have swapped over the whole needle jet assembly, but that was one of the bits that was badly worn.
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sidewayscarl Nov 30 2014, 09:41 AM Post #5
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Martin at YPVS is aware of the jetting issue and modifies the carbs to accept a standard Yamaha jet which he fits to the carbs before he sells them.
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mech73 Nov 30 2014, 04:51 PM Post #6
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My pattern carb wasn't from YPVS and was bought in 2007, but the origin may be the same of course.

The original mikuni hex jets are 1BA, which strangely is an imperial thread. The pattern needle jet was threaded metric M5 x 0.75 to accept the main jet. Which is close to 1BA, but not quite enough.

The mikuni round jets are M5 and fit ok. However to add to the confusion they are sized differently. Hex type is measured by flow rate and round type by diameter.

Allens Performance chart suggests a 150 hex jet is approximately equivalent to a 105/110 round jet.

I played safe and started big, reducing size until the bike ran clean. I think I ended up with a 115 fitted.

http://www.allensperformance.co.uk/jetsizeconv.html
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