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Post by muckyal on Aug 10, 2013 19:21:07 GMT 1
stripped my carbs. trying to get them back to standard but my powerjets are 55right and 50left. manual states 65left and 60right. as yamaha dont list the jet for sale, if I cant source new correct sizes would anyone recommend using 55left and 50right and going UP on main jet from 185 to 195 to compensate for "10" lost in powerjet?  ? |
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Post by jimz on Aug 10, 2013 19:44:16 GMT 1
I run a 350 r with Lamos gp replica pipes (sounds lovely!),the power jets are standard,the mains are 220's,the needles set 1 up from standard,and it runs a treat.No real flat spot at bottom end,just point and squirt.No issues starting from cold.I hope this helps....
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Post by muckyal on Aug 10, 2013 19:49:03 GMT 1
happy yours runs well but mine is near as standard which is where I want it.
what im wondering is as my powerjets are slightly smaller can I compensate by upping the main so the overall volume of the two combined matches standard figures
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Post by flames on Aug 11, 2013 12:32:27 GMT 1
ive heard that the powerjet and main jet should add up to be the same size as the main jet would be on a non powerjet carb.so you could probably compensate,but it probably wont run as sweet as standard.powerjet only cuts in at wide open throttle apparently?
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Post by muckyal on Aug 11, 2013 12:50:03 GMT 1
so im guessing upping would make full throttle fuel flow correct
but midrange would be slightly rich which I could possibly play with lowering the needle one clip???
thoughts people.
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Post by muckyal on Aug 11, 2013 22:30:19 GMT 1
no one know?
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Post by jimz on Aug 12, 2013 20:22:47 GMT 1
You could try it,if you end up with a flat spot at bottom end of rev range,then try either lowering the needles or try a smaller mains.That should getbrid of flat spot.In my experience,if you are running standard pipes and air box,depending on the carbs (if you are running miks),the larger the mains,the larger the flat spot at bottom end.So it could be a case of playing with the jetting until you are happy.As an after thought,have you tried having the carbs sonically cleaned?.
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Post by swifty on Aug 13, 2013 23:29:26 GMT 1
HI I have a set of powerjet carb were cleaned and boxed 14 years a go . just looed at them today in great contion main jet is 180 .Might be of some use .Thanks DAVE G.
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Post by mellow on Aug 13, 2013 23:45:38 GMT 1
Are your carbs 1UA00's? If so mains should be 185 & left powerjet 65 and right 60. That would mean 250 total on left and 245 on right. If they are later powerjet jet carbs that may be why they are 50 & 55  |
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Post by swifty on Aug 13, 2013 23:53:37 GMT 1
is that number on the carbs, the Haynes manual said rd350R
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Post by muckyal on Aug 14, 2013 7:28:09 GMT 1
hi. my carbs sau 1ua 10 on them.
I know previous owner said the bike had 31k carbs fitted so he bought powerjets instead. has he bought 350r carbs??
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Post by muckyal on Aug 14, 2013 7:30:33 GMT 1
swifty/dave g.
whar do u want for your carbs and what model are they? 1UA 00/10 etc?? cheers
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Post by flames on Aug 14, 2013 8:17:18 GMT 1
homepage.ntlworld.com/ultimatelccrazy/dunno if that works as a link,if not copy and paste into your browser.it tells you some of the differences between the models. fII had powerjet carbs,but I thought the fII used the same engine as 31k? pipes are different and maybe why the jetting change.
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Post by muckyal on Aug 14, 2013 9:04:48 GMT 1
yeah its a weird one. my carbs say 1ua 10. powerjets are unavailable too! I just wanna put it all back to standard. thatd do for me.
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Post by midlifecrisisrd on Aug 14, 2013 11:53:28 GMT 1
1ua 10 carbs are from the later f2 and unlikely the pj's have been changed.
I would just fit them with the 185 or 195 mains as the power jet is only for wide open throttle and most strokers are rich which is probably why they have been reduced for emissions.
haynes manual is not to be trusted, they state jet sizes but as you have found they are not the same. i too have found 1ua carbs with 180 mains as standard and 31k carbs from imports with 230 mains as standard.
As long as your total is 230 - 240 you will be fine.
steve
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Post by muckyal on Aug 14, 2013 12:47:30 GMT 1
I have 185 mains.
55/50 powerjets.
carbs are 1ua 10's
bike is down on power. runs ok starts ok. ticks over ok. but does 98-100mph at a push.
wheres my top end???
tryin to put all to standard.
my carbs had airscrew at 1 1/4
and 3rd clip on needle.
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Post by midlifecrisisrd on Aug 14, 2013 15:31:41 GMT 1
I have 185 mains. 55/50 powerjets. carbs are 1ua 10's bike is down on power. runs ok starts ok. ticks over ok. but does 98-100mph at a push. wheres my top end??? tryin to put all to standard. my carbs had airscrew at 1 1/4 and 3rd clip on needle. do you know any history of the motor? with that jetting i would not think it is the jetting, i'd be looking at compression and whether both power valves are fully opening. what milage is on it and have the pipes been de coked? steve |
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Post by muckyal on Aug 14, 2013 18:46:07 GMT 1
ok its been a while. ...
firstly whats best way to de coke exhausts?
secondly what sort of psi should I be getting from each cylinder?
now for powervalves....when ignition is turned on they do the setting thing. ive also observed through ex ports they work together. when running ive observed them starting to work at around 7000rpm and the pulley seems to be in right position when stopped ie where I can put drill bit in pulley etc.... any more ideas???
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Post by steeley on Aug 14, 2013 19:26:34 GMT 1
muckyal ,it sounds like you have 350r carbs there .lc 2 31k ran non p/j carbs.i have a 350r running lomas pipes with std airbox which has been supposedly set up on a dyno ,I will dig any paperwork out to see what jets are in it.
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Post by muckyal on Aug 14, 2013 19:43:25 GMT 1
hi.
my bike is def a 1wt 1987 f2.it should have powerjets but with
185 mains. (it has)
65/60 powerjets (has 55/50)
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