RZ/RD 350 & Misc. 2-Stroke Tech BBS

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PostPosted: Fri Aug 11, 2017 9:43 pm 
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Mikuni 26 carb's, mains 230/pilot 27.5/needle stock setting (middle) on Micron pipes. Using 94 Chevon octane with Amsoil Interceptor at 40;1 ratio. Pulled the pugs(ngk br8es), after 500kms and they still look too far on the rich side although on the porcelain I do see a hint of dark chocolate color. Should I go to 50:1 (with Amsoil apparently you can) or lean it out with the needle at which setting? Side note: she does pull at 6000 nicely but it appears there is more according to the colour.


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PostPosted: Fri Aug 11, 2017 10:02 pm 
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Location: Calgary, Alberta, Canada
Your porcelain has to be read way down. Looks really rich. Try raising the needle by dropping the clip one notch.

Edit:dropping the needle by raising the clip one notch.

One thing at a time without the dyno, only one.

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Last edited by hondaror on Sat Aug 12, 2017 3:16 am, edited 2 times in total.

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PostPosted: Fri Aug 11, 2017 10:10 pm 
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That's not oil on the plug-it's fuel. She's fat. Start with the pilot and work up to the main. Go easy and buy a box of plugs. Too bad yer way over there. I have a nice dyno cell at my disposal.

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PostPosted: Sat Aug 12, 2017 1:36 am 
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Considering what it took to get to this pt, a box of plugs is an easy investment. Now a dyno cell - thats not an easy investment fm what I note on youtube. Just started driving her to work this week: no issues starting first kick with the choke out then idling down to 1100-1200rpms. Never practiced chopping plugs b4 but I'm teachable and got a hacksaw hanging on the shop pegboard. Agreed, she's running way fat; time to make her lean (er) n' mean - meaning, I'm impressed with the current power band but frankly I can't imagine what she'll will be like once light tanned plugs occur - I'm imaging a scary ride however in a good way. Off to Lordco in the AM to see if they have any br8es's left - cheaper than Cnd Tire.


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PostPosted: Sat Aug 12, 2017 3:15 am 
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Scott, 1UA's? Get B9ES's, 31K-B8ES's.

Plug chops are only for your main jets.

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PostPosted: Sat Aug 12, 2017 1:35 pm 
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Bought a box of B8ES (10) @ $36 so I have 5 opportunities to dial in to start. I have main jets fm 160 to 240. The lowest I've got for pilots is 25. Plugs arrive tomorrow. I'll start with the needle adjustment first then move on to the jets for this trail and error adventure (rural solution - no dyno).


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PostPosted: Sat Aug 12, 2017 4:05 pm 
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no point in checking plugs afer 500km's, as you only diagnose the last 100 meters the engine was running. to use plugs as a diagnose, you need to run a specific situation like WOT, cut the engine and pull the clutch, stop and immediatly check the plug. than you have an idea if the main jet is ok.

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PostPosted: Sat Aug 12, 2017 5:54 pm 
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If they are 4L0 -01 carbs with genuine nozzles then the correct pilots are 22.5. How many turns on the air screw are you?

Obvisously a different part of the world but here in the UK a 22.5 pilot is pretty rich on an LC and no need to go bigger even with a fair bit of tuning.


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PostPosted: Sun Aug 13, 2017 10:25 am 
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You should be running BR9ES plugs. The BR8ES are too hot for the RZ. Possible head damage can result.

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PostPosted: Sun Aug 13, 2017 12:25 pm 
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You sure about that?
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PostPosted: Sun Aug 13, 2017 3:17 pm 
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The manual states NGK B8ES. Yes 22.5 is correct for the pilot but I was having toubles with starting her with this size; 27.5 appears to be the one that works interestingly. Might have something to do with the Microns - don't know. Again it 27.5 could be causing the fatness on the spark plugs but she starts no problem. So, whats the proper proceedure for plug chop other than the last 100 meters matter?


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Last edited by LC Cnd on Sun Aug 13, 2017 8:44 pm, edited 1 time in total.
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PostPosted: Sun Aug 13, 2017 4:06 pm 
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They always start easy fat. Try a 25?

IMHO the resistor plugs work just as well as non-resistor with the benefit of not screwing with ignition or nearby radios. I've had racebikes with MSD ignitions,copper wires and non resistor plugs screw with the computer bad enough it aborted dyno runs.

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PostPosted: Sun Aug 13, 2017 8:20 pm 
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Raised the needle one notch and the bike would bogged out on acceleration. Start up was also difficult. The only time acceleration or start up work was when I engaged the choke.


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PostPosted: Sun Aug 13, 2017 11:40 pm 
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Update: change all jets and carb settings all to stock spec to baseline this matter and got the new spark plugs. Read on RDLC Crazy that stock specs work fine with aftermarket pipes. Start up was fine. Went for a test run this evening - did not note any dif between the 220 and the 230 mains regarding the power band. Whats next to make her run less rich?


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PostPosted: Tue Aug 15, 2017 1:22 pm 
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Temporarily(?) remove the airfilter box's cover .


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