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British & European Bikes, Build Threads & How-To’s Build threads, tech Q&A and conversations centered around custom-built motorcycles from the UK and Europe

 
 
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Old 07-18-2012   #1
 
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wstdtlnt

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Join Date: Mar 2011
Posts: 11
Bonny ain't firing

Hey guys,

First and foremost, some details:

1969 TR120 Bonny 650 with a 750 bore kit
Dual Amal 930's with 200 main, #3 slides and 106 needle with the clip on the middle notch. No air filters just mesh velocity stacks.
Straight pipes with an agressive upsweep, no muffler or baffles
Pazon electronic ignition.

So i did a bunch of work over the winter (mostly aesthetic) but also threw two brand new carbs in, a new pazon and reset the valves gaps. I had it running pretty decent but a tad rich. So my first question is can anyone recommend a good jet and notch set up given the bike?

New problem. I ran it for about a week with it firing on pretty much first kick when it was warm and 2 or 3 when cold. Then one day it fired normally in the morning and after work about 4 hours later it took me about 20 kicks. Rode it for about 30 mins, let it sit for about 2 hours then 100 kicks later, I still had nothin but wet t-shirt and a sore foot.

Plugs were pretty sooty, so I threw new ones in which didn't do anything. Then pulled them and held to the heads with both having spark so doesn't seem to be an ignition problem. Battery is reading 12.2 with all lights working and bright. checked my connections and fuses and everything seems to be okay. Double checked and re-did my static timing to 38 BTDC with still nothin.

Then i noticed a had a pretty big air bubble in my fuel line so I started looking at my carbs. Process of elimination led me to my second carb not letting too much fuel through. When I pull my transfer line (between carbs but leaving it hooked to my right carb) and turn on the petcock, fuel flows as it should. When i hook the left carb back up, turn the petcock to on, It doesn't let much fuel get down to the carbs. I pulled my banjo and bowl on the left carb to check for clogging in them and all the jets and they're clean as whistle as its only had a week of running. then i threw a banjo from another carb on there which seemed to let more gas through so i figured that might help. When i go to kick the bike, I get heavy kick back with the throttle slightly open and gas spits out of the back of the carb. The bowls are both full and it seems like there should be enough fuel to at least fire the bike.

Anyway i'm at a total loss now so i thought i would put out the mayday call. Holy, I apologize for the novel! Any help would be great!

Cheers
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