1150 carbs on an 1100

[Kris V]

We never disturbed the cylinder and the walls still had a good hone on them.

 

[Steveb64]

gday bill, i run a gsx11et, 1135 yosh pistons,98cfm flowed head,1mm bigger inlets,black motor cams,36mmcvs, later model standard airbox with kn filter,after much riding on road,track and dyno runs,we found the best combination of jetting was,please remember this is an aussie specs bike, we first ran the standard 36mm jets, and found that this ran the bike to rich all thru the range,we then put the 34mm, jets in the 36mm carbs and straight away it ran cleaner, in the end the combination was 120mikuni mains, standard 36mm pilots from memory 47.5mm, standard 36mm carb airjets 160s, 2.5 turns on the mixture screws, needle set in the middle notch, piont to note when you screw in the mixture screws dont do them down tight, as you can break the tips off and they stey stuck in the hole, in my humble opinion forget dyna jets they can confuse the issue, this bike runs 110hp.din. and 84ft.pds. on the dyno hope this helps, regards

Hi there mac1170 - nice selection of rides (I assume you have a McIntosh also?)!
A question or two for you - I tried running the standard airbox (with K&N filter) on my old GSX11 - similar specs to yours, but WAY non-standard cams (much more lift and duration than some Yoshi Stage II's I had been running), and 33mm Keihin CR specials - but found that the airbox was 'choking' the outer 2 carbs, causing them to run rich - REALLY rich - so I ended up going back to the K&N pods instead, which were giving me a much more even airflow (and jetting) across all carbs...
You didn't find any problems like this? Or does the later model airbox solve the problem?

 

[Guest]

Interesting fact about Dynojet versus Mikuni jets.
.9375 is the magic number.

Dynojet to Mikuni/ Dj 138x.9375=129.375 so a DJ 138 is close to a 130 mikuni

Mikuni to Dynojet/ Mikuni 130 divided by .9375 = 138.666 A mikuni 130 is close to a 138 dyno. This works throughout all ranges.

 

[Guest]

I think I found the magic combo.
132.5 Mikuni mains
50 Mikuni pilot (could stand to go to 52.5) Idles rough under 1500 rpm
3 to 3.5 turns out on the Idle mixture screw.
DJ needle bottom notch and shimmed a half.

I was bouncing the front end around at about 7000 rpms in a residential area and I think I scared the locals. :-D

 

[mac1170]

Hi there mac1170 - nice selection of rides (I assume you have a McIntosh also?)!
A question or two for you - I tried running the standard airbox (with K&N filter) on my old GSX11 - similar specs to yours, but WAY non-standard cams (much more lift and duration than some Yoshi Stage II's I had been running), and 33mm Keihin CR specials - but found that the airbox was 'choking' the outer 2 carbs, causing them to run rich - REALLY rich - so I ended up going back to the K&N pods instead, which were giving me a much more even airflow (and jetting) across all carbs...
You didn't find any problems like this? Or does the later model airbox solve the problem?

gday mate, ran the airbox with 36mmcvs of the 1150 model, not slide carbs, the later boxes have a rubber velocity stack with a duel throat, where the old one just used to be a round hole, i know on the faired version of the 1150 model suzuki actually ran 1 size larger jets on the middle two carbs, but not as rich as you reckon you were running, on the br2 mac, i run 36mm radial flatslides [mikunis], with velocity stacks, no airbox or pods, as the inside of the bodywork creates a large type of plenum chamber for the carbs to draw from, great induction sound, but keep away from dirt roads, regards.

 

[Guest]

The 50 pilot jet is rich and so is the 47.5. Going to try the stock 45 and see what happens.

 

[mac1170]

gday chef, youre needle position sounds very rich also, you may find dropping the needle back down the hole may also seem to lean out the midrange, regards.

 

[Guest]

Needle is perfect. A half a notch leaner and it was pinging on the needle circuit. It pulls the front tire right off the ground.

 

[Guest]

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