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Old 04-23-2011, 08:24 PM   #1
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Local Bandit 1200 head engine work?

I am starting to think/plan steps for a mild build up of the 1200 this winter. I think the bike is more or less done for the summer. I got the 1200 in, got the wider rear tire on and just got the carbs back together after getting a 24 hour bath to make them spotless. took her our for a quick ride ( errands mostly ) and it it running like silk.

My quick list for the rest of the summer is

1. better brake pads are coming real soon.
2. the stock rear shock has both preload and rebound adjustments, but I have been talking to a guy that revalves the stock shock for better performance.
3. the front forks will be getting race tech springs + custom preload adjusters ( they currently have rebound )

this will be done most likely by October.

Now for the engine build up, I have a few ideas ( Cams for sure, P&P on the head, Maybe a 1216?... I would like a solid 130+ rear hp. 150+ would be great, 170 would be dreaming and not to realistic to drive every day. I cannot locate standard bore high compression pistons, but I can find 1216/1246 kits all day long.

so has anyone here installed a 1216/46 on a bandit 1200? who would you trust to perform head work and engine work ( and do they have experience with the old oil cooled Suzuki's? and being that I have never taken a head to get work what would the cost be to match the intake ports to the runners, polish/clean it all up and a basic/mild valve job?

I may do it in sections as well. I.E. this winter take the head off and get that done the way I want then the following year do the block. Is this doable? or should it all be done as one unit?

TIA!
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Old 04-23-2011, 08:25 PM   #2
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Old 04-23-2011, 08:35 PM   #3
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got to wait till winter for engine build pics. the swap and rear builds were posted before
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Old 04-24-2011, 09:30 AM   #4
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Old 04-25-2011, 05:17 AM   #5
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I've done quite a few GSXR1100 / Bandit 1200 cylinder heads.
Give me a call Tuesday amd we can talk about your options.
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Old 04-25-2011, 08:11 PM   #6
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1216 kit would be good, as well as head work, a nice set of megacycle cams and 38mm Mikuni Flat slides......

Lots of good places to get the head done, just none around here that I know of...... Your best local option would probably be Klaus Speedworks. He used to build/blue print Factory Suzuki Team race engines back in the 80s/90s and even some Yoshimura heads.... Andy at Metric Cycles is also real good on heads, particularly valve jobs etc but I am not sure how he does on porting....Not sure if he has a flow bench.

Personally, I would send the head to Star Racing, Cope Racing, Lazer Porting, Freedom Motorsports (Vance & Hines). Lastly and definitely not least, I am sure Carpenter Racing would still do handy work on an old oil boiler head.

A mild compression (11-1) 1216, GOOD head work (31x26), cams and flatslides with a good pipe should make 150-160 rwhp, still be very reliable and not run too hot..... I would do an auxillary oil cooler as well....

If you really want to get nasty, a 13.5-1 1277cc or better yet, stroke it to 1340cc, full race port job and some big cams, FCR 41mm carbs and make 180rwhp.....

Pick your poison, bring all your credit cards....you'll need em...
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Old 04-25-2011, 08:13 PM   #7
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I just read Patrick's post, hit him up first and see what he has in mind....
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Old 04-25-2011, 08:25 PM   #8
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Ya I'm going to call tomorrow. Thanks zxalan. I don't want to go crazy. Its a DD. And want to keep it that way while making it pound the pavement a bit more.

I am running a Katana 750 cooler Witch is larger then the stock bandits. But I also have fkull bodywork and a stock bandit does not. So heat may be an issue

I would like to stick with stock carbs. I have seen full Turbo kits to NOS to 1340cc kits. That
is why I like this motor, LOTS
of options.

I am also thinking good cams and gsxr 750 head (88-89 or pre Katana750) may get me to 130 rwhp

Last edited by ST675; 04-25-2011 at 08:27 PM.
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Old 04-25-2011, 08:36 PM   #9
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Quote:
Originally Posted by ST675 View Post
Ya I'm going to call tomorrow. Thanks zxalan. I don't want to go crazy. Its a DD. And want to keep it that way while making it pound the pavement a bit more.

I am running a Katana 750 cooler Witch is larger then the stock bandits. But I also have fkull bodywork and a stock bandit does not. So heat may be an issue

I would like to stick with stock carbs. I have seen full Turbo kits to NOS to 1340cc kits. That
is why I like this motor, LOTS
of options.

I am also thinking good cams and gsxr 750 head (88-89 or pre Katana750) may get me to 130 rwhp

750 heads have smaller valves, plus if its pre 91, it will be an adjustable rocker arm style setup which sux, they don't hold a valve adjustment for . You could use a GSXR1100 head but.... you might as well keep the bandit head. Dale Walker is also pretty good on the oil boiler stuff.... I am not sure if he flows his heads but he makes pretty decent power for STREET bikes....he is a bandit afficionado...Worth looking into it but he is $$....

http://www.holeshot.com/bandit/

I have dealt with him a few times, he is pretty sharp, kind of crusty at times but....honest and knowledgeable....has a pretty significant racing career.


I like your bike, I always liked the comfort of Katanas but always disappointed with their engines.... I think a reliable 1216 in a katana would be a great daily rider combo. Definitely run the auxiliary oil cooler or atleast put a fan on your stock cooler. You'll be boiling that oil in a bad traffic jam and that is no fun....
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Old 04-26-2011, 06:59 AM   #10
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A 1216 kit with head work, GSXR1100 cams degreed for mid range, a good pipe and the stock carbs with dual air filters and a jet kit is good for the 130-135 rwhp range.
The stock carbs have issues, especially the pilot circuit, but if it's a dd you may not have to deal with them.
If you want to dd a set of 39 FCR's with pods and some mild cams and you can hit 140ish on pump gas. The 38 Mikunis have a heavy throttle pull because of the required heavy return spring. The FCR carbs don't because of the slide rollers. If you're going to change carbs I'd go with the FCR's. 39mm for street use will keep good throttle response.

There's nothing wrong with the rocker style heads, just make sure both valves on the rocker are adjusted to the same clearance. The 2 main causes of rocker wear and inconsistent clearance are improperly adjusted valves causing the rocker to twist and not enough top end oil pressure causing the rockers and shafts to wear.
I don't like the '91-'92 shim style, they liked to spit shims. Granted you can add a shim under bucket conversion but they're expensive if you can still find one.
Add a top end oiler kit and you'll minimize rocker shaft wear and I'd recommend a good quality synthetic oil.
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Old 04-26-2011, 08:50 AM   #11
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I was reading up on the 750 head ( slingshot / DOT head ) and from what I have read, most agree that on the bandit motor it's about a 15 hp gain by bolting the head on. The CR gets bumped up, intake ports are a bit better, and ( I could be wrong, it happened once or twice LOL ) but the valve sizes should be the same between the slingshot/bandit/GSX1100 etc. 28.3mm intake and 25 exhaust is this wrong info?

And I guess one of the main benefits from doing a 1216 would be a nice bump in the TQ department as well.

I Have holeshot Stage 2 jet kit with pods on right now. 150 mains, 35 pilot and 2 brothers carbon muffler.

A top end oiler kit ( currently ) is out of the question. The Katana frame covers some of the bolt locations that is required for the top end oiler kit.

Changing carbs would be only if necessary, if the stockers start choking the motor. Plus I can't go to tall, height is an issue all around with the 1200 in the 750 frame. and I have to raise the rear of the tank already, just a bit, to keep the petcock from hitting the top of the carbs.

Quote:
I like your bike, I always liked the comfort of Katanas but always disappointed with their engines....
Yup, I love the wind protection and the seating position. The longest I have ridden her has been ~7 hours with a 30 min lunch break in between. When I was done I did not hurt one bit. The 750 wasn't bad but its a heavy bike and definitely needed more of a push behind her.

And thanks for all the input so far patrick/ZXALAN, its always great to read from others who know way more then you do

quick cam reference info I have been using.
liftdurations
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Old 04-27-2011, 01:37 AM   #12
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I added an oil temp gauge to my old Bandit just to keep an eye on it. Patrick is spot on for the 130-135 hp range with simple bolt ons.

Keep in mind you get to making big power and you'll have a flexi flyer with the Katana frame.

Me? I'd spend the $$ on the suspension, maybe even a USD front conversion, and do the cam and heads and a slight compression increase and then ride the outta it.

My Bandit was setup the same as yours with full exhaust and Stage 2 jetting/K&Ns, and did 118 on the dyno. Never had any issue keeping up.

Patrick knows his Bandits.. he has a very nice one his self..
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