hammer 1250 with stock 883 heads

The stock 883 heads are reused as-is. If they have a lot of miles on them, you may consider a valve job and new valve guide seals. Either a 1250 kit or 1275 kit is used, and is configured with reverse dome conversion pistons to give 10:1 compression with the stock 883 heads. You should stay at 10:1 or less when using stock cams and pump gas

One of the big advantages to using 883 heads on a 1200 or 1250 conversion, as opposed to the 88-03 1200 heads, is that when you put the 883 chamber over a 3.498 diameter bore, you gain a 1/4 squish band around the perimeter of the chamber

Mar 22, 2013 If doing it in stages doing the 1250 on stock 883 heads is a waste because as soon as you upgrade the head you also need different pistons. I would suggest finding a set of 04 and later 1200/ XB heads (both are the same) as they are the highest flowing OEM head out there. you dont need to do cams right away but you can

Jan 21, 2019 Stock 1200 heads in blue, stock 883 heads in red HAMMER 1250 kit (http://www.hammerperf.com/xlbigborekits.shtml#1250kits) with flat top 1250 pistons in blue, reverse dome 1250 pistons in red (both configurations have a 10:1 compression ratio) Stock W cams Patriot Defender exhaust

Can not run stock 883 cylinder heads with this kit. The cylinder fin profile does not perfectly match the fins on 2004 and later stock heads, but the difference is not considered to be objectionable. See Photos. S&S does not recommend boring 2004 and later 883cc cylinders from 3 to 3-9/16 bore to increase engine displacement to 1250cc due to

Here's what a 1250 brings to a late model EFI 883. This motor has stock EFI 883 heads and W cams. In blue is a 1250 kit with reverse dome conversion pistons and stage 1 mods (exhaust, air cleaner, tuner) In green is the stock XL883. Click here for more information on converting your 883

Nov 18, 2015 Narrowed down between a basic 1250 Hammer kit(minus the Dynojet Powervision) and the HD 29784-07 1200 kit w/heads. I see where the Hammer would have stronger cylinders but this build won't be beat on. What has me on the fence is the new 1200 heads that come with the HD kit. This would yield better flow over stock 883 heads, more displacement

Feb 27, 2014 Note – Not recommended for engines with stock 883 heads, but works great with stock 1200 heads and 883 or 1200 heads CNC ported by S&S. S&S 1250cc Big Bore Kits for 1986-2014 Harley-Davidson

Apr 05, 2012 Sending your 883 heads to either NRHS or Hammer and you will get a much better product than those S&S heads I'm probably going to go with your advice. Other than intake/exhaust, porting, larger cams, stronger springs, and fitting push rods, what are a few things I could do to get a stronger more reliable bike?

Mar 19, 2013 So im trying to get the money up for the Hammer 1250 kit for my 99 XL883c. ... A 2003 and older 1200 would be MUCH slower than your bike with a 1250 kit in it. I recently did a 1250 kit on a 1998 883 using stock heads, cams, carb, ignititon, etc and made 69 hp at the rear wheel. By comparison a 2003 and under 1200 makes about 50-55

Original Price: $929.95. The Revolution Performance Velocity CNC Cylinder Head Package was developed on the flow bench, dyno and street to increase power and torque on 883 cc and 1250 cc engines. These heads flow much better than stock, with our focus on port velocity we have created heads for better overall power and ride-ability

Feb 18, 2009 The 883 has a 3 cylinder bore, smaller combustion chambers & valves in the heads - the 1200 has a 3.5 cylinder bore, but the same bottom end, cams, etc. Stock 883 cylinders can be bored out to 1200 size, so you don't even have to buy new cylinders. 1200 heads will bolt on an 883 & vice-versa

Mar 10, 2017 Plan on a pro shop build if you're not a wrench, and it will last a long time. 1200 or 1250cc is a moot point as good heads, matched cams, proper exhaust and a good dyno tune can make either perform very well. Your 883/1200/1250 will fly! Hammer rules

May 14, 2018 The maximum valve lift they can safely support with stock hardware is .500 . They can be interchanged with 2004-2006 heads except that a new front head mount bracket is required. A bracket designed to put a 2004 or newer head onto a 1991-2003 bike is readily available from HAMMER PERFORMANCE

This kit lets you take your 883 Sportster out to 1250cc with. Give it a read here. It lays out what you need for anywhere from a basic conversion. BOLT-ON 1250 Kits. 1250 Kit Options. They give a 10:1 compression ratio

Feb 26, 2014 1250 cc is more than double the horsepower of a factory 883 Sportster! The kit is the largest big bore kit S&S offers for 1986-’14 Harley-Davidson Sportster models that can be bolted directly into stock crankcases. It includes 3-9/16” bore pistons, cylinders, and gaskets

4 interest-free payments of $299.75 with Klarna. Make your Iron 883 ™ roar. This complete conversion kit will alter the personality of your 883-equipped Sportster model. Designed to bring your XL883 model up to XL1200 specifications. roar

Lube the threads, shanks, and undersides of the heads on the head bolts and install finger tight. Torque in the order shown in your service manual. For multi-layer steel gaskets, torque all head bolts to 9ft-lbs, then 14, 22, 35, and finally 42ft-lbs. For composition type gaskets, follow the

Hi all, Just had my 1250 Hammer kit installed the other week. I've got a thread elsewhere on this conversion but thought I'd share some info here on my build as a couple of guys have asked about it. - Hammer Performance 1250 kit iron-lined with Sledge Hammer 30 deg reverse dome pistons (10.5:1) - Hammer Performance