Those 1200 heads shown in the video are the early ones with the big 67cc "Hemi" combustion chambers. The '04 up 1200 heads have pear shaped 62cc chambers, bigger 1.81"/1.575" valves, and better ports. They are functionally identical to the Buell "XB" heads. The '04-up and XB heads are better performing than the earlier heads by a good bit.
Nice video mate. We just put in a 1.86 intake valve in my 883 head. With high compression pistons that's about as big as they can be in that little head. We had alot of problems with clearance 🤪
+Hampus Bergman Hello Hampus and thank you for watching and your comments! I would highly recommend the investment into a Hammer Performance Kit! For me it was really kind of a game changer in the way I viewed Harley Sportsters and my enthusiasm toward building and riding! Thanks again and good luck with your dreams!
Your videos are "eye openers" for me. I knew there were ways to mod Sportster engines but I've never seen anything like this. I've seen things done like this to cars and I knew it could be done to Harleys.
Hey Jeff! One thing about Harley's is that they are a great building blocks for custom performance builds. Like many other vehicles, there are many different performance options to consider. That is one of the reasons people like HD's so much because they can build them to their own liking!
Hi mate. How about a Video on what heads or bumps in size can go on what sportsters. What are the options you think would suit the later 2017 onwards type roadsters and other such twin disc machines.
Hey, great video. I'm looking at a set of assembled 883 heads and cylinders on the cheap. I know i can get the cylinders bored out but can they convert the 883 heads to take the larger valves or anything? Very curious, cant find anything about head conversions.
I have a 1250 kit with a cam and solid lifters and decompression valves for easy starting, bought bike thus way with not much info on build cause it came from a estate sale. Bike has cv40 carb with 48 pilot and 185 main. Seem to be running lean from looking at plugs and it back fires at low speed . Should I bump up the pilot to a 50 and main to a 190. Bike has no gasket leaks. Bike also has inverted front forks an aluminum swingarm, dual brembo front breaks and rear and a baker 6 speed so I'm thinking no money was spared for motor build.
It’s weird seeing the difference in size when the 883 heads can work with a 1200 conversion. Seems like I’m gonna lose power using the 883 heads (starting the tear down of my bike Sunday to do a 1200 conversion). What do you think?
Hello Joel and thanks for your comments! I think the stock Buell head would be have a higher flow and HP rating than the standard XL1200 head. Overall the Buell's had more HP's than the stock XL1200 by about 20 to 30 percent more. Thanks again!!!
@@benjimancorbin5751 You can, but you'll need dished pistons. The flat top 1200 pistons with the small 883 chambers will bring the compression up way too high.
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Those 1200 heads shown in the video are the early ones with the big 67cc "Hemi" combustion chambers. The '04 up 1200 heads have pear shaped 62cc chambers, bigger 1.81"/1.575" valves, and better ports. They are functionally identical to the Buell "XB" heads. The '04-up and XB heads are better performing than the earlier heads by a good bit.
Nice video mate. We just put in a 1.86 intake valve in my 883 head. With high compression pistons that's about as big as they can be in that little head. We had alot of problems with clearance 🤪
Nice the 1200 head motor will
Be nice combo
Thanks for these videos! Very interesting. Im thinking about getting a hammer performance kit in the future. :)
+Hampus Bergman Hello Hampus and thank you for watching and your comments! I would highly recommend the investment into a Hammer Performance Kit! For me it was really kind of a game changer in the way I viewed Harley Sportsters and my enthusiasm toward building and riding! Thanks again and good luck with your dreams!
Your videos are "eye openers" for me. I knew there were ways to mod Sportster engines but I've never seen anything like this. I've seen things done like this to cars and I knew it could be done to Harleys.
Hey Jeff! One thing about Harley's is that they are a great building blocks for custom performance builds. Like many other vehicles, there are many different performance options to consider. That is one of the reasons people like HD's so much because they can build them to their own liking!
Hi mate. How about a Video on what heads or bumps in size can go on what sportsters. What are the options you think would suit the later 2017 onwards type roadsters and other such twin disc machines.
Hey, great video. I'm looking at a set of assembled 883 heads and cylinders on the cheap. I know i can get the cylinders bored out but can they convert the 883 heads to take the larger valves or anything? Very curious, cant find anything about head conversions.
I am pretty sure Hammer Performance will tell you the stock 883 head gives the highest compression but is let down by valve size.
Are used the wise go conversion pistons 4 and 832 or 1200 years and 883 heads worked very well still works very well
I have a 1250 kit with a cam and solid lifters and decompression valves for easy starting, bought bike thus way with not much info on build cause it came from a estate sale. Bike has cv40 carb with 48 pilot and 185 main. Seem to be running lean from looking at plugs and it back fires at low speed . Should I bump up the pilot to a 50 and main to a 190. Bike has no gasket leaks. Bike also has inverted front forks an aluminum swingarm, dual brembo front breaks and rear and a baker 6 speed so I'm thinking no money was spared for motor build.
It is hard to tell you what to do from here without being with the bike.
Sounds like you hit the Jackpot on that Auction 👍🍺
It’s weird seeing the difference in size when the 883 heads can work with a 1200 conversion. Seems like I’m gonna lose power using the 883 heads (starting the tear down of my bike Sunday to do a 1200 conversion). What do you think?
Do you have to run a oil cooler on the 1470
how does the stock buell has compare to the 1200xl head?? great video though.
Hello Joel and thanks for your comments! I think the stock Buell head would be have a higher flow and HP rating than the standard XL1200 head. Overall the Buell's had more HP's than the stock XL1200 by about 20 to 30 percent more. Thanks again!!!
Thats why i am looking for some buell heads for my 1200 sportster dragbike :)
Those buell heads will work 👊
I would love a 90ci on my 2001 883.
It is really nice.
Can a person use the stock heads on a 2005 xl883c to do a 1200 converaion?
Hey Ben I believe that you can use the 883 heads on the 1200 conversion.
@@motorcycleridingandrepair1627 but can I use the heads on used stock 1200 cylinders?
I think that you could if you want to. The bolt pattern is the same.
Thank u sir
@@benjimancorbin5751 You can, but you'll need dished pistons. The flat top 1200 pistons with the small 883 chambers will bring the compression up way too high.
What was the Dyno numbers on the 90ci?
Hello Jason! It was around 108 HP.
I put together a 90ci that made 105hp and 104lbs tq. I was trying to upload a picture, but couldn’t paste it.
@@jasonmcmillian4076 Our motors sound about the same then. The differences could be in the Dyno's.
Why not compare the NRHS stage 3 heads?
I did not have a set of the NRHS heads to compare Todd.
Interesting
Thank you moviebod!!
When you think a Velocette Thruxton 500 has a 2" inlet on a 3.39" (86 mm) bore
I didn't know hammer did anything over 1275!!!
Hey Kris. Yes they do varied other size depending on XL or FX. They do 88 and 90 Inch XL's and varied big bike motors. See their site.
Hey Kris. Yes they do varied other size depending on XL or FX. They do 88 and 90 Inch XL's and varied big bike motors. See their site.
What service did you use to get it to 1470? I'm planning to go with a 90+hp package to hang with the big dogs.
Never mind that last one. Heard in the video after that you used 90ci service.
Hi Squid! I used Hammer Performance do the top end on the 1470 and Darkhorse do the bottom end.