1250 upgrade question
#51
01-31-2007, 11:24 PM
RE: 1250 upgrade question
The 883 has different transmission gears than the 1200 due to the lesser horsepower. When you do the conversion you'll have 1200cc with 883 gearing which will get you from A to B post haste. I considered changing the drive sproket but for 1 tooth difference it wasn't worth it.
Piginablanket,
Someone said to save your money and do all the work at once. That is actually very good advice. That way you use a combination that works well with each other. You won't have to pay for components twice that need to be replaced. On top of that you won't have to pay labor twice. Building an engine in two stages is actually a less reliable and much more expensive process. Think about if you will be happy with a 1250 kit with chamber relief work or if you want a stage 2 engine.
A stage 2 engine is nice, but it probably will result in 90 rwhp. You have to decide if the extra money for the stage 2 is worth all the extra money.
#52
01-31-2007, 11:32 PM
RE: 1250 upgrade question
But, we all need to do what's best for our individual budgets and priorities. PIB - you're doing the smartest thing by starting off 1250. That's the best building block for our bikes (IMO), anything else can be done later. If you can swing theheads now... go for it so you're not paying labor twice. Damn, I wish I started off w/ that 1250kit instead of 1200... you're making me jealous.
#53
01-31-2007, 11:40 PM
RE: 1250 upgrade question
Hmm I am almost positiveI would be happy with that chamber relief work and the .536 cam. If later I decide to get a stage 2 I can just replace the heads and that should be it right?
Don't be jealous XL OCD you are already riding around with your kit installed and you have stage 2 heads also so at least you are enjoying your fast bike now whileI can only dream and post about it for now. [
]
Don't be jealous XL OCD you are already riding around with your kit installed and you have stage 2 heads also so at least you are enjoying your fast bike now whileI can only dream and post about it for now. [
]
#54
01-31-2007, 11:50 PM
RE: 1250 upgrade question
Actually the difference is more than the transmission Sprocket, in the Primary Drive, the Engine Sprocket is 34 teeth on the 883 and 38 teeth on the 1200, and theFinal Drive the TrannySprocket is 28 on the 883 and 29 for the 1200, the rear wheel is 68 for both and the Clutch is 57 teeth for both.
ORIGINAL: 1200c
The transmission on the 883 and 1200 is 100% the same. I just checked part numbers and all models use the same transmission gears. The difference is in the sprocket that results in higher rpm for the 883's. Also, I think the clutch spring is weaker on the 883's than the 1200's. Other than that there should be no difference.
Piginablanket,
Someone said to save your money and do all the work at once. That is actually very good advice. That way you use a combination that works well with each other. You won't have to pay for components twice that need to be replaced. On top of that you won't have to pay labor twice. Building an engine in two stages is actually a less reliable and much more expensive process. Think about if you will be happy with a 1250 kit with chamber relief work or if you want a stage 2 engine.
A stage 2 engine is nice, but it probably will result in 90 rwhp. You have to decide if the extra money for the stage 2 is worth all the extra money.
The 883 has different transmission gears than the 1200 due to the lesser horsepower. When you do the conversion you'll have 1200cc with 883 gearing which will get you from A to B post haste. I considered changing the drive sproket but for 1 tooth difference it wasn't worth it.
Piginablanket,
Someone said to save your money and do all the work at once. That is actually very good advice. That way you use a combination that works well with each other. You won't have to pay for components twice that need to be replaced. On top of that you won't have to pay labor twice. Building an engine in two stages is actually a less reliable and much more expensive process. Think about if you will be happy with a 1250 kit with chamber relief work or if you want a stage 2 engine.
A stage 2 engine is nice, but it probably will result in 90 rwhp. You have to decide if the extra money for the stage 2 is worth all the extra money.
#55
02-01-2007, 12:38 AM
RE: 1250 upgrade question
Hmm I am almost positive I would be happy with that chamber relief work and the .536 cam. If later I decide to get a stage 2 I can just replace the heads and that should be it right?
Actually the difference is more than the transmission Sprocket, in the Primary Drive, the Engine Sprocket is 34 teeth on the 883 and 38 teeth on the 1200, and theFinal Drive the Tranny Sprocket is 28 on the 883 and 29 for the 1200, the rear wheel is 68 for both and the Clutch is 57 teeth for both.
#56
02-02-2007, 03:23 AM
RE: 1250 upgrade question
Well I got an email back from NRHS today and they said the cost would be about $1300. They also said they didn't have any 04 and up 883 heads but they had some 03 and older heads ifI wanted to use those.
Are there any differences in the 883 03 and 05 heads that anyone knows about? Do you think it would be ok just to use the03 heads and have them chamber relieved and valve work done? If they are virtually the same with no performance differences then I don't see why I shouldn't use them.
Are there any differences in the 883 03 and 05 heads that anyone knows about? Do you think it would be ok just to use the03 heads and have them chamber relieved and valve work done? If they are virtually the same with no performance differences then I don't see why I shouldn't use them.
#58
02-02-2007, 11:44 AM
Road Master
RE: 1250 upgrade question
I think the 883 heads are the same from about90 to 2006.
When Harley warped one of my 1991 heads during the 1200 conversion, they later replaced it with a new, stripped 883 head. The tech told me they were all the same, barring minor tolerance difference. My valves were rather loud on this head at first, yet they are seating ok now after 450 mile.
When Harley warped one of my 1991 heads during the 1200 conversion, they later replaced it with a new, stripped 883 head. The tech told me they were all the same, barring minor tolerance difference. My valves were rather loud on this head at first, yet they are seating ok now after 450 mile.
#59
02-02-2007, 02:33 PM
RE: 1250 upgrade question
Well I got an email back from NRHS today and they said the cost would be about $1300. They also said they didn't have any 04 and up 883 heads but they had some 03 and older heads if I wanted to use those.
Are there any differences in the 883 03 and 05 heads that anyone knows about? Do you think it would be ok just to use the 03 heads and have them chamber relieved and valve work done? If they are virtually the same with no performance differences then I don't see why I shouldn't use them.
Are there any differences in the 883 03 and 05 heads that anyone knows about? Do you think it would be ok just to use the 03 heads and have them chamber relieved and valve work done? If they are virtually the same with no performance differences then I don't see why I shouldn't use them.
Doesn't NRHS have a 95 inch kit for the Sportster now, Anyone tried it???
#60
02-03-2007, 07:46 PM
RE: 1250 upgrade question
Ok, I am back from springfield. I have looked at my parts manual and the 883 heads have an extension of -04, meaning they were introduced in 2004. That means that there is something DIFFERENT from the older 883 heads. I'm not 100% sure about all the differences, but the solidmount and rubbermount heads are different. The one difference that I can find is the valvetrain. The 883's have the same valve train as the 1200's that was inherited from the buells. So 7MM valves instead of 5/16 and much better springs than the past ones. That valve train is good up to 7K rpm. The springs in there are also able to handle more aggressive cams. For example, in the past you would have to change the springs when using .536 cams. With the rubbermount valve train you can put in .536 cams without having to swap those parts out.
It's up to you what you want to do.
It's up to you what you want to do.