89 alternator on an 88 engine?

[manden]

My 88 alternator is fak'd. I found an 89 on the net. Anyone knows if it is a straight swap?

[fatblokeonbandit]

88 what??? 750/1100/600????

[fatblokeonbandit]

Both 750's have 30 teeth on the drive gear so are swappable, but 1100's have 28 teeth so the gear needs to be swapped, 600 teapots have 30 teeth as well, so will do a turn. depends what you have and what the one on the interweb is??????

[manden]

An 1100 88 and an 1100 89

[fatblokeonbandit]

then they should both have 28 teeth, count them to check.

You are of course, very aware of the pitfalls and how easy it is to mess up the installation of the alternator, and break the drive gear on the back of the clutch basket

[manden]

The one I pulled off the 1988 engine had 26teeth. And the "new" from the 1989 engine had 28 teeth

[manden]

[clivegto]

Swap the cogs over and be careful refitting it as FB says. 

[Dezza]

GSXR1100s: 88 = slabside; 89 = slingshot, hence the discrepancy.

[manden]

I think that the 28teeth will be better because of the lower revs. I installed the 28teeth in it with no problems. It is also smaller and lighter. There are no numbers on the 26teeth an I suspect it from being a bandit unit, but I don't know for sure.

[fatblokeonbandit]

How did the 28 tooth cog fit?? Its bigger diameter than the 26 tooth one, so will not mesh with the drive grear on the back of the clutch juts bend it and break it???  

 

Unless the problem with the alternator not working is that the 26 tooth cog was not engaing with the drive gear on the clutch, not turning and not charging.

The 88 1100 should have 28 teeth.???

 

part number for the gear on a 1100 86-88  G,H,J 

22730-06B02

	GEAR, GENERATOR DRIVEN (NT:28

 

 

1989 1100K 

22730-06B03

 

GGEAR, GENERATOR DRIVEN (NT:28

[manden]

It fitted ok actually. One was 59mm and the other 62mm. Just think the old was from a different bike. Bandit?

[clivegto]

WHAT  

[Dezza]

What clutch does the recipient engine have then? If you remove the cover to investigate it's also much easier to re-fit the alternator correctly. A clutch cover gasket is a lot cheaper than a broken gear and if you have parts in good condition (no deep scores in the mating faces) smearing the gasket with copperslip enables re-use without leakage .

[manden]

Looks like the 26teeth didn't engage as deep as the 28tteeth does. But the 26teeth alternate made it possible to take the bst40 in and out without removing the alternator