Whats up guys ive spent days looking for info on a 5 speed conversion that some dude at the socal swapmeet talked to me about and need more input maybe one of you have done it, i understand everyone has different opinions on stuff but this is for facts on the matter, can a 94+ 5 speed gearset mainshaft and trapdoor assembly bolt right into a 89 case with out pressing the drive gear out of the case? If so has any one done this with out swaping the primary and starter successfully?
Transmission 5 speed stuff
Collapse
Desktop Ad Forum Top
Collapse
Mobile ad top forum
Collapse
X
-
Tags: None
-
Thanks for the reply , my buddy did the swap from a 1989 tapered to 1990 spline but im not sure if he used the 1989 gearset and 1990 mainshaft or the while 1990 assembly and yes im talking about evo big twin with stick 5 speedsComment
-
The mainshafts are different diameters because the bearings inside the main drive gear are different. 1990 is the break year, and I think the 1990 mainshaft is unique, won't fit earlier or later years. I have never investigated the details because I have had no need to mix and match five speed parts.
JimComment
-
Pressing gearbox parts is easily done with thick allthread, large flat washers and appropriate PVC pipe or whatever's handy. (My gearbox tool bucket is buried or I'd post pics.)
If the bike is a keeper I'd ditch the entire old starter setup and swap primary covers too upgrading everything in one shot.
If the old tapered setup isn't broken I'd run it until I had the cash to replace everything. They routinely go over 100K miles like mine.
If the stock parts are damaged and money is too tight for primary covers, starter etc I could see just swapping the guts. Later is better including Twin Cam five speed donors for the internals.
You can bore the taper shaft gearbox case to fit the Denso starter but would still require the other parts. The early and later starter holes in the gearbox case are concentric and the fit is not high precision (some bikers die grind the clearance but I'd use a mill or have it done since it's so easy).
The early and late starter jack shaft locations and other features in the inner and outer primary covers differ too much to go late with those.
None of the choices is difficult work.Comment
-
Farmall thankyou for the info, im going to break it down a little more for my understanding excuse me if i sounds crazy,
Im writting this for budget builds as that what comes out of my apartment for the low income cats here in east LA that cant afford the good baker stuff,
So 1994 internals would fit in a 1989 aslong as i press the main gear out and press in the 1994 gear in and is the 1994 main gear the same outer diameter as the 1989 to fit perfect with no machining done?
Secondly iwant to try this because i have a whine coming from either my clutch basket / primary bearing or inside my transmission that i cant track there fore iwant to swap the whole thing (trans internals, clutch basket , no primary) to eliminate and not spend much on finding the issue when catostrophy happens (the bike runs amazing just sounds crazy on decel)Comment
300 mobile ad bottom forum
Collapse
Comment