Tin Type Primary

• Billet 6061-T6 aluminum inner and outer primary housings available in steel shot blasted or show polished finish
• Available in kick only and 1.4kw 1990-2006 style starter configuration
• Starter type includes jackshaft and related hardware
• Modern fine chain tooth adjuster shoe and L-bracket included
• O-ring sealed locking flanged nuts for transmission-to-inner primary studs
• Nostalgic slotted screws, gasket and related hardware included
• Zero leak drain plug with magnet standard
• Chain oiler and suction hardware included
• Inner primary is reinforced for strength around the mainshaft bore
• Works with stock style derby and inspection covers
• 2-Year limited warranty

 Benefits

• Quiet: Reduces chain noise
• Modern: Modern starter integration possible
• Clean: With redesigned parts, we have made sure that our TTP, leaks much less than the original
• Wet or Dry: Can be run dry with Shovelhead era clutches and a 1970-E84 4-speed

For Tin Type Primary Instructions: Click Here

Download Tin Type Primary Instructions: Click Here

Primary Finish Options

The TTP comes in 2 different finishes

Run it WET or DRY

Can be run dry with Shovelhead era clutches and a 1970-E84 4-speed. Chain oiler feed and return provisions are on the back side of inner primary similar to factory locations. Remove 1/8” NPT plugs and install fittings (provided). For a cleaner look with better clutch function, heat dissipation, and dependability the TTP can be run wet with primary oil with the Splined Shovel clutch in conjunction with the BAKER splined 4-speed mainshaft. Splined 4-speed mainshaft available to convert any existing 1970-E84 transmission or it can be specified in a new BAKER 4-speed build. Splined Shovel clutch is highly recommended for 93+ inch engines to avoid trouble down the road.

 

TTP Inner Primary Fittings

Inner Internal Design

Internal Design

The internal design of the Tin Type Primary has been beefed up around the mainshaft bearing with a structural web design unlike the original 1970’s inner, which is prone for breaking. Modern fine tooth chain tensioner setup ensures quiet operation along with maintaining proper chain adjustment. Keeping your primary chain lubricated is a chain oiler fitting positioned just above and rearward of the adjuster. We added O-Ring counter bore pockets around the stud holes. These O-Rings provide a leak-free sealing solution over the old silicone trick. Provided with the TTP are self-locking flanged nuts for a proper squish of the O-Rings, worry free setup.

Primary Drive Configuration Options:

• 24 tooth motor sprocket, 37 tooth clutch sprocket, and stock 82 pitch primary chain (PN 40007-36B), for a 1.54 primary ratio.
• 24 tooth motor sprocket is maximum size that fits within the TTP envelope
• 22 tooth motor sprocket, 35 tooth clutch sprocket, and 80 pitch primary chain (available through BAKER) for a 1.59 primary reduction. 35 tooth clutch sprocket available with BAKER splined Shovel clutch.
• 23 tooth motor sprocket, 38 tooth clutch sprocket, and stock 82 pitch primary chain (PN 40007-36B) for a 1.65 reduction. 38 tooth clutch sprocket available with BAKER splined Shovel clutch.

BAKER Highly Recommends

The use of a Harley ‘H-D’ 1.4kw starter for proper operation. If you are running the stock Shovelhead clutch double check the ring gear for wear. These were a 3-piece design that were riveted together and were prone for ring getting worn on the inside. Replace with a 1-piece ring gear, weld on finding in your local distributor catalog.

TTP Fitment / Compatible With:

• 1970-E84 Big Twins and custom 4-speed builds
• 1970-79 ratchet top 4-speeds (top or bottom pull)
• 1980-E84 turtle top 4-speeds (non-starter TTP version only)
• Jockey top 4-Speeds
• BAKER 4-Speed
• BAKER 6-INTO-4
• BAKER TTP-200A, Clutch release arm kit
• Alternator style motor cases
• Shovelhead clutches and BAKER splined clutch
• 1990-2006 1.4kw H-D starters with ¼-20 or 10-32 shaft
• Traditional tin derby and inspection covers or BAKER TTP covers
• 1955-64 splined non-compensator motor sprockets
• Stock 40007-36B primary chains
• TTP is not compatible with Factory Mid Controls

TTP Part Numbers for the old style BAKER 6N4 Transmission with the .983” diameter mainshaft:

TTP Part Numbers for 4-Speed & BAKER 6N4 Transmissions with the 1.000” diameter mainshaft:

TTP bearing & seal placement for the current, 1.000” diameter and .983” diameter mainshafts:

4-SPEED AND NEW STYLE 6N4 W/ 1.000” MAINSHAFT PN R16DDUCE, BEARING / PN 200 RRRI, SNAP RING / PN 56-5101, SEAL

OLD 6N4 W/ .983” MAINSHAFT PN 16005, BEARING / PN 56-1068A, ADAPTER SLEEVE / NO SNAP RING / PN 56-5101 SEAL

Note:

The old style 6N4 with .983″ diameter mainshaft does not use a snap ring to retain the race adapter and bearing. The seal is pressed directly on top of the bearing for clearance for the older style bottle gear assembly on the transmission. See the below images for mainshaft identification; old VS new:

Old .983” & Current 1.000” diameter mainshaft images:

.983″ STEPPED Mainshaft Installed On Transmission PN 996040-8

.983″ Stepped Shaft With 1.000″ Mainshaft Side By Side Comparison

Note:

We had a couple part numbers for the stepped .983″ mainshaft; PN 996040-8 & PN 6N4-70xxxx. (xxxx= month / year). The last stepped .983″ mainshaft were made in 2008 (PN 6N4-70xx08).

Cover Kits

Clutch Cable Kit TTP-200A

Notes

Kit PN TTP-200A is needed in order to run your stock style clutch cable setup, features a 10 degree release arm to clear a modern starter along with a clutch cable extension ferrule, so no modification to your stock setup is necessary.

Recommended Upgrades

• BAKER 4-Speed Transmission
• BAKER 6 INTO 4 Transmission
• The Splined Shovel Clutch highly recommended for Big Horsepower applications and durability