ARP Rod Bolts For Classic BSA & Vintage Triumph Motorcycles

ARP Rod Bolts For Classic BSA & Vintage Triumph Motorcycles

ARP Rod Bolts For Triumph & BSA Motorcycles

 

ARP Automotive Racing Products Logo ARP® (Automotive Racing Products) is a registered trademark

 

 

There has been a lot of talk recently about ARP rod bolts for vintage Triumph and vintage BSA motorcycles. In fact, we have heard it all. Some feel that ARP rod bolts are "overrated" and some feel that they are must. Although there will always be hearsay, we wanted to express our experience and opinion regarding ARP rod bolts for vintage British motorcycles. As a community, we are very lucky to have access to ARP rod bolts for our vintage Triumph, and vintage BSA motorcycles.  

 

Triumph 650 ARP Rod Bolts Image

Shown above are ARP rod bolts for Triumph 650 unit twins from 1963-1972. Comes complete with 4 rod bolts and 4 12-point nuts


Lets start with the ARP company and what they stand for. ARP stands for "Automotive Racing Products". According to there official website, they started to produce connecting rod bolts in the late 1960's due to rod bolt failure. To this day, ARP may be the only company producing "aerospace" quality rod bolts, studs, and fasteners for automobiles and motorcycles. Every component in an engine should not be over looked. Rod bolts play a crucial factor, if they fail, then the result could be catastrophic. With ARP having a deep history in racing, they really know how to keep your engine together. This allows them to match or perhaps exceed O.E.M. specifications. 

 

 

ARP Rod Bolt Stretch Gauge With Triumph ARP Rod Bolts Image

ARP rod bolt stretch gauge used to calculate the stretch to get the most accurate torque reading.  

 

ARP rod bolts use the stretch method. If you have read a Triumph or BSA factory workshop manual, you should be very familiar with this term. Stretching the rod bolts is another way of torquing the rod bolts but in a more precise way. To measure the stretch of a rod bolt, you must have a stretch bolt gauge. If you do not, you can use your torque gauge alone (refer to the ARP installation slip). When using ARP rod bolts, we highly recommend using there ARP Ultra-Torque assembly lube. This prevents galling and damage to the threads. What's great about ARP rod bolts is that they can be re-used again, but only if they are still within specification.

 

 

Vintage ARP Triumph Bonneville Rod Bolts Image

Arguably the best quality rod bolts you could install in your vintage Triumph and / or BSA motorcycle. Don't skimp out on engine parts! 

 

ARP rod bolts for vintage Triumph, and classic BSA motorcycles are made and produced on a limited basis, which means they are made in "runs" or "batches". Usually once the batch is sold and no longer unavailable, they may not ever be made again unless an investor or perhaps the market states other wise. It all comes down to supply and demand. As of now, ARP is making 3 types of rod bolts. First type are for the Triumph 650's, second type are for the BSA 650's, and the last type are for the Triumph 750's which will also fit the Triumph & BSA 250's. As you can see, ARP rod bolts will fit the most popular British motorcycles from the vintage BSA, and classic Triumph unit twins and singles. As we always say here at Classic British Spares, your British motorcycle is an investment. Don't re-use those 40+ year old stressed rod bolts. Instead, insist on ARP rod bolts that are made here in the USA and designed to last

 

Triumph 650 Specifications

Triumph 650 ARP Installation SlipClick on the image above to enlarge. Once clicked, you will also be able to print and store the file at your convenience

 

Below you will find the full specifications for ARP rod bolts when used on Triumph 650 unit twins from 1963-1972. Will also fit Triumph 500 & 650 Pre-Unit Twins up to 1962. Always use rod bolts and nuts in a complete set. Click this link purchase your Triumph 650 ARP rod bolts.

 

 

ARP Part Number:                                      206-6009  

Triumph Part Number:                         70-6576 or E6576

Torque:                                                         32 ft-lbs

Rod Bolt Diameter:                                          0.334"

Thread Pitch:                                                  24 TPI

Total Length:                                                   2.569"

Nut Type:                                                       12-Point

 

 

Triumph 250, 500, & 750 Specifications

Triumph 750 ARP Installation Slip

Click on the image above to enlarge. Once clicked, you will also be able to print and store the file at your convenience

 

Below you will find the full specifications for ARP rod bolts when used on Triumph 750 unit twins from 1973-1982. Will also fit Triumph 350 and 500 unit twins from 1957-1974 and will fit BSA B25, and Triumph TR25W Trophy models. Always use rod bolts and nuts in a complete set. Click this link purchase your Triumph 250, 500, & 750 ARP rod bolts.

 

 

ARP Part Number:                                          N/A

Triumph Part Number:                           70-9914 or E9914

Torque:                                                         32 ft-lbs

Rod Bolt Diameter:                                          0.312"

Thread Pitch:                                                  24 TPI

Total Length:                                                   2.569"

Nut Type:                                                       12-Point

 

BSA 500 & 650 Specifications

 

BSA 650 ARP Installation Image

Click on the image above to enlarge. Once clicked, you will also be able to print and store the file at your convenience

 

Below you will find the full specifications for ARP rod bolts when used on BSA A50 & A65 unit twins from 1962-1972. Will also fit BSA Pre-Unit twins with the large crankshaft journal only. Always use rod bolts and nuts in a complete set. Click this link purchase your BSA A50, & BSA A65 ARP rod bolts.

 

ARP Part Number:                                             N/A

BSA Part Number:                                   67-1536 & 67-1537

Torque:                                                           37 ft-lbs

Rod Bolt Diameter:                                           5/16"

Thread Pitch:                                                   24 TPI

Total Length:                                                    2.767"

Nut Type:                                                     6-Point Hex


1 comment

  • Wm. Hyatt

    Looking for ARP Conrod bolts. M8-1.0 X 54mm under head length, prefer “D” head.

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