Triumph Deluxe Belt Drive Crankcase Breather Kit
This kit is designed specifically to work with our belt drive kit. It includes everything you need to let your crankcase breath properly, while limiting the oily mess usually associated with other breathers.
- Heavy-duty, alloy, one-way reed valve breather
- Barbed fitting designed to screw into crankcase timing plug
- Clear tubing
- Cable Ties to clamp and secure tubes
- 1970-79 Triumph 650 and 750cc Twins, including T120/T140 Bonneville, TR6 Tiger/Trophy and TR7RV Tiger
Installation Note: Install the breather so that the direction of flow is out of the crankcase. The side with the lip on the fitting is the intake (exits reed box at 90-degree angle) The fitting exiting the back of the reed box (with no lip) is the exhaust. The can be tested by blowing into the fittings. If you blow on the end, and air passes, this is the intake. If you blow on an end, and air is blocked by the reed, this is the exhaust.
SKU MAP2088/B Manufacture MAP Cycle
- Additional Information
SKU MAP2088/B Manufacture MAP Cycle
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- Product Question
Product QuestionsI'm interested in your breather kit for my 67 engine. I understand there are multiple places you can place the nipple. What are the threads of you nipple? What is the drill and tap size recommended? My engine has the timing hole threads as 1/2 16 BSF, but the 1970 Triumph 650 has a timing hole threads of UNC 1/2 x 13 (the same as the nipple in your kit?). Thanks in advance.Question by: Greg Conner on Oct 17, 2019 8:21:00 PMOur nipple is designed to be used in the timing hole on the 1970 and later models. We haven't mounted it on other parts of the engine, but it could be done. The nipple is soft aluminum and we've found that if you put a little Teflon tape on the threads, you can screw it a few threads into timing hole on 1968 and earlier models. You don't want to force it too tight, but you can easily secure it so it won't come out. I did this without any problem on my '68 Trophy.
To answer your question, the threads on this nipple will be the same as the timing hole in 1970 and later twins - 1/2" UNC threads. I'm not sure of the drill or tap size. There are many places on these twins where you can relieve crankcase pressure. Please take a look at this article on my website:
Answer by: rick c (Admin) on Oct 18, 2019 9:32:00 AMHello. Where exactly is this breather kit installed on the engine? Do you have installation instructions?
Thanks for your time!Question by: Alec Padron on Mar 2, 2018 3:10:00 PMWe don't have any from instructions for this as it is a custom application. But the reed breather can be installed almost anywhere on the bike. You'll get the best performance by installing it as high as possible on the bike. I installed mine under the seat. If you remove the timing tool plug on the top of the crankcase under the carburetor(s), you can screw in the fitting in its place. It your engine is disassembled, the best results will be had by drilling into the empty cavity in the front of the crankcase. You would then have to tap it for the fitting. This is how many racers install their breathers.
Install the breather so that the direction of flow is out of the crankcase. The side with the lip on the fitting is the intake (exits reed box at 90-degree angle) The fitting exiting the back of the reed box (with no lip) is the exhaust. The can be tested by blowing into the fittings. If you blow on the end, and air passes, this is the intake. If you blow on an end, and air is blocked by the reed, this is the exhaust side.Answer by: rick c (Admin) on Mar 5, 2018 8:57:00 AMI am interested in this deluxe breather kit. Is the intake the timing plug? Where is the exhaust? Can the clutch area can be closed off to run dry if you stay with original clutch drive? Can you vent through the front motor mount area?Question by: James Montgomery on Jun 25, 2018 6:54:00 PMThis breather is for relieving air pressure built up in the crankcase (exhaust of air pressure). No intake is needed. If you were to remove the timing plug and start the engine, you would feel air (and usually oil) coming out of the timing plug hole.
The breather should be installed so that the direction of flow is out of the crankcase. The side with the lip on the fitting is the intake (exits reed box at 90-degree angle) The fitting exiting the back of the reed box (with no lip) is the exhaust. The can be tested by blowing into the fittings. If you blow on the end, and air passes, this is the intake. If you blow on an end, and air is blocked by the reed, this is the exhaust side.
A lot of racers and performance builders vent the engine through a nipple installed in the front motor mount area. This cavity is clean and offers the least amount of oily crankcase gas exiting from the crankcase. This must be done with the cases disassembled so debris left from drilling can be removed completely.
Using this reed breather while installing a nipple in the front of the case near the motor mount is the best way to remove built up crankcase pressure and limit the amount of oil discharge.
This kit was designed for the MAP belt drive system. Belts can be ruined by contact with oil, so the primary must be run dry. The MAP belt drive uses a special dry clutch designed for this system. This requires a special clutch basket and other modifications. The stock Triumph clutch is a wet plate system and cannot be run dry.Answer by: rick c (Admin) on Jun 26, 2018 9:19:00 AMQuestion by: Jack Delanoy on May 3, 2018 7:22:00 AMYes, you can use our breather kit even though you've removed the rotary breather. The 1966 model has a a timing tool plug on the top of the crankcase, on the right side behind the cylinder. It looks like the head of a large bolt. Our customers normally remove that bolt and replace it with a nipple that comes with our kit. This works with bikes that blow a small amount of oil. However if your bike blows a lot of oil, you might try some alternate locations. Some mechanics put more than one nipple the valve covers and T-them together, running a single hose to the breather. Some prefer to add a breather nipple to the top of the timing cover (but that doesn't look too good). If the crankcase is currently disassembled, one of the best places you can put the nipple is in the front of the crankcase. Of course, like the valve cover and the timing cover, you would have to drill a hole and tap it for the nipple. You also have to make sure all the shavings have been removed.Answer by: rick c (Admin) on May 7, 2018 10:21:00 AM
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