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The 2-Stroke Garage => Turning Wrenches => Topic started by: suey1958 on December 14, 2019, 06:58:24 PM

Title: Mounting Engine back on frame,...With or without top end on?
Post by: suey1958 on December 14, 2019, 06:58:24 PM
(RD350) It seems like it would be a lot easier to mount the engine without the top end on. I remember when taking mine off  it seemed awfully tight.   Just wondering which is the best way. 
Title: Re: Mounting Engine back on frame,...With or without top end on?
Post by: Jspooner on December 14, 2019, 07:06:29 PM
I do it with the cylinders on but the heads off. Put the heads on once it's in the frame.
Title: Re: Mounting Engine back on frame,...With or without top end on?
Post by: rodneya on December 14, 2019, 07:16:09 PM
When did they start making frames with the front mount that was removable?

Title: Re: Mounting Engine back on frame,...With or without top end on?
Post by: suey1958 on December 14, 2019, 07:36:55 PM
Thanks JSpooner, In that case,(On the base gasket) Do you use gasket sealer on  both sides? 
Title: Re: Mounting Engine back on frame,...With or without top end on?
Post by: pdxjim on December 14, 2019, 09:05:38 PM
I just use grease on the base gaskets so they'll come apart when you need them to later.

Base gasket is a low pressure joint, so no sealer is needed.
Title: Re: Mounting Engine back on frame,...With or without top end on?
Post by: SUPERTUNE on December 14, 2019, 10:03:02 PM
Quote from: rodneya on December 14, 2019, 07:16:09 PM
When did they start making frames with the front mount that was removable?
In '76 with the 1st RD400.
All rd 350's and earlier were fixed frame models.
Chuck
Title: Re: Mounting Engine back on frame,...With or without top end on?
Post by: Jspooner on December 14, 2019, 10:09:15 PM
Quote from: suey1958 on December 14, 2019, 07:36:55 PM
Thanks JSpooner, In that case,(On the base gasket) Do you use gasket sealer on  both sides?

No gasket sealer on base gaskets. A thin layer of grease is good tho. Helps with disassembly.
Title: Re: Mounting Engine back on frame,...With or without top end on?
Post by: suey1958 on December 15, 2019, 04:20:52 AM
Very Good, That makes perfect sense. Thanks Again   :clap:
Title: Re: Mounting Engine back on frame,...With or without top end on?
Post by: SUPERTUNE on December 16, 2019, 08:41:13 AM
Quote from: pdxjim on December 14, 2019, 09:05:38 PM
I just use grease on the base gaskets so they'll come apart when you need them to later.

Base gasket is a low pressure joint, so no sealer is needed.

My preferred way is to use 3M's Marine silicone spray on base gaskets.

(https://www.seamar.com/images/items/CRC06077.jpg)


I do glue the primary gasket to the side cover and then grease the case side as this will save from having to replace it when needing to get into the clutch.
I used the same clutch cover gasket on my F-500 racebike for like 5-6 clutch changes over the whole race season of about 20-25 races.
(in order to win...the clutch is like tires, a disposable item)