Gas Engines Questions or comments about gas engines can be posted here

Saito 300 Twin

Old 03-02-2020, 04:23 PM
Thread Starter
My Feedback: (2)
Join Date: Mar 2004
Location: Sydney, AUSTRALIA
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Default Saito 300 Twin

I have a Saito 300 Twin, single carb version, which was originally run on glow for around 3 years before being converted to gas using the Morris Mini Motors full gas kit. The engine has run well on gas for almost 2 years, but has now developed a serious problem.
The exhaust valve seats are worn out in both cylinders rendering the engine pretty much useless. There is no metal left for the valves to seal and they both drop inside the exhaust chamber in the head.
My question is does anyone have a similar experience or suggestions as to what may have caused this. Is it likely the increased head temperature of a gas engine could be to blame?
One thing I do notice is that Saito fit bronze inserts for the exhaust guide and seat on their dedicated gas engines, whereas only the guides have bronze inserts on glow engines.
I have owned and used many Saito engines over a period of 35 years, and generally have found them to be of good quality.
Any help here will be most welcome.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.